Question 3 :
Human body has trillions of cells, here a trillion means _________.
Question 4 :
Nucleus is separated from the cytoplasm by a membrane called the _____________.
Question 7 :
Fill in the blanks. The outermost layer of plant cells is the (a) _______ beneath which is the (b)______ . The term (c)_______ refers to the jelly-like substance containing all the (d)______ . The (e)_______ contains thread-like structures called (f)________ .
Question 8 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04bf59b460d7261f2c1.PNG' />
In the above image two columns are shown. Match column I with column II.
Question 9 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04df59b460d7261f2c3.PNG' />
The cell shown in the above image represents
Question 10 :
Fill in the blanks. The outermost layer of plant cells is the (a) _______ beneath which is the (b)______ . The term (c)_______ refers to the jelly-like substance containing all the (d)______ . The (e)_______ contains thread-like structures called (f)________ .
Question 13 :
The change in shape of amoeba is due to formation of pseudopodia which facilitates movement and help ___________.
Question 14 :
The cells having well-organised nucleus with a nuclear membrane are designated as ________.
Question 15 :
Which of the following feature will help you in distinguishing a plant cell from an animal cell?
Question 16 :
The unit of measurement used for expressing dimension (size) of cells is
Question 18 :
An organism with billions of cells begins life as ______ which is the fertilised egg.
Question 20 :
Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
Question 23 :
The entire content of a living cell is known as _________
Question 24 :
Amoeba has no definite shape, unlike other organisms. They has projections of varying lengths protruding out of its body that keeps on changing. These are called _______.
Question 28 :
In leaves, name the pigment that is responsible for green colour
Question 29 :
State True or False for the following statement:-
Vacuoles in animal cells are much smaller.
Question 33 :
The cells having nuclear material without nuclear membrane are termed ______.
Question 35 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04cf59b460d7261f2c2.PNG' />
The cell shown in the above image represents
Question 38 :
Give example of a cell that helps to receive and transfer messages to our body system.
Question 39 :
Various other components, or organelles, of cells are present in the cytoplasm. These are _______
Question 40 :
Human body has trillions of cells, here a trillion means _________.
Question 41 :
In leaves, name the cell organelle that is responsible for green colour
Question 47 :
State TRUE or FALSE: Gene controls the transfer of a hereditary characteristic from parents to offspring.
Question 50 :
The jelly-like substance between the nucleus and the cell membrane is called ___________.
Question 51 :
A coating of zinc is provided to protect iron from corrosion and rust.
Question 52 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.
Question 53 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ef59b460d7261f2d9.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 54 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 55 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d056f59b460d7261f2cf.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate A?
Question 56 :
A coating of zinc is provided to protect iron from corrosion and rust.
Question 57 :
Small amount of a mineral salt present naturally in water makes it a ____________ of electricity.
Question 58 :
Which of the following metals is used in electroplating to make objects appear shining?
Question 59 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 60 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d2.PNG' />
In the above image, which of the following solutions will not make the bulb glow?
Question 62 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c8.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. Why did the bulb not glow in A?
Question 64 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d053f59b460d7261f2cb.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?
Question 65 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d053f59b460d7261f2cb.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?
Question 67 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c7.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does air never conduct electricity?
Question 68 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d059f59b460d7261f2d3.PNG' />
From the above image, we can see that Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B. They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
Question 69 :
Small amount of a mineral salt present naturally in water makes it a ____________ of electricity.
Question 70 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 71 :
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
Question 72 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d056f59b460d7261f2cf.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate A?
Question 73 :
Electroplating of ______________ is done on objects like water taps and cycle bell to give them a shiny appearance.
Question 74 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d6.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 75 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 76 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?
Question 79 :
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
Question 81 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d6.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 82 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c8.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. Why did the bulb not glow in A?
Question 84 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d055f59b460d7261f2ce.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What does the deflection in magnetic compass indicate?
Question 85 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d054f59b460d7261f2cd.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate B?
Question 86 :
One of the most common applications of chemical effect of electric current is __________.
Question 87 :
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
Question 88 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d054f59b460d7261f2cd.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate B?
Question 89 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.
Question 91 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ef59b460d7261f2d9.PNG' />
In the image above, will the bulb glow. Write ‘Yes’ or ‘No’
Question 92 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d2.PNG' />
In the above image, which of the following solutions will not make the bulb glow?
Question 93 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d1.PNG' />
Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity?
Question 94 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d051f59b460d7261f2c9.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What will be observed if the number of cells are increased in the circuit shown in B?
Question 95 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' />
In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?
Question 96 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d051f59b460d7261f2c9.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What will be observed if the number of cells are increased in the circuit shown in B?
Question 97 :
Which of the following metals is used in electroplating to make objects appear shining?
Question 98 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d059f59b460d7261f2d3.PNG' />
From the above image, we can see that Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B. They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
Question 99 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d055f59b460d7261f2ce.PNG' />
In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What does the deflection in magnetic compass indicate?
Question 100 :
One of the most common applications of chemical effect of electric current is __________.
Question 103 :
True or False. $CO_2$ not only forms a blanket around the fire, it also brings down the temperature of the fuel.
Question 104 :
State TRUE or FALSE: Water vapours surround the combustible material, helping in cutting off the supply of air. So, the fire is extinguished.
Question 109 :
What product is obtained when charcoal or coal burns in air?
Question 112 :
The chemical process in which a substance reacts with oxygen to give off heat is called as?
Question 114 :
Increased concentration of carbon dioxide in the air is believed to cause ____
Question 117 :
The calorific values of petrol and CNG are 45000 kJ/kg and 50,000 kJ/kg, respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer, why?
Question 119 :
Small pieces of pinewood dipped in ______were used as matches in ancient Egypt.
Question 120 :
The substances which have very low ignition temperature and can easily catch fire with a flame are called_______ substances
Question 121 :
The portion of the flame just outside gets red hot on burning. What type of area it is?
Question 122 :
The substance expected to have the highest ignition temperature out of the following is
Question 126 :
Is it True or False that a physical process in which a substance reacts with oxygen to give off heat is called combustion?
Question 127 :
Is it True or false that middle zone is the hottest zone of a flame?
Question 128 :
Fill in the blank: Fuel must be heated to its _________ before it starts burning.
Question 129 :
The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called as-
Question 131 :
State TRUE or FALSE: The head of the safety match contains only Antimony Trisulphide, Potassium Chlorate and White Phosphorus with some glue.
Question 138 :
In an experiment, 4.5 kg of fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
Question 140 :
Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire; he poured water to extinguish the fire. Why was the action of Manu not suitable.
Question 145 :
The __________ temperature at which a substance catches fire is called its __________ temperature.
Question 149 :
Shyam was cooking potato curry on a chulha. To his surprise he observed that the copper vessel was getting blackened from outside. It may be due to:
Question 150 :
True or False. A flame is a region where combustion of gases takes place.
Question 152 :
Paddy is a major cereal crop in our country. What measures must be taken to prevent spoilage and insect attack of harvested grains.
Question 155 :
Using good quality seed is the only criterion to get high yield
Question 157 :
Which of the following statement is not true for organic manure?
Question 160 :
Certain plants of same kind grown on a large scale is known as.
Question 162 :
Name a rabi crop that is also one of the pulses.
Question 165 :
The monsoon season in our country is during the months of ________.
Question 167 :
The term used for the separation of grains from chaff is called as _______.
Question 168 :
For growing a crop, suficient sunlight,_____________ and _______________ from the soil are essential.
Question 169 :
Paddy is a major cereal crop in our country. Discuss the method of sowing?
Question 170 :
Which of the following tools would a farmer use to remove weeds from the field?
Question 171 :
Terms related to agricultural practice are given below. Rearrange them in the correct sequence. harvesting, sowing, manuring, tilling and ploughing, irrigation, weeding
Question 172 :
Keeping crop grains for a long time under proper conditions is known as.
Question 173 :
Match the agricultural implement with the following options given Sprinkler is related to
Question 174 :
Match the agricultural implement with the following options given Sickle is related to
Question 175 :
Given below are statements about the harmful effects of weeds on crop plants
1. They interfere in harvesting
2. They help crop plants to grow healthy
3. They compete with crop plants for water,nutrients,space and light
4. They effect plant growth.
Choose the correct combination of statements.
Question 176 :
The process of loosening and turning of soil is called as _______.
Question 178 :
Name the tool used with tractor for sowing seeds in a field.
Question 179 :
Match the agricultural implement with the following options given Hoe is related to
Question 180 :
Beera, wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen and why?
Question 181 :
Which of the following are the advantages of using the tool which is used with tractor for sowing seeds in a field.
Question 183 :
The system of irrigation where in water is supplied drop by drop near the roots of plants,is called as _________.
Question 185 :
The same kind of plants grown and cultivated on a large scale at a place is called _______________.
Question 186 :
Read the statements given below
1.Seeds require moisture for germination
2.Plants can absorb nutrients mostly in dissolved form
3.Irrigation protects crops from both frost and hot air current
4.Irrigation improves soil texture.
Choose the combination of statements which indicate the need to irrigate crops.
Question 189 :
Growing different crops in different seasons in the same field will deplete the soil of nutrients
Question 191 :
Match the agricultural implement with the following options given Seed drill is related to
Question 192 :
Name the practice followed for large scale rearing of farm animals?
Question 195 :
If you are given a dry piece of land for cultivation what will you do before sowing the seeds?
Question 201 :
When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly due to which of the following reason(s)?
Question 202 :
It is obvious that the force of friction will ______ if the two surfaces are pressed harder.
Question 203 :
If an object started moving, it would never stop if there were no friction.
Question 205 :
Friction opposes relative motion between the surfaces of the book and the table. True or false?
Question 206 :
In fact, when a machine is operated, heat generated causes much wastage of _________.
Question 207 :
Four children were asked to arrange forces due to rolling, static and sliding frictions in decreasing order. Their arrangements are given below. Choose the correct arrangement.
Question 209 :
If you place a book over 3 cylindrical pencils and push it, is it easier to move the book this way?
Question 210 :
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
Question 211 :
To reduce friction, the shape of an aeroplane is made similar to which organism?
Question 212 :
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may
Question 213 :
Imagine that an object is falling through a long straight glass tube held vertical; air has been removed completely from the tube. The object does not touch the walls of the tube. Will the object experience any force of friction?
Question 214 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d070f59b460d7261f2ef.PNG' />
In the above image, a boy is shown pushing the box from right to left.The force of friction will act on the box
Question 218 :
A toy car released with the same initial speed will travel farthest on
Question 219 :
A marble is allowed to roll down an inclined plane from a fixed height. At the foot of the inclined plane, it moves on a horizontal surface (a) covered with silk cloth (b) covered with a layer of sand and (c) covered with a glass sheet. On which surface will the marble move the shortest distance.
Question 221 :
You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor?
Question 222 :
Spring balance consists of ________ which gets stretched when a force is applied to it.
Question 224 :
You spill a bucket of soapy water on a marble floor accicdentally . Would it be dificult for you to walk on the floor ? Choose the correct reason of your answer.
Question 226 :
How do objects overcome the force of friction exerted by fluids on them?
Question 228 :
Will force of friction come into play when a rain drop rolls down a glass window pane?
Question 229 :
In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is
Question 230 :
The frictional force on an object in a fluid depends on its ____ with respect to the fluid.
Question 231 :
Which force comes into play when you push a book on a table?
Question 232 :
Cartilage is present in the joints of our body, which helps in their smooth movement. With advancing age, this cartilage wears off. How would this affect the movement of joints?
Question 234 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d072f59b460d7261f2f1.PNG' />
In the above image, Two blocks of iron of different masses are kept on a cemented floor.Which one of them would require a larger force to move it from the rest position?
Question 235 :
The handle of a cricket bat or a badminton racquet is usually rough. Which of the following is the reason for it?
Question 236 :
State true or false: When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly.
Question 237 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d072f59b460d7261f2f2.PNG' />
In the above image, two boys are shown applying force on a box. If the magnitude of the force applied by each is equal, will the box experience any force of friction?
Question 238 :
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor . Who will have to apply a larger force?
Question 239 :
You spill a bucket of soapy water on a marble floor accicdentally . Would it make it easier or more difficult for you to walk on the floor?
Question 241 :
State true or false: There is rolling friction between the wheels of a moving train and iron rails.
Question 243 :
Friction opposes the ___________ between the surfaces in contact with each other.
Question 244 :
Four children wore asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
Question 245 :
We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other due to which of the following reasons?
Question 246 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0daf59b460d7261f376.PNG' />
From the above figure, if you tie a string around a brick and pull it by spring balance and then wrap a polythene on it and repeat the activity, will the spring balance measurement show any difference?
Question 247 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d071f59b460d7261f2f0.PNG' />
In the above image, While playing tug of war Preeti felt that the rope was slipping through her hands. Which of the following is a way out for her to prevent this?
Question 252 :
A place reserved for wild life where they can freely use the habitats and natural resources is known as?
Question 253 :
The animals found in a particular area is termed as ______ ?
Question 255 :
The Red Data Book keeps a record of which of the following: (i) endemic species. (ii) extinct species. (iii) endangered plants. (iv) endangered animals.
Question 256 :
What do black buck, elephant, python and golden cat together represent in a forest?
Question 257 :
The place meant for conservation of biodiversity in their natural habitat are: (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park.
Question 259 :
State true or false. Plants of a particular area are collectively termed as fauna.
Question 260 :
State true or false. There can be a wildlife sanctuary within a biosphere reserve.
Question 262 :
Why do migratory birds fly to far away areas every year during a particular time?
Question 263 :
Which one of the following statements is true about a biosphere reserve?
Question 265 :
Project Tiger was launched by the government to protect the tigers in the country. What was the objective of this project ?
Question 266 :
The plants found in a particular area is termed as ______ ?
Question 267 :
Can a forest regenerate naturally in a short period of time?
Question 268 :
A place where animals are protected in their natural habitat is known as?
Question 269 :
State true or false. Deforestation leads to an increase in the water holding capacity of the soil.
Question 272 :
Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called __________?
Question 273 :
Clearing of forests (by cutting down forest trees)over a wide area is called _______?
Question 274 :
The increase in temperature on the earth disturbs the water cycle and may reduce rainfall. This could cause __________?
Question 275 :
Why do migratory birds fly to far away areas every year during a particular time?
Question 276 :
The animals found in a particular area is termed as ______ ?
Question 278 :
What will happen if the top layer of the soil is exposed?
Question 279 :
Why do migratory birds fly to far away areas every year during a particular time?
Question 280 :
The plants found in a particular area is termed as ______ ?
Question 281 :
Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour? (i) Unavailability of food. (ii) Extreme weather conditions. (iii) Over crowding. (iv) Lack of nesting areas.
Question 282 :
What are the examples of endemic flora of the Pachmarhi Biosphere Reserve?
Question 283 :
What is that part of the earth in which living organisms exist or which supports life?
Question 284 :
Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called __________?
Question 286 :
Clearing of forests (by cutting down forest trees)over a wide area is called _______?
Question 287 :
The other properties of the soil like nutrient content, texture etc., also change because of deforestation. TRUE OR FALSE ?
Question 288 :
A place where animals are protected in their natural habitat is known as?
Question 289 :
__________ is restocking of the destroyed forests by planting new trees.
Question 291 :
State true or false. There can be a wildlife sanctuary within a biosphere reserve.
Question 292 :
Which one of the following statements is true about endemic species?
Question 293 :
The place meant for conservation of biodiversity in their natural habitat are: (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park.
Question 294 :
Which one of the following statements is true about endemic species?
Question 295 :
State true or false. Bison is an endemic fauna of Pachmarhi Biosphere Reserve.
Question 297 :
The animals found in a particular area is termed as ______ ?
Question 298 :
The other properties of the soil like nutrient content, texture etc., also change because of deforestation. TRUE OR FALSE ?
Question 299 :
Clearing of forests (by cutting down forest trees)over a wide area is called _______?
Question 300 :
Endemic species are those species of plants and animals which are found exclusively in a particular area. Is it TRUE OR FALSE?
Question 302 :
Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?
Question 304 :
Which metals are soft and can be cut with a knife?
Question 307 :
Generally, metals are good conductors of heat and electricity but non-metals are poor conductors.
Question 309 :
What is the property of metals by which they can be beaten into thin sheets is called?
Question 312 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0def59b460d7261f37b.JPG' />
From the above image, Is the above equation correct if saloni took a piece of burning charcoal and collected the gas evolved in a test tube?
Question 314 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. Find the nature of the gas.
Question 316 :
A metal which reacts with acid as well as base to form hydrogen gas.
Question 317 :
Name the major non-metals which are present in fertilisers and enhance the growth of plants.
Question 318 :
Complete the reaction, $ Iron (Fe) + Oxygen (O_2) + Water (H_2O) → ?$ ?
Question 320 :
Name the soft metals which can be cut with a knife.
Question 321 :
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Question 322 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d081f59b460d7261f306.PNG' />
From the image above, find out the names of three non metals
Question 323 :
What is the property of metal by which it can be drawn into wires is called?
Question 324 :
The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas.
Question 325 :
When a copper vessel is exposed to moist air for long, it acquires a dull green coating. TRUE OR FALSE?
Question 327 :
Phosphorus is a very reactive non-metal. It catches fire if exposed to air, to prevent the contact of phosphorus with atmospheric oxygen, it is stored in _______
Question 330 :
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?
Question 333 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d084f59b460d7261f309.PNG' />
From the above image, fill in the blank. Metals are good __________ of electricity.
Question 334 :
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Question 337 :
Generally, metals are malleable and ductile. Non-metals do not have these properties.
Question 339 :
Metals react with acids and produce metal salts and hydrogen gas. Generally, non-metals do not react with acids.
Question 341 :
The property of metals by virtue of which they can be drawn into wires is called ductility. True or False
Question 344 :
Oxides of non-metals and metals are acidic in nature. True or False
Question 345 :
Is it TRUE OR FALSE, Sodium is a very reactive metal?
Question 348 :
Why Immersion rods for heating liquids are made up of metallic substances?
Question 350 :
A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.
Question 351 :
An image formed by a mirror the left of the object appears on the right and the right appears on the left. This is known as _______________ ?
Question 352 :
The outer coat of the eye is white. It is tough so that it can protect the interior of the eye from accidents. Its transparent front part is called ______?
Question 353 :
lf you touch your _________ ear with your righthand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with _______ .
Question 354 :
Fill in the blanks: Night birds have ___________ cones than rods in their eyes.
Question 355 :
When angle of incidence is equal to the angle of reflection
Question 356 :
Fill in the blanks: A person 1 m in front of a plane mirror seems to be _____ away from his image?
Question 358 :
After striking the mirror, the ray of light is reflected in another direction. The light ray, which strikes any surface, is called ________ ?
Question 359 :
The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?
Question 360 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0f9f59b460d7261f39e.PNG' />
Refer to the above figure. Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see himself in the mirror?
Question 362 :
How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
Question 363 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on White Chalk powder that is used in school?
Question 364 :
Where does the lens of our eye form the
image of an object?
Question 365 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Question 366 :
The incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane. This law is known as ____________ ?
Question 367 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f3a0.PNG' />
Refer to the above figure. Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see the image of objects situated at P, Q and R?
Question 369 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f302.jpg' />
In the above figure of the human eye, the cornea is represented by the letter
Question 370 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0fbf59b460d7261f3a1.PNG' />
Refer to the above figure. Can Paheli at B see the position of the image of an object situated at A in the plane mirror ?
Question 371 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d075f59b460d7261f2f6.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. Let us assume that mirrors are placed at the turns so that he can see the object. If any of the mirrors is removed, will he be able to see the objects?
Question 372 :
Suppose you are in a dark room. Can you see objects in the room?
Question 375 :
Part of the eye which controls the light entering is called
Question 376 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07bf59b460d7261f2fe.jpg' />
Light is falling on surface $S_1$, $S_2$, $S_3$ as shown in the above figure. Surfaces on which the angle of incidence is equal to the angle of reflection is/are
Question 378 :
Eyes of the nocturnal birds have large cornea and a large pupil.
How does this structure help them?
Question 379 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Question 380 :
A person 1 m in front of a plane mirror seems to be _______ m away from his image.
Question 381 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0dcf59b460d7261f378.JPG' />
From the above image, Can Paheli at B see this image?
Question 382 :
Behind the cornea, we find a dark muscular structure called _____ ?
Question 383 :
Suppose you are in a dark room. Can you see objects OUTSIDE the room?
Question 384 :
Which one of the following is an example of illuminated object?
Question 385 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Mirror?
Question 386 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on a Piece of paper?
Question 387 :
In the iris, there is a small opening called the __________?
Question 388 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Cardboard surface?
Question 390 :
The retina contains several nerve cells. Sensations felt by the nerve cells are then transmitted to the brain through the optic nerve. Is it TRUE OR FALSE?
Question 391 :
At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the _________?
Question 392 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07df59b460d7261f301.jpg' />
A small hole P is made in a piece of cardboard as shown in the above figure. The hole is illuminated by a torch. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed so that the hole can be seen?
Question 393 :
The most popular resource for visually challenged persons is Braille, it was developed by?
Question 394 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07cf59b460d7261f2ff.jpg' />
In the above figure, a tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in the figure as A, B, C and D. ln which position mirror will be visible?
Question 395 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d073f59b460d7261f2f3.jpg' />
Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. What must be the angle with respect to the incident light at which he should place the mirrors?
Question 396 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f39f.PNG' />
Refer to the above figure. Can Boojho at C see the position of the image of an object situated at A in the plane mirror ?
Question 397 :
The number of images formed by mirrors placed at an angle to one another to make numerous beautiful patterns is used in a _________ ?
Question 398 :
The angle between the normal and incident ray is called the ___________ ?
Question 399 :
What is the most comfortable distance at which one can read with a normal eye?
Question 400 :
The lens focuses light on the back of the eye, on a layer called?
Question 401 :
Which ambitious plan to save the Ganga river was launched in 1985?
Question 404 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Carbon dioxide, 'thaneme', nitrous oxide and water vapour are known as 'heengrouse sesga'.
Question 405 :
Which of the following is not a way to conserve water?
Question 407 :
State True or False.
A brick kiln emits lot of smoke and other harmful gases causing air pollution.
Question 408 :
State True or False.
The Gangotri glacier in the Himalayas has started melting because of global warming.
Question 409 :
State True or False.
Pollution is no longer a distant phenomenon. It is affecting the quality of our daily lives.
Question 412 :
State True or False.
We can survive for some time without air but we cannot survive even for a few minutes without food.
Question 413 :
Water contaminated with sewage may contain bacteria, viruses, fungi and parasites which cause diseases like-
Question 414 :
Carbon monoxide is a poisonous gas. It reduces the _____ carrying capacity of the blood
Question 415 :
State True or False.
Chlorination is a commonly used chemical method for killing germs in water.
Question 416 :
Gases like methane, nitrous oxide contribute towards rising temperature of earth's atmosphere. What are they called?
Question 417 :
This chemical protects our crops and is washed into water bodies from the field-
Question 420 :
Which substance is used in refrigerators, air conditioners and aerosol sprays?
Question 422 :
The Ganga at which part in Uttar Pradesh (U.P.), has one of the most polluted stretches of the river?
Question 426 :
Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution?
Question 427 :
The Supreme Court has ordered industries to switch to cleaner fuels like -
Question 428 :
Which gas is produced by combustion of fuels like coal in power plants and can cause respiratory problems?
Question 430 :
The soil is affected by impure water which causes changes like -
Question 431 :
World Wide Fund for Nature (WWF) found that Ganga is one of the ten most _____ rivers in the world.
Question 432 :
We should always use more chlorine tablets than specified.
State true or false.
Question 433 :
Water is becoming scarce due to increase in which of the following activities?
Question 434 :
Excess of which of the following gas in the air is responsible for this green house effect
Question 436 :
Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air.
Question 437 :
A part of the radiation that falls on the earth is absorbed by sun rays and a part is reflected back into space. A part of the reflected radiation is trapped by the ______.
Question 439 :
Can we plant trees and nurture the ones already present in the neighbourhood to save trees and stop pollution?
Question 440 :
By volume, about __% of the air mixture is nitrogen and about __% is oxygen.
Question 441 :
Once the algae in water die, they serve as a food for decomposers like -
Question 443 :
River which is famous in India and sustains most of the northern central and eastern Indian population-
Question 446 :
In the following statements, the words in inverted commas are jumbled up. Write them in their correct form. Whenever harmful substances such as 'wagese', toxic chemicals, silt, etc. get mixed with water, the water becomes 'potdulle'.
Question 447 :
Acid rain corroding the marble of the monument is called _____
Question 448 :
The trapping of radiations by the earth’s atmosphere is similar. That is why it is called the -
Question 449 :
The excessive quantities of chemicals released in water acts as nutrients for the growth of which organism?
Question 452 :
A tadpole develops into an adult frog by the process of___________
Question 454 :
The life cycle of the silkworm consists: egg → _______→ pupa → adult
Question 455 :
In human beings, the correct sequence of events during
reproduction is
Question 456 :
Since new individuals develop from the buds in hydra, this type of asexual reproduction is called _________.
Question 458 :
In adult human females, a single mature egg is released into an oviduct every month. TRUE or FALSE?
Question 463 :
State True or False for the following statement:-
Viviparous animals lay eggs.
Question 464 :
External fertilisation can occur both in water and on land. TRUE or FALSE?
Question 465 :
Soon after fertilisation, the zygote divides repeatedly and travels down the__________
Question 467 :
Animals exhibiting external fertilisation produce a large number
of gametes. Pick the appropriate reason from the following.
Question 470 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0a6f59b460d7261f32c.PNG' />
In the above image, what is A?
Question 471 :
The embryo gets embedded in the wall of the ___________ for further development, in Fertilisation.
Question 472 :
The term used for bulges observed on the sides of the body of hydra is called _______
Question 473 :
Egg laid after fertilisation is made up of a single cell.
Question 474 :
In humans, the development of fertilised egg takes place in the
Question 475 :
In markets, eggs of birds are available but never eggs of dogs. Why?
Question 476 :
Is the statement correct : Reproduction happens generally in two modes. These are Sexual reproduction and Asexual reproduction. ?
Question 478 :
Mother gives birth to a baby but the baby has characters of both parents. How is this possible?
Question 479 :
The type of reproduction in which only a single parent is involved is called ___________.
Question 482 :
State the following statement True or False:-
The transformation of the larva into an adult through drastic changes is called metamorphosis.
Question 483 :
State the following statement True or False:-
In each hydra, there may be one or more bulges. These bulges are the developing new individuals and they are called buds.
Question 489 :
In which type of reproduction, formation of zygote begins from the fusion of male and female gametes?
Question 490 :
In Fertilisation , the zygote divides repeatedly to give rise to a ball of cells and further develops into ________.
Question 491 :
In human beings, after fertilisation, the structure which gets
embedded in the wall of uterus is
Question 492 :
The reproductive parts in animals produce gametes that fuse to form a ________.
Question 494 :
Which of the following statements about reproduction in humans is correct?
Question 495 :
Aquatic animals in which fertilisation occurs in water are said to be
Question 497 :
The process of the fusion of the gametes is called ___________
Question 498 :
The female reproductive organs are a pair of ovaries, _________ and the uterus
Question 499 :
The life cycle of the frog consists: egg → ______ → adult
Question 501 :
Which states in India where earthquakes are more likely to strike?
Question 502 :
What precautions should be taken if one is outside in a forest where no shelter is available and you are in an open field during a thunderstorm?
Question 503 :
Earthing is provided in buildings to protect us from electrical shocks due to any leakage of ?
Question 504 :
State true or false Earthquakes occur all the time all over the world.
Question 506 :
Electrical charge can be transferred from a charged object to another through a
Question 508 :
The strips carrying similar charges _________ each other and they become wide open.
Question 509 :
During the construction of a building the lightning conductor was left hanging in the air by mistake. Would the lightning conductor be still effective?
Question 511 :
If the materials used for constructing a building were good conductors, do you think lightning will strike the building?
Question 512 :
The boundaries of the plates are the weak zones where earthquakes are more likely to occur. The weak zones are also known as
Question 514 :
If the materials used for constructing a building were good conductors, will the lightning conductor be still required to be installed in the building?
Question 515 :
Lightning Conductor is a device used to protect buildings from the effect of lightning. Is it TRUE OR FALSE?
Question 517 :
The process of transferring of charge from a charged object to the earth is called
Question 519 :
The power of an earthquake is expressed in terms of a magnitude on a scale called
Question 520 :
The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella?
Question 521 :
What precautions would you take if lightning occurs while you are outside the house?
Question 522 :
Lightning conductor cannot protect a building from lightning. State TRUE or FALSE.
Question 523 :
The outermost layer of the earth is not in one piece. It is fragmented. Each fragment is called :
Question 525 :
Electric current is to be passed from one body to another. For this purpose the two bodies must be joined by ___________.
Question 527 :
Two charged objects are brought close to each other. Choose the most appropriate statement from the following options:
Question 528 :
Lightning Conductor is a device used to protect buildings from the effect of lightning. Is it TRUE OR FALSE?
Question 529 :
What precautions would you take if lightning occurs while you are outside the house?
Question 531 :
A charged glass rod attract a charged plastic straw. State TRUE or FALSE.
Question 533 :
When a glass rod is rubbed with a piece of silk cloth the rod ________________.
Question 534 :
State true or false. Tremors on the earth can also be caused by the eruption of a volcano.
Question 538 :
It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as ___________.
Question 540 :
Why our hair stands when we take off woollen or polyester cloth?
Question 541 :
It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as ___________.
Question 542 :
An earthquake measures 3 on the richer scale. Is it likely to cause much damage?
Question 545 :
A sudden shaking or trembling of the earth which lasts for a very short time is known as
Question 546 :
The seismic waves are recorded by an instrument called the _________
Question 547 :
What precautions should be taken if you are Inside the house during a thunderstorm?
Question 548 :
One natural phenomenon which we are not yet able to predict accurately is
Question 549 :
What is caused by the accumulation of charges in the clouds?
Question 551 :
What is the term used for secretions of endocrine glands responsible for changes taking place in the body?
Question 552 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d09af59b460d7261f326.PNG' />
In the above figure, fill the blank circles and identify the sex of child A.
Question 553 :
Choose the correct word for the given clue. Clue - Glands without ducts.
Question 554 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0f3f59b460d7261f396.png' />
From the above image, fill in the crossword puzzle using the following hint: Endocrine gland attached to brain
Question 556 :
Structures present in a cell which is responsible for determination of the sex of a baby is _____.
Question 557 :
Choose the correct word for the given clue. Clue - Pancreatic hormone
Question 562 :
Hormones are secretions of endocrine glands which pour them directly into the ______.
Question 563 :
One ovum matures and is released by one of the ovaries once in about ______.
Question 565 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0e6f59b460d7261f385.jpg' />
What conclusions can be drawn from the above graphs where Y and X axis represents height and age respectively?
Question 566 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d096f59b460d7261f321.PNG' />
In the above figure mark the positions of the endocrine glands which release the hormones that prevents diabetes.
Question 567 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0eef59b460d7261f390.png' />
From the above image, fill in the crossword puzzle using the following hint: Male hormone
Question 568 :
State true or false. The period of life, when the body undergoes changes, leading to reproductive maturity is known as adolescence.
Question 570 :
The unfertilised egg always has one X chromosome. TRUE or FALSE?
Question 571 :
AIDS can spread from an infected person to another person through _____.
Question 572 :
Indian gooseberry (amla) are not good for adolescents. TRUE or FALSE?
Question 573 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0eef59b460d7261f38f.png' />
From the above image, fill in the crossword puzzle using the following hint: Hormone reaches here through blood stream
Question 574 :
Choose the correct word for the given clue. Clue - Voice Box
Question 576 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d099f59b460d7261f325.PNG' />
In the above figure, fill the blank circles and identify the sex of child B.
Question 577 :
A girl becomes pregnant if she looks at boys during menstruation. Is this a myth?
Question 578 :
All parts of the body grow at the same rate. TRUE or FALSE?
Question 579 :
State the following statement True or False:-
Reproductive life of a woman lasts from menarche to menopause.
Question 581 :
Name the hormone which would be released during the following situations: a frightened person.
Question 582 :
Out of the following, which is the correct match for Pancreatic hormone
Question 583 :
Choose the correct word for the given clue. Clue - Another term for teenage
Question 585 :
Adolescence lasts upto 18 or 19 years of age. TRUE or FALSE?
Question 587 :
The onset of puberty and maturity of reproductive parts are controlled by ________.
Question 588 :
The mother is responsible for the sex of her child. Is this a myth?
Question 589 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d092f59b460d7261f31d.PNG' />
In the above figure mark the positions of the endocrine glands which release the hormones that maintains the correct salt balance in the blood.
Question 590 :
Name the hormone which would be released during the following situations:development of tadpole to frog.
Question 592 :
Release of sex hormones is under the control of a hormone secreted from the __________.
Question 593 :
Out of the following, which is the correct match for Male hormone
Question 595 :
Give a suitable word for the following statement. It marks the beginning of reproductive period.
Question 596 :
The change in the body parts indicate that one is no longer a child but on the way to becoming an adult. TRUE or FALSE?
Question 597 :
Give a suitable word the following statement.The site which responds to a hormone.
Question 598 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0f0f59b460d7261f392.png' />
From the above image, fill in the crossword puzzle using the following hint: Voice box
Question 599 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0f1f59b460d7261f393.png' />
From the above image, fill in the crossword puzzle using the following hint: Teenage
Question 601 :
Pathogenic micro-organisms present in host cells are killed by medicines called
Question 602 :
Unscramble the jumbled words underlined in the following statement.Yeasts are used in the wine industry because of their property of $\underline {meronettinaf}$ .
Question 603 :
Unscramble the jumbled words underlined in the following statement: $\underline {Xanrhat}$ is a dangerous bacterial disease.
Question 604 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d087f59b460d7261f30e.JPG' />
Observe the image and write the name of the disease
Question 609 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f318.JPG' />
From the above image find out what changes will you observe in B when the released gas passes through it
Question 610 :
Suggest a suitable word for the following statement. Agent which spreads pathogens from one place to another.
Question 611 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08cf59b460d7261f315.JPG' />
From the above figure complete the following cycle , By filling the blank (d)
Question 614 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f312.JPG' />
From the above figure complete the following cycle , By filling the blank (a)
Question 616 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08cf59b460d7261f314.JPG' />
From the above figure complete the following cycle , By filling the blank (c)
Question 621 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f317.JPG' />
From the above image find out which gas is released in A?
Question 622 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d089f59b460d7261f310.JPG' />
Observe the above image and find out how does the disease spread from one plant to another.
Question 627 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d089f59b460d7261f310.JPG' />
Observe the above image and find out how does the disease spread from one plant to another.
Question 628 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08df59b460d7261f316.JPG' />
From the above image find out what happens to the sugar solution in A?
Question 629 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d086f59b460d7261f30c.JPG' />
From the above image name the food item on which the organism lives.
Question 630 :
Unscramble the jumbled words underlined in the following statement: Cells of our body produce $\underline {santiidobe}$ to fight pathogens.
Question 631 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08bf59b460d7261f313.JPG' />
From the above figure complete the following cycle , By filling the blank (b)
Question 633 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08df59b460d7261f316.JPG' />
From the above image find out what happens to the sugar solution in A?
Question 634 :
Suggest a suitable word for the following statement. Agent which spreads pathogens from one place to another.
Question 636 :
Suggest a suitable word for the following statement. Chemicals added to food to prevent growth of microorganisms.
Question 637 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f311.JPG' />
Observe the above image and name any two plant diseases and the microbes that cause
them.
Question 638 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f317.JPG' />
From the above image find out which gas is released in A?
Question 639 :
Unscramble the jumbled words underlined in the following statement.Yeasts are used in the wine industry because of their property of $\underline {meronettinaf}$ .
Question 643 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d085f59b460d7261f30b.JPG' />
From the above image find the name of the microorganism and the group which it belong to.
Question 644 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08af59b460d7261f311.JPG' />
Observe the above image and name any two plant diseases and the microbes that cause
them.
Question 645 :
Unscramble the jumbled words underlined in the following statement: $\underline {Xanrhat}$ is a dangerous bacterial disease.
Question 648 :
The disease caused by a protozoan and spread by an insect is
Question 650 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d08ef59b460d7261f318.JPG' />
From the above image find out what changes will you observe in B when the released gas passes through it
Question 651 :
There are many man-made satellites revolving round the Earth. These are called ____
Question 652 :
Which of the following is NOT a planet of the sun?
Question 655 :
The period of revolution ______ as the distance of the planet ____ from the sun.
Question 656 :
On the fifteenth day the moon is not visible. This day is known as the______
Question 657 :
The day on which the whole disc of the moon is visible is known as _____
Question 659 :
Some meteorological bodies that reaches the Earth are called as ______.
Question 660 :
_______ is another prominent constellation in the northern sky. It is visible during winter in the early part of the night
Question 661 :
John saw full moon on a particular day. After how many days will he be able to see the full moon again?
Question 662 :
State true or false. All the stars are at the same distance from us.
Question 663 :
The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?
Question 664 :
State true or false. The planets keep changing their position with respect to stars.
Question 665 :
Stars have their own light. Is sun also a star as it has its own light?
Question 666 :
________ has been associated with seven well known ancient Indian sages, or rishis.
Question 667 :
Suppose a new planet is discovered between Uranus and Neptune. Its time period would be ______.
Question 670 :
In which part of the sky can you find Venus if it is visible as an evening star?
Question 673 :
Are stars present the sky during the daytime? Why are they not visible?
Question 676 :
True or False. The Earth is the only planet in the solar system on which life is known to exist.
Question 677 :
True or False. The axis of rotation of the Earth is perpendicular to the plane of its orbit.
Question 679 :
The time taken by a planet to complete one rotation is called its ____
Question 682 :
The stars forming a group that has a recognisable shape is called a ______
Question 684 :
A planet has a definite path in which it revolves around the Sun. This path is called an ____
Question 685 :
An astronaut standing on the surface of the moon throws a ball upwards. The ball would:
Question 689 :
Solar system consists of ____ number of bodies such as planets, comets, asteroids and meteors.
Question 691 :
A _____appears generally as a bright head with a long tail.
Question 692 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0adf59b460d7261f336.jpg' />
In the above figure, in which part of the sky would you see the full moon in the
evening?
Question 697 :
Any celestial body revolving around another celestial body is called its _____.
Question 699 :
State true or False. When astronauts landed on the moon, they found that the moon’s surface is dusty and barren.
Question 705 :
Presence of excessive noise in the surroundings may cause many health related problems. True or false ?
Question 706 :
State True or False: If the amplitude of vibration is large, sound is feeble.
Question 710 :
Which part of our body vibrate when we hear a sound?
Question 711 :
In order to reduce the loudness of a sound we have to
Question 712 :
Fill in the blank: Time taken by an object to complete one oscillation is called ______.
Question 715 :
The shape of the outer part of the ear is like a _____.
Question 716 :
A list of mediums is given. (i) wood (ii) water (iii) air (iv) vacuum. In which of these mediums can sound travel?
Question 719 :
Suppose a stick is struck against a frying pan in vacuum. Will we be able to hear the sound?
Question 720 :
A pendulum oscillates 40 times in 4 seconds. Find its frequency.
Question 721 :
The townhall building is situated close to Boojho’s house. There is a clock on the top of the townhall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.
Question 722 :
An object is vibrating at 50 hertz. What is its time period?
Question 725 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0abf59b460d7261f333.jpeg' />
In the above figure an alarm bell is kept inside a vessel. A person standing close to it can distinctly hear the sound of alarm. Now if the air inside the vessel is removed completely how will the loudness of alarm get affected for the same person?
Question 726 :
Time taken by an object to complete one oscillation is called __________.
Question 729 :
Which of the following statements are correct? (i) Sound is produced by vibrations. (ii) Sound requires a medium for propagation. (iii) Light and sound both require a medium for propagation. (iv) Sound travels slower than light.
Question 732 :
State True or False: Noise pollution may cause partial hearing impairment.
Question 733 :
Voice of which of the following is likely to have minimum frequency?
Question 736 :
The number of oscillations per second of a vibrating object is called its time period. True or false ?
Question 741 :
For human ear, the range of audible frequencies is roughly from _____ to _____ Hz.
Question 743 :
Loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. State true or false.
Question 746 :
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate?
Question 747 :
Noise pollution may cause partial hearing impairment. Is that correct ?
Question 749 :
How can we recognize many familiar sounds without seeing the objects producing them?
Question 750 :
We have a stringed musical instrument. The string is plucked in the middle first with a force of greater magnitude and then with a force of smaller magnitude. In which case would the instrument produce a louder sound?
Question 751 :
Rohit took with him some nylon ropes, when he was going for rock climbing. Can you tell why he selected nylon ropes instead of ropes made of cotton or jute?
Question 752 :
The synthetic fibres are also known as animal made fibres .
Question 753 :
Indicate whether the following statements are True or False. Most of the plastics are biodegradable.
Question 754 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b8f59b460d7261f346.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 3: Substance made up of large number of smaller molecules
Question 755 :
Which of the following is not a common property of plastics?
Question 757 :
State True or False.A polymer is a chain of many small units joined together called monomers
Question 759 :
Indicate whether the following statements are True or False. The fabric terywool is obtained by mixing terylene and wool.
Question 760 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b7f59b460d7261f344.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 1: Substance used as synthetic wool
Question 761 :
The material which is commonly used for making kitchen containers is
Question 763 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b8f59b460d7261f345.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 2: A plastic used for making containers and carry bags
Question 764 :
Indicate whether the following statements are True or False. The fabric terywool is obtained by mixing terylene and wool.
Question 768 :
The most suitable material for the preparation of handles of cooking utensils is
Question 769 :
The material which is commonly used for making kitchen containers is
Question 770 :
State True or False. Burning of plastics and synthetic fibres produces lots of poisonous gases causing air pollution.
Question 771 :
State True or False. Cotton is a natural polymer whose chemical name is cellulose.
Question 772 :
Indicate whether the following statements are True or False. Synthetic fibres do not melt on heating.
Question 773 :
State True or False. Burning of plastics and synthetic fibres produces lots of poisonous gases causing air pollution.
Question 774 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0baf59b460d7261f348.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 4: Another name for this compound is artificial silk
Question 775 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b9f59b460d7261f347.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 5: A type of fibre obtained naturally from cocoon
Question 776 :
Terrycot is made by mixing two types of fibres. Write the names of the fibres.
Question 777 :
Rohit took with him some nylon ropes, when he was going for rock climbing. Can you tell why he selected nylon ropes instead of ropes made of cotton or jute?
Question 778 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bbf59b460d7261f34a.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 6: A synthetic fibre classified as polyester
Question 780 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0baf59b460d7261f348.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 4: Another name for this compound is artificial silk
Question 781 :
Indicate whether the following statements are True or False. Synthetic fibres do not melt on heating.
Question 782 :
Indicate whether the following statements are True or False. It is risky to wear synthetic clothes while working in the kitchen.
Question 783 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bbf59b460d7261f349.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 7: A polymer used for making rope
Question 785 :
State True or False. Acrylic is a fibre similar to wool .
Question 786 :
A synthetic fiber which looks like silk is obtained by chemical treatment of wood pulp. It is, therefore, known as artificial silk. What is its common name?
Question 787 :
State True or False. Cotton is a natural polymer whose chemical name is cellulose.
Question 788 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bcf59b460d7261f34b.png ' />
From the above image, say which of the following represents the correct match for items in Column A with those in Column B.
Question 789 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b8f59b460d7261f346.png' />
From the above image ,Complete the crossword given below with the help of clues.
Across 3: Substance made up of large number of smaller molecules
Question 792 :
The synthetic fibres are also known as animal made fibres .
Question 793 :
Indicate whether the following statements are True or False. Most of the plastics are biodegradable.
Question 794 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bbf59b460d7261f349.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 7: A polymer used for making rope
Question 795 :
State True or False. Acrylic is a fibre similar to wool .
Question 797 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0b9f59b460d7261f347.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 5: A type of fibre obtained naturally from cocoon
Question 799 :
Which of the following is not a common property of plastics?
Question 800 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bbf59b460d7261f34a.png' />
From the above image ,Complete the crossword given below with the help of clues.
Down 6: A synthetic fibre classified as polyester
Question 804 :
An organism with billions of cells begins life as ______ which is the fertilised egg.
Question 806 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04bf59b460d7261f2c1.PNG' />
In the above image two columns are shown. Match column I with column II.
Question 807 :
What is the size of the smallest cell in case of bacteria?
Question 808 :
Nucleus is separated from the cytoplasm by a membrane called the _____________.
Question 809 :
Various other components, or organelles, of cells are present in the cytoplasm. These are _______
Question 814 :
State TRUE or FALSE: Gene controls the transfer of a hereditary characteristic from parents to offspring.
Question 815 :
Give example of a cell that helps to receive and transfer messages to our body system.
Question 816 :
Which of these are the differences between plant and animal cell?
Question 822 :
_______ is an additional covering over the cell membrane in plant cells.
Question 823 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04cf59b460d7261f2c2.PNG' />
The cell shown in the above image represents
Question 827 :
The cells having nuclear material without nuclear membrane are termed ______.
Question 828 :
The jelly-like substance between the nucleus and the cell membrane is called ___________.
Question 829 :
The unit of measurement used for expressing dimension (size) of cells is
Question 831 :
The basic components of a cell are cell membrane, cytoplasm and _____________.
Question 832 :
In leaves, name the cell organelle that is responsible for green colour
Question 838 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d04af59b460d7261f2c0.PNG' />
The table given above has certain terms and four blank spaces named A, B, C and D. From the options given choose the correct combination of terms
Question 839 :
Majority of cells cannot be seen directly with our naked eyes because
Question 844 :
The boundary of the onion cell is the ___________ covered by another thick covering called the ___________.
Question 845 :
State whether true of false, “Unicellular organisms do not respire, only multicellular organisms respire”
Question 846 :
State True or False for the following statement:-
The size of the cells has no relation with the size of the body of the animal or plant.
Question 850 :
Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is
Question 851 :
The first step before growing crops is _____________ of the soil.
Question 852 :
If the harvested grains are to be kept for longer time, they should be safe from?
Question 854 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0cef59b460d7261f364.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (5) Certain plants of the same kind grown on a large scale.
Question 856 :
Plants make their own food by a process called Photosynthesis. True/False?
Question 858 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0ccf59b460d7261f361.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (3) A machine used for cutting the matured crop?
Question 859 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0cbf59b460d7261f360.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (6) A process of separating the grain from chaff.
Question 861 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0cdf59b460d7261f363.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (2) Keeping crop grains for a long time under proper conditions.
Question 865 :
What is the name of a simple tool which is used for removing weeds and for loosening the soil?
Question 866 :
Do Continuous cultivation of crops makes the soil good in nutrients ?
Question 867 :
The supply of water to crops at regular intervals is called irrigation. (True or False)
Question 868 :
The crops which are sown in the rainy season are called as ?
Question 869 :
How soil gets affected by the continuous plantation of crops in a field?
Question 871 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0caf59b460d7261f35e.JPG' />
From the above image, Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
Question 873 :
What are the substances which are added to the soil in the form of nutrients for the healthy growth of plants ?
Question 876 :
Water is essential because germination of seeds does not take place under dry conditions. (True or False)
Question 877 :
What it is the best technique for watering fruit plants, gardens and trees?
Question 878 :
Is Levelling the field beneficial for sowing as well as for irrigation ?
Question 879 :
Weeds are also controlled by using certain chemicals, called weedicides. (True or False)
Question 880 :
The ploughed field may have big clumps of soil what it is known as?
Question 882 :
In order to provide food for a large population— regular production, proper management and distribution is necessary. TRUE OR FALSE?
Question 883 :
What is very useful for lawns, coffee plantation and several other crops?
Question 884 :
Farmers with small holdings of land do the separation of grain and chaff, this process is known as ?
Question 885 :
In a field many other undesirable plants may grow naturally along with the crop. These undesirable plants are called?
Question 887 :
For growing a crop, sufficient sunlight , Water and_____________ from the soil are essential.
Question 888 :
The organic substance obtained from decomposition of dead plants or animal wastes is called _____
Question 889 :
The energy from the food is utilised by organisms for carrying out their various body functions. The functions are ?
Question 890 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0ccf59b460d7261f362.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (4) A rabi crop that is also one of the pulses.
Question 892 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0caf59b460d7261f35f.JPG' />
From the above image, Complete the following word puzzle with the help of clue. (1) Providing water to the crops
Question 893 :
The large scale storage of grains to protect them from pests are stored in ?
Question 896 :
If wheat is sown in the kharif season, what would happen?
Question 897 :
The crops grown in the winter season (October to March) are called ?
Question 898 :
Which system is more useful on the uneven land where sufficient water is not available?
Question 899 :
Which of the following is an example of rabi crop ?
Question 900 :
What is the process of loosening and turning the soil called?
Question 902 :
In the light of the availability of various resources in nature, natural resources can be broadly classified into how many kinds ?
Question 903 :
The whole process of formation of coal from dead vegetation is known as
Question 909 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0c6f59b460d7261f35a.jpg' />
What does the above image shows ?
Question 911 :
________ gas obtained from natural gas, is used in the production of fertilisers (urea).
Question 912 :
Now a days, ______ is used as a source of heat rather than light.
Question 914 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0c8f59b460d7261f35c.PNG' />
In the above image ______ is shown.
Question 917 :
Many useful substances are obtained from petroleum and natural gas. These are termed as -
Question 918 :
CNG is more polluting fuel than petrol. State true or false.
Question 921 :
Coal tar is a mixture of various substances. State true or false.
Question 922 :
Which of the below options describes 'coal tar' the best ?
Question 924 :
Coal is processed in industry to get some useful products such as -
Question 928 :
It is a mixture of about 200 substances. What is it ?
Question 929 :
What will be the results of using fossil fuels only when absolutely necessary ?
Question 932 :
Fossil fuels can be made in the laboratory. State true or false.
Question 933 :
Natural fuels formed from the dead remains of living organisms (fossils) are known as fossil fuels. TRUE or FALSE ?
Question 935 :
Naphthalene balls used to repel moths and other insects are obtained from -
Question 936 :
These days, _____ , a petroleum product, is used in place of coal-tar for metalling the roads.
Question 939 :
The slow process of conversion of dead vegetation into coal is called carbonisation. True or false ?
Question 940 :
Petrol and diesel are obtained from a natural resource called _____ .
Question 941 :
Can coal, petroleum and natural gas be prepared in the laboratory from dead organisms?
Question 943 :
Coal gas is obtained during the processing of coal to get coke. Is the given statement true ?
Question 944 :
CNG is now being used as a fuel for transport vehicles because
Question 946 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0c7f59b460d7261f35b.PNG' />
In the above image ______ is shown.
Question 947 :
When heated in air, coal burns and produces mainly _______ gas.
Question 948 :
The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called
Question 950 :
Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Use the tester to test whether distilled water conducts electricity or not.
Question 953 :
There are two wires (called leads) attached to an LED. One lead is slightly longer than the other. TRUE or FALSE?
Question 954 :
A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery?
Question 955 :
Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. Does distilled water conduct electricity?
Question 957 :
Iron is used in bridges and automobiles to provide strength. However, iron tends to corrode and rust. So, a coating of ____ is deposited on iron to protect it from corrosion and formation of rust.
Question 958 :
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the negative terminal of the battery. TRUE or FALSE?
Question 959 :
Why the bulb glows when the electric current passes through it?
Question 960 :
The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called _________.
Question 961 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0c4f59b460d7261f356.PNG' />
In the above figure, name the liquid(s), which when tested in the manner, may cause the magnetic needle to deflect.
Question 962 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0c0f59b460d7261f351.PNG' />
In the above figure, an activity is shown. We will need copper sulphate and two copper plates of size around 10 cm × 4 cm. Take 250 mL of distilled water in a clean and dry beaker. Dissolve two teaspoonfuls of copper sulphate in it. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. Clean copper plates with sand paper. Now rinse them with water and dry them. Connect the copper plates to the terminals of a battery and immerse them in copper sulphate solution figure. Allow the current to pass for about 15 minutes. Now remove the electrodes from the solution and look at them carefully. Do you find a coating over it?
Question 963 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bdf59b460d7261f34d.PNG' />
In the above figure, activity is shown. Take out carbon rods carefully from two discarded cells. Clean their metal caps with sand paper. Wrap copper wires around the metal caps of the carbon rods and join them to a battery Pour a cupful of water in a glass/plastic bowl. Add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. Now immerse the electrodes in this solution. Make sure that the metal caps of the carbon rods are outside the water. Wait for 3-4 minutes. Observe the electrodes carefully. Do you notice any gas bubbles near the electrodes?
Question 964 :
A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
Question 968 :
LED's have longer lifetime than light bulbs and fluorescent tubes. TRUE or FALSE?
Question 970 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bef59b460d7261f34e.PNG' />
In the above figure, an activity is shown. Collect a few small plastic or rubber caps of discarded bottles and clean them. Pour one teaspoon of lemon juice or vinegar in one cap. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in figure. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Does lemon juice or vinegar conduct electricity?
Question 971 :
When an electric current flows through a conducting solution, does it produce an effect on the solution?
Question 972 :
The passage of an electric current through a solution causes ______________ effects.
Question 973 :
The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. Is the definition correct ?
Question 976 :
The process of depositing a layer of any desired metal on another material by means of electricity is called ...........................
Question 977 :
Most liquids that do not conduct electricity are solutions of acids, bases and salts. TRUE or FALSE?
Question 979 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0bff59b460d7261f34f.PNG' />
In the above figure, an activity is shown. Collect a few small plastic or rubber caps of discarded bottles and clean them. Pour one teaspoon of lemon juice or vinegar in one cap. Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in figure. Take care that the ends are not more than 1 cm apart but at the same time do not touch each other. Does the bulb of the tester glow?
Question 980 :
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour?
Question 982 :
A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transfered to the thin copper plate. Which electrode should be attached to the positive terminal of the battery?
Question 984 :
Most liquids that conduct electricity are solutions of ......................... , ...................... and .......................
Question 986 :
Tin cans used for storing food, are made by electroplating of
Question 987 :
If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the.........................terminal of the battery.
Question 988 :
Most liquids that conduct electricity are solutions of ____________, ______________ and ______________.
Question 989 :
Why is it not preferred to make a whole object out of chromium ?
Question 990 :
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour?
Question 994 :
The passage of an electric current through a conducting solution causes chemical reactions. As a result -
Question 995 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1ad678c526e972caf080.PNG' />
Name three liquids, which when tested in the manner shown in the above figure, may cause the magnetic needle to deflect.
Question 996 :
When salt is dissolved in distilled water, we obtain salt solution. This is a insulator of electricity. TRUE or FALSE?
Question 998 :
From space, the Earth appears ____ due to the reflection of light from water and landmass on its surface.
Question 999 :
The period of revolution ______ as the distance of the planet ____ from the sun.
Question 1002 :
True or False. Venus has its own moon or satellite of its own.
Question 1004 :
The time taken by a planet to complete one rotation is called its ____
Question 1005 :
Constellations were devised by ancient people to be able to recognise _____in the sky.
Question 1006 :
____ is the main source of heat and light for all the planets.
Question 1007 :
One of the most famous constellations which can be seen during summer in the early part of the night is_____
Question 1011 :
The Sun and the celestial bodies which revolve around it form the _______
Question 1012 :
A celestial body that revolves around a planet is known as __________.
Question 1016 :
Which star is situated in the direction of the earth’s axis and does not appear to move?
Question 1019 :
There is a large gap in between the orbits of Mars and Jupiter.This gap is occupied by a large number of small objects that revolve around the Sun. These are called_______
Question 1020 :
The stars forming a group that has a recognisable shape is called a ______
Question 1023 :
At night, when the sky is clear and the moon is not there, sometimes bright streaks of light in the sky can be seen. These are commonly known as_______, although they are not stars. They are called _____
Question 1032 :
_______ is another prominent constellation in the northern sky. It is visible during winter in the early part of the night
Question 1033 :
There are many man-made satellites revolving round the Earth. These are called ____
Question 1037 :
In ancient times, passage of sun, stars, moon and planets in the sky helped our ancestors to device_____
Question 1038 :
A meteor is usually a small object that occasionally enters the ______atmosphere
Question 1039 :
There are____ stars in the handle of the ladle and_____ in its bowl
Question 1040 :
Solar system consists of ____ number of bodies such as planets, comets, asteroids and meteors.
Question 1042 :
The work of Aryabhata on astronomy can be found in his writing _____
Question 1044 :
Till 2006, ______ was consider the farthest planet from the Sun.
Question 1045 :
The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accomodate?
Question 1047 :
Indian Space Research Organisation (ISRO) launched _______, India’s first Mars orbiter mission on November 5, 2013
Question 1048 :
Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. They are called -
Question 1049 :
Microorganisms are classified into four major groups. True or false ?
Question 1050 :
Blue green algae fix __________ directly from air and enhance fertility of soil.
Question 1052 :
The process of conversion of sugar into alcohol is known as -
Question 1053 :
_____ can be seen with the help of a magnifying glass.
Question 1061 :
_______ is/are also helpful for fermentation of rice idlis and dosa batter.
Question 1064 :
Microbial diseases that can spread from an infected person to a healthy person through air, water, food or physical contact are called -
Question 1069 :
Serious diseases like polio and chicken pox are caused by viruses. Is this true ?
Question 1072 :
Yellow vein mosaic of bhindi (Okra), a plant disease is caused by ______.
Question 1074 :
There are some insects and animals which act as carriers of disease causing microbes. Examples of carriers among the following is/are -
Question 1076 :
Some bacteria are able to fix nitrogen from the atmosphere to enrich soil with nitrogen and increase its fertility. These microbes are commonly called -
Question 1082 :
______ reproduce only inside the cells of the host organism, which may be a bacterium, plant or animal.
Question 1084 :
Who discovered the bacterium (Bacillus anthracis) which causes anthrax disease ?
Question 1085 :
Foot and mouth disease of cattle is caused by a -
Question 1090 :
The medicines that kill or stop the growth of the disease-causing microorganisms are called -
Question 1092 :
Common ailments like cold, influenza (flu) and most coughs are caused by _________.
Question 1093 :
Microorganisms have been used for the production of alcohol since ages. Is the statement correct ?
Question 1094 :
Rust of wheat is a plant disease caused by fungi. Its mode of transmission is _____.
Question 1095 :
Viruses are also microscopic but are different from other microorganisms. True or false ?
Question 1098 :
Complete the reaction, $ Magnesium (Mg) + Oxygen (O_2 ) → $ ?
Question 1100 :
The property of metals by virtue of which they can be drawn into wires is called ductility. True or False
Question 1102 :
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Question 1106 :
Why Immersion rods for heating liquids are made up of metallic substances?
Question 1108 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. Find the nature of the gas.
Question 1112 :
A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.
Question 1114 :
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is
Question 1116 :
The property of metals producing a ringing sound when struck is called?
Question 1117 :
What happens when Iron nails are placed in copper sulphate solution?
Question 1120 :
Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?
Question 1121 :
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Question 1122 :
Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?
Question 1128 :
Name the major non-metals which are present in fertilisers and enhance the growth of plants.
Question 1131 :
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?
Question 1132 :
On burning, metals react with oxygen to produce metal oxides which are basic in nature. Non-metals react with oxygen to produce non- metallic oxides which are acidic in nature.
Question 1134 :
Phosphorus is a very reactive non-metal. It catches fire if exposed to air, to prevent the contact of phosphorus with atmospheric oxygen, it is stored in _______
Question 1136 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d084f59b460d7261f309.PNG' />
From the above image, fill in the blank. Metals are good __________ of electricity.
Question 1137 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. Find the nature of the gas.
Question 1138 :
A more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal. TRUE/FALSE
Question 1139 :
The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas.
Question 1140 :
Is it TRUE OR FALSE, Sodium is a very reactive metal?
Question 1141 :
Which of the following property is not responsible for copper to be used as electrical conduction wires?
Question 1142 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d082f59b460d7261f307.PNG' />
From the image above, find out the names of three metals
Question 1147 :
Is it TRUE OR FALSE, Sodium is a very reactive metal?
Question 1149 :
What is the permanent solution for the problem of deforestation ?
Question 1153 :
Paheli is curious to know the purpose of making national parks, wildlife sanctuaries and biosphere reserve. What is the purpose of making national parks, wildlife sanctuaries and biosphere reserves?
Question 1154 :
Paheli has heard that some of the endemic species may vanish. Is it true?
Question 1158 :
What type of waste is woollen clothes , what is the approximate time taken to degenerate and what is the nature of material?
Question 1159 :
A synthetic fibre is a _____ of small units joined together.
Question 1160 :
Metals like iron get rusted when left exposed to moisture and air. Do plastics too react with water and air and get corroded?
Question 1161 :
State True or False. Synthetic fibres are also called Man-made fibre.
Question 1163 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0e9f59b460d7261f389.JPG' />
Refer to the image. The articles are made of ____.
Question 1164 :
Are sweaters and shawls and blankets made from natural wool ?
Question 1165 :
The biodegradable and nonbiodegradable wastes should be collected separately and disposed off _________.
Question 1166 :
What type of waste is peels of vegetables anf fruits, leftover foodstuffs etc. and what is the nature of material?
Question 1167 :
_____ is a special plastic on which oil and water do not stick. It is used for non-stick coating on cookwares.
Question 1171 :
A material which is not easily decomposed by natural processes is termed_______
Question 1173 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0e8f59b460d7261f388.JPG' />
Refer to the image. The articles are made of ____.
Question 1174 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0e7f59b460d7261f387.jpg' />
From the above figure, identify the (a)___ and (b)____ arrangement.
Question 1175 :
Nylon fibre is really so strong that we can make nylon ____ and ____ for rock climbing.
Question 1176 :
Being lighter as compared to metals, what are used in cars, aircrafts and spacecrafts?
Question 1180 :
Categorise the materials of the following products into 'can be recycled' and 'cannot be recycled Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches. How many of them can not be recycled?
Question 1186 :
_______ is a versatile material which resists fire and can tolerate heat better than other plastics.
Question 1188 :
What type of waste is plastic bags , what is the approximate time taken to degenerate and what is the nature of material?
Question 1189 :
Clothes made from acrylic are relatively _______from those made from wool.
Question 1191 :
What are the other ways in which you can contribute towards reducing the use of plastic materials?
Question 1192 :
Nylon fibre was prepared from coal, water and air. Was it the first fully synthetic fibre?
Question 1193 :
Many small units combine to form a large single unit called ____.
Question 1194 :
What type of waste is cotton cloth , what is the approximate time taken to degenerate and what is the nature of material?
Question 1196 :
What type of waste is tin, aluminium, and other metal cans , what is the approximate time taken to degenerate and what is the nature of material?
Question 1197 :
Sweaters and shawls or blankets in the winter are actually not made from natural wool, these are prepared from another type of synthetic fibre called ____.
Question 1198 :
What type of waste is paper , what is the approximate time taken to degenerate and what is the nature of material?
Question 1199 :
A material which gets decomposed through natural processes, such as action by bacteria, is called______
Question 1200 :
Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material?
Question 1202 :
_____ are made from fibres obtained from natural or artificial sources.
Question 1204 :
There are some plastics which when moulded once, can not be softened by heating. Such plastic is called as _____.
Question 1209 :
Give reason why: Aluminium foils are used to wrap food items.
Question 1210 :
Which of the following is related to the uses of copper?
Question 1214 :
Paheli: I heard that magnesium is found in plants. In what form is it found in them?
Question 1215 :
State true or false: Copper displaces zinc from zinc sulphate solution.
Question 1217 :
Bhoojho: Doctor reported iron deficiency in my body. Where is iron in my body?
Question 1219 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. What would be the nature of the gas?
Question 1222 :
Which of the following is related to the uses of gold?
Question 1223 :
Which of the following is related to the uses of carbon?
Question 1224 :
Which of the following is related to the uses of aluminium?
Question 1225 :
Which of the following is related to the uses of iron?
Question 1227 :
Which of the following is related to the uses of mercury?
Question 1229 :
In order to meet the ever-increasing demand in factories and for shelter, trees are being continually cut. Is it justified to cut trees for such projects ?
Question 1231 :
The area in which variety of plants, animals and microorganisms are found is called
Question 1233 :
The source book that maintains an international list of all endangered animal and plant species is called -
Question 1235 :
State whether the statement is true or false : Migration refers to the movement of an organism or a group of organisms from its natural habitat to another place at a particular time every year.
Question 1236 :
Species found only in a particular area are known as __________.
Question 1237 :
Migratory birds fly to far away places because of ____________ changes.
Question 1239 :
State TRUE or FALSE: Protected forests are also not completely safe for wild animals.
Question 1246 :
A place where animals are protected in their natural habitat is called a __________.
Question 1248 :
Indicate whether the following statement is True (T) or False (F): The basic living unit of an organism is an organ.
Question 1249 :
State TRUE or FALSE: Cells are the basic structural units of living organisms.
Question 1253 :
State TRUE or FALSE: Chloroplasts are found in both plant and animal cells.
Question 1254 :
State TRUE or FALSE: Chromosomes play an important role in the inheritance of characters.
Question 1257 :
Indicate whether the following statement is True (T) or False (F): Amoeba has an irregular shape.
Question 1260 :
___________ separates the contents of the cell from the surrounding medium.
Question 1261 :
Indicate whether the following statement is True (T) or False (F): Muscle cells are branched.
Question 1263 :
State TRUE or FALSE: Chromosomes carry genes that help in the transfer of characters from parents to the offspring.
Question 1264 :
Indicate whether the following statement is True (T) or False (F): Unicellular organisms have one-celled body.
Question 1269 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas?
Question 1270 :
State True or False: Copper displaces zinc from zinc sulphate solution.
Question 1271 :
Give reasons that why sodium and potassium are stored in kerosene.
Question 1272 :
Fill in the blanks: Based on appearance, metals are _____ and non-metals are _____ in nature.
Question 1273 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. What is the nature of the gas.
Question 1276 :
Fill in the blanks: Based on ductility, metals are _____ and non-metals are _____ in nature.
Question 1278 :
Give reasons that why immersion rods for heating liquids are made up of metallic substances.
Question 1279 :
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. Name the gas evolved.
Question 1280 :
Give reasons that why aluminium foils are used to wrap food items.
Question 1282 :
Fill in the blanks: Based on malleability, metals are _____ and non-metals are _____ in nature.
Question 1283 :
Write the equation of reaction involving the reaction of copper plate and sulphuric acid.
Question 1284 :
Fill in the blanks: Metals are _____ conductors of heat and ______.
Question 1287 :
Write the equation of reaction involving the reaction of iron and copper sulphate.
Question 1290 :
Fill in the blanks: Based on hardness, metals are _____ and non-metals are _____ in nature.
Question 1291 :
Fill in the blanks: Based on electrical conductivity, metals are _____ and non-metals are _____ in nature.
Question 1292 :
Fill in the blanks: Based on heat conduction, metals are _____ and non-metals are _____ in nature.
Question 1295 :
Fill in the blank: Metals react with acids to produce _____ gas.
Question 1301 :
Fill in the blank: Alcohol is produced with the help of ________.
Question 1305 :
Fill in the blanks: Microorganisms can be seen with the help of a________.
Question 1308 :
Fill in the blanks: Blue green algae fix _________ directly from air to enhance fertility of soil.
Question 1314 :
When a glass rod is rubbed with a piece of silk cloth, the rod :
Question 1315 :
State TRUE or FALSE : Lightning conductor cannot protect a building from lightning.
Question 1316 :
State TRUE or FALSE : A charged glass rod attracts a charged plastic straw.
Question 1318 :
An earthquake measures 3 on Richter scale. Is it likely to cause much damage?
Question 1319 :
The scale on which the destructive energy of an earthquake is measured is:
Question 1321 :
State TRUE or FALSE : Earthquakes can be predicted in advance.
Question 1322 :
An earthquake measures 3 on Richter scale. Would it be recorded by a seismograph?
Question 1323 :
The weather department has predicted that a thunderstorm is likely to occur an a certain day. Suppose you have to go out on that day. Would you carry an umbrella?
Question 1324 :
State in India where earthquakes are more likely to strike is:
Question 1325 :
Suppose you are outside your home and an earthquake strikes. Which of the following you should not do to protect yourself?
Question 1330 :
State True or False:
There are nine planets in the solar system.
Question 1332 :
State True or False:
Uranus is the farthest planet in the solar system.
Question 1333 :
A place for Large areas of protected land for conservation of wild, plant and animal resources and traditional life of the tribals living in the area is known as ?
Question 1334 :
What affect the natural habitat of endemic species and endanger their existence?
Question 1335 :
To protect our flora and fauna and their habitats, protected areas called _______?
Question 1336 :
Why do migratory birds fly to far away areas every year during a particular time?
Question 1337 :
Which one of the following changes may occur due to desertification?
Question 1338 :
The plants found in a particular area is termed as ______ ?
Question 1339 :
Clearing of forests (by cutting down forest trees)over a wide area is called _______?
Question 1340 :
Which of the following is the first Reserve Forest of India?
Question 1342 :
State true or false. There can be a wildlife sanctuary within a biosphere reserve.
Question 1343 :
The increase in temperature on the earth disturbs the water cycle and may reduce rainfall. This could cause __________?
Question 1345 :
Which of the following feature is correct for a wildlife sanctuary?
Question 1346 :
Do Migratory birds fly for laying eggs as the weather in their natural habitat becomes very cold and inhospitable?
Question 1347 :
State true or false. Plants of a particular area are collectively termed as fauna.
Question 1349 :
What will happen if the top layer of the soil is exposed?
Question 1350 :
State true or false. Deforestation leads to an increase in the water holding capacity of the soil.
Question 1351 :
In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to ________.
Question 1352 :
State true or false. Bison is an endemic fauna of Pachmarhi Biosphere Reserve.
Question 1353 :
Red Data Book is the source book which keeps a record of all the____________ animals and plants?
Question 1355 :
What are the examples of endemic flora of the Pachmarhi Biosphere Reserve?
Question 1356 :
Endemic species are those species of plants and animals which are found exclusively in a particular area. Is it TRUE OR FALSE?
Question 1358 :
Project Tiger was launched by the government to protect the tigers in the country. What was the objective of this project ?
Question 1359 :
Migratory birds fly to far away areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour? (i) Unavailability of food. (ii) Extreme weather conditions. (iii) Over crowding. (iv) Lack of nesting areas.
Question 1360 :
Animals whose numbers are diminishing to a level that they might face extinction are known as the ________ ?
Question 1361 :
Can a forest regenerate naturally in a short period of time?
Question 1363 :
What do black buck, elephant, python and golden cat together represent in a forest?
Question 1364 :
The other properties of the soil like nutrient content, texture etc., also change because of deforestation. TRUE OR FALSE ?
Question 1365 :
Removal of the top layer of the soil exposes the lower, hard and rocky layers. This soil has less humus and is less fertile. Gradually the fertile land gets converted into deserts. It is called __________?
Question 1366 :
Which one of the following statements is true about endemic species?
Question 1367 :
An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, river deltas etc? Is it TRUE OR FALSE.
Question 1368 :
The animals found in a particular area is termed as ______ ?
Question 1370 :
The place meant for conservation of biodiversity in their natural habitat are: (i) Zoological garden (ii) Botanical garden (iii) Wildlife sanctuary (iv) National park.
Question 1371 :
__________ is restocking of the destroyed forests by planting new trees.
Question 1372 :
The Red Data Book keeps a record of which of the following: (i) endemic species. (ii) extinct species. (iii) endangered plants. (iv) endangered animals.
Question 1374 :
A place reserved for wild life where they can freely use the habitats and natural resources is known as?
Question 1376 :
A place where animals are protected in their natural habitat is known as?
Question 1377 :
Which one of the following statements is true about a biosphere reserve?
Question 1380 :
What is that part of the earth in which living organisms exist or which supports life?
Question 1381 :
If cutting of trees continues,rainfall and the fertility of the soil will decrease.TRUE or FALSE
