Question 1 :
Long, fine continuous thread or filaments are obtained from plants and animals is called______
Question 5 :
Paheli wants to know if the cotton thread and silk thread are spun and woven in Ihe same manner.
Question 10 :
Out of the following, which are the two terms related to silk production? Sericulture, floriculture, moriculture, apiculture and silviculture
Question 12 :
State True or False: Yalk hair are not used to make woollen fabric.
Question 15 :
Wool fibre cannot be obtained from which of the following ?
Question 20 :
Boojho is wondering why it hurts when someone pulls his hair but not when he goes for a haircut?
Question 23 :
The Process of selecting parents for obtaining special characters in their offspring is termed as
Question 26 :
Some words related with silk are jumbled up. Choose the correct option 1. RINGLEE
Question 27 :
In the processing of wool from sheep, the sheared skin with hair is thoroughly washed in tanks to remove grease, dust and dirt. This is called
Question 28 :
State True or False: In the process of obtained wool from fleece, sorting is done after scouring.
Question 29 :
Some words related with silk are jumbled up. Choose the correct option: 1. TURECULRISE
Question 31 :
Out of the following, which are the two terms related to silk production ?
Question 33 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb69f59b460d7261ec31.PNG' />
A whole sale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Choose the correct option to match the items in Column A with the woollen fibres in Column B.
Question 35 :
Boojho is wondering why it hurts when someone pulls his hair but not when he goes for a haircut?
Question 39 :
Boojho is wondering why a cotton garment cannot keep us as warm in winter as a woollen sweater does?
Question 40 :
In the processing of wool from sheep, after scouring, the hairy skin is sent to a factory where hair of different textures are separated or sorted. This is called
Question 45 :
You must be familiar with the following nursery rhymes:
(1) 'Baa baa black sheep, have you any wool.'
(2) 'Mary had a little lamb, whose fleece was white as snow.'
Which parts of the black sheep have wool ?
Question 46 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1ab678c526e972caf02f.PNG' />
Figure shows three rings of circles with letters in them. Some of these letters in each ring can form the name of one wool yielding animal. Find the names of animals.
Question 47 :
Choose the correct option for : Its leaves are eaten by silkworms
Question 48 :
Which of the following animals in different regions are reared for obtaining wool ?
Question 50 :
Which country's sheep are known best to yield the best wool?
Question 53 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4af59b460d7261ec16.PNG' />
The above figure shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in test tube A? Nature of solution A is neutral.
Question 54 :
Name a natural indicator which gives pink colour in basic solution.
Question 56 :
Calamine can be used to treat ant’s sting. True or False?
Question 58 :
When an acidic solution is mixed with a basic solution, they ___ each other forming ___ and water.
Question 61 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4ff59b460d7261ec19.PNG' />
The above figure shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in test tube D? Nature of solution D is neutral.
Question 62 :
Name the solution which does not change the colour of either
red or blue litmus.
Question 63 :
Look at the given reaction. $Hydrochloric acid + Sodium hydroxide (base) \rightarrow Sodium chloride (salt) + Water$. Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from this solution? Suggest a method (if any).
Question 64 :
‘Litmus’, a natural dye is an extract of which of the following?
Question 65 :
The correct way of making a solution of acid in water is to ___.
Question 66 :
Common salt dissolved in water turns blue litmus red. True or False?
Question 67 :
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?
Question 68 :
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ___.
Question 69 :
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
Question 70 :
A compound if acidic will turn all indicators red. True or False?
Question 71 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4ef59b460d7261ec18.PNG' />
The above figure shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in test tube B? Nature of solution B is basic.
Question 72 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb44f59b460d7261ec0e.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when
you put a piece of blue litmus paper in test tube B?
Question 73 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb4bf59b460d7261ec17.PNG' />
The above figure shows solutions taken in test tubes A,B,C and D. What colour is expected when a piece of red litmus paper is dropped in test tube C? Nature of solution C is acidic.
Question 75 :
Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?
Question 76 :
What is responsible for increase in temperature during a neutralisation reaction?
Question 78 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb47f59b460d7261ec12.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a piece of red litmus paper in test tube C?
Question 79 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb48f59b460d7261ec13.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a few drops of phenolphthalein solution to test tube A?
Question 80 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb46f59b460d7261ec11.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a piece of red litmus paper in test tube B?
Question 81 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb43f59b460d7261ec0d.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when
you put a piece of blue litmus paper in test tube A?
Question 85 :
What is the colour of blue litmus paper in lemon juice?
Question 86 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb49f59b460d7261ec14.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a few drops of phenolphthalein solution to test tube C?
Question 88 :
What is used to test whether a substance is acidic or basic?
Question 92 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb45f59b460d7261ec0f.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when
you put a piece of blue litmus paper in test tube C?
Question 96 :
A solution changes the colour of turmeric indicator from yellow to red. The solution is ___.
Question 97 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb49f59b460d7261ec15.jpg' />
The above figure shows three test tubes A,B and C with different liquids. What will you observe when you put a few drops of phenolphthalein solution to test tube B?
Question 98 :
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
Question 99 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd5f59b460d7261ecb0.jpg' />
In the above figure , will the compass needle show deflection when the switch in the circuit is closed?
Question 100 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd6f59b460d7261ecb1.jpg' />
As shown in the above figure , Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit .
Question 101 :
The safety device based on the heating effect of electric current is called a _____________.
Question 103 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd6f59b460d7261ecb1.jpg' />
As shown in the above figure , Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit .
Question 105 :
Choose the statement which is correct in the case of an electric fuse.
Question 106 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbc8f59b460d7261ec9e.jpg' />
Would the bulb glow in the above electric circuit?
Question 107 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd4f59b460d7261ecae.jpg' />
In the circuit shown in the above figure, would any of the bulb glow when the switch is in the ‘OFF’ position?
Question 108 :
Which of the following is the correct symbol of a battery?
Question 109 :
When the current flows through a wire, does the wire behave like a magnet?
Question 113 :
Which device is used as a safety device which prevents damages to electrical circuits and possible fires?
Question 114 :
Choose the statement which is correct in the case of an electric fuse.
Question 115 :
The wire gets hot when an electric current passes through it. What is this effect called as?
Question 117 :
When an electric current flows through a wire , the wire gets _____ .
Question 118 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb53f59b460d7261ec1b.PNG' />
Three bulbs A, B, C are connected in a circuit as shown in figure. When the switch is ‘ON’
Question 119 :
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
Question 120 :
Choose the statement which is correct in the case of an electric fuse.
Question 121 :
Which of the following is the correct symbol of a battery?
Question 123 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcaf59b460d7261eca0.jpg' />
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1abd78c526e972caf042.jpg' />
The image above shows two circuit diagrams. Are the images identical to each other ?
Question 124 :
Which of the following is the correct symbol of an electric cell?
Question 127 :
Name any electric appliance where the heating effect of the electric current is used?
Question 128 :
An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response .
Question 129 :
Which of the following is the correct symbol of a switch in OFF position?
Question 132 :
A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. State true or false .
Question 134 :
In an electric circuit a fuse is a ________ to prevent possible fire.
Question 135 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd5f59b460d7261ecaf.jpg' />
In the circuit shown in the above figure, what will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?
Question 138 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?
Question 139 :
Longer line in the symbol for a cell represents its ___________terminal.
Question 141 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcaf59b460d7261eca0.jpg' />
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1abd78c526e972caf042.jpg' />
The image above shows two circuit diagrams. Are the images identical to each other ?
Question 142 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb50f59b460d7261ec1a.PNG' />
When an electric current flows through a wire AB as shown in the figure, the wire?
Question 144 :
What property of conducting wires is ideal for making electric fuses?
Question 146 :
When an electric current flows through a wire, it behaves like a magnet. State true or false .
Question 147 :
Choose the statement which is correct in the case of an electric fuse.
Question 149 :
_______ visit flowers and carry away pollen on their bodies .
Question 150 :
State True or false: Generally , pollen grains have a tough protective coat which prevents them from drying up.
Question 154 :
State True or False: Under favourable conditions, a spore germinates and develops into new individual.
Question 155 :
Plants produced from vegetative propagation take less time to grow, and bear flowers and fruits earlier than those produced by ______ .
Question 156 :
Can each bud in the leaf of bryophyllum grow into new plant ?
Question 157 :
Vegetative propagation takes less time to ____ and _______ earlier than those produced from seeds .
Question 159 :
In what type of reproduction plants are produce from roots, stems, leaves and buds ?
Question 160 :
Scars present on potato which have buds in them are called ?
Question 161 :
Among these plants which plant can produce new plants when their parts get detached from the main plant?
Question 163 :
The new plants generated by vegetative propagation are exact copies of their parents as they are produced from ________ .
Question 164 :
State True or False: The vegetative buds can also give rise to new plants.
Question 165 :
A bud consists of a short stem around which _______ are present.
Question 166 :
Example of roots of some plants that can give rise to new plants :
Question 168 :
Production of new individuals from the vegetative part of parent is called ______.
Question 174 :
_____ is transfer of pollen to stigma of the same flower.
Question 175 :
______ is the transfer of pollen to stigma of another flower of same plant or another of plant of same kind.
Question 177 :
The fusion of male and female gametes is termed as _____.
Question 183 :
A flower may have either male or female reproductive parts. Such a flower is called _____.
Question 184 :
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____.
Question 185 :
_____ does not involve the fusion of male and female gametes.
Question 187 :
The process of fusion of the male and the female gametes is called _____.
Question 191 :
Boojho had the following parts of a rose plant-a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?
Question 192 :
The transfer of pollen grains of a flower to the stigma of same flower or that of a different flower of the same kind is called ______.
Question 193 :
_____ is defined as the splitting of a mature cell into two cells of the same type.
Question 194 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc1bf59b460d7261ed0a.jpeg' />
In the above figure, which type of pollination does the figure indicate?
Question 195 :
______is defined as the production of a new individual from a body part like leaves, stems and roots.
Question 196 :
The fusion of male nucleus (male gamete) with that of egg cell (female gamete) is known as ______.
Question 197 :
The breaking of the body into two or more parts is called ______.
Question 198 :
Coconut is a large and heavy fruit.Statement is true or false.
Question 199 :
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Question 200 :
State true or false. Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.
Question 201 :
Special type of substances used to test whether a substance is acidic or basic are called-
Question 206 :
Boojho added dilute sulphuric acid to lime water. Will the reaction mixture become hot or cool?
Question 207 :
State true or false. Change of colour in an acid and a base depends on the type of the indicator.
Question 208 :
Why calamine solution is applied on the skin when an ant bite?
Question 209 :
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Question 210 :
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution?
Question 211 :
Curd, lemon juice, orange juice and vinegar taste sour because they contain ___________.
Question 214 :
State true or false. Indicator is a substance which shows different colours in acidic and basic solutions
Question 215 :
State true or false. If an indicator gives a colour change with an acid, it does not give a change with a base.
Question 216 :
State true or false. Both acids and bases change colour of all indicators.
Question 217 :
When an acidic solution is mixed with a basic solution, both the solutions neutralise the effect of each other. What is this process called?
Question 218 :
State true or false. If an indicator changes colour with a base, it does not change colour with an acid.
Question 223 :
Tooth decay is caused by the presence of a base. State true or false.
Question 225 :
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
Question 227 :
The nature of bitter and soapy substances is said to be -
Question 228 :
Why is an antacid tablet taken when you suffer from acidity?
Question 229 :
Indicator is a substance which shows different colours in acidic and basic solutions. State true or false.
Question 230 :
Why factory waste is neutralised before disposing it into the water bodies?
Question 232 :
The substances which are neither acidic nor basic are called -
Question 233 :
Substances which are bitter in taste and feel soapy on touching are known as -
Question 235 :
State true or false. Tooth decay is caused by the presence of a base.
Question 236 :
In neutralisation reaction, a new substance is formed called as -
Question 237 :
Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
Question 239 :
Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. State true or false.
Question 243 :
Explain the function of bar screens in a wastewater treatment plant.
Question 244 :
The General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on “Water for life” on _________.
Question 246 :
In the year 2016, the Government of India has initiated a new mission known as___________.
Question 247 :
Who had said “No one need to wait for anyone else to adopt a humane and enlightened course of action.”?
Question 255 :
A skimmer removes the floatable solids like oil and grease. Water so cleared is called _________?
Question 256 :
Study the following statements about ozone:
a. It is essential for breathing of living organisms.
b. It is used to disinfect water.
c. It absorbs ultraviolet rays.
d. Its proportion in air is about 3%.
Which of these statements are correct?
Question 257 :
A network of big and small pipes that are used to take away the wastewater, called _____, forming the _______?
Question 259 :
What are the ways to minimise or eliminate waste and pollutants at their source?
Question 260 :
Why should oils and fats be not released in the drain? Explain.
Question 261 :
What are the cause of a large number of diseases by water?
Question 276 :
The General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on __________.
Question 279 :
Explain why sewage is harmful to discharge untreated sewage into rivers or seas?
Question 281 :
State True or False. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.
Question 282 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc0df59b460d7261ecf9.png' />
Will the compass needle show deflection when the switch in the circuit shown by figure given above is closed?
Question 283 :
State True or False. To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
Question 284 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc0ef59b460d7261ecfa.png' />
From the above circuit, what will be the order in which the bulbs A, B and C will glow when the switch is moved to the 'ON position?
Question 285 :
State True or False. The safety device based on the heating effect of electric current is called a fuse.
Question 286 :
State True or False. When current is switched 'on' in a room heater, it produces heat.
Question 287 :
State True or False. An electromagnet does not attract a piece of iron.
Question 288 :
State True or False. The combination of two or more cells is called a battery.
Question 289 :
Fill in the blanks. Longer line in the symbol for a cell represents its ___________terminal.
Question 290 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc10f59b460d7261ecfc.png' />
From the above circuit, would any of the bulb glow when the switch is in the 'OFF' position?
Question 292 :
How many times, on an average, does an adult human being at rest breathes in and out per minute?
Question 293 :
State whether true or false. The size of the chest cavity increases during inhalation.
Question 294 :
Take three test tubes. Fill $\frac{3}{4}$th of each with water. Label them A, B and C. Keep a snail in test tube A, a water plant in test tube B and in C, keep snail and plant both. Which test tube would have the highest concentration of $CO_2$?
Question 295 :
During heavy exercise, we get cramps in the legs due to the accumulation of
Question 297 :
During heavy exercise, we get cramps in the legs due to the accumulation of
Question 299 :
State whether true or false. The fish has lungs for respiration.
Question 304 :
A large, muscular sheet called ______ forms the floor of the chest cavity.
Question 311 :
State whether true or false. During heavy exercise the breathing rate of a person slows down.
Question 314 :
Normal range of breathing rate per minute in an average adult person at rest is:
Question 322 :
As a result of the improvement of blood circulation the supply of oxygen to the muscle cells _____.
Question 327 :
State whether true or false. Plants carry out photosynthesis only during the day and respiration only at night.
Question 330 :
Plants carry out photosynthesis only during the day and respiration only at night.
Question 334 :
State whether true or false. Frogs breathe through their skins as well as their lungs.
Question 336 :
During heavy exercise the breathing rate of a person slows down
Question 337 :
Small openings on the sides of the body of an insect is called ?
Question 341 :
Take three test-tubes. Fill $\frac {3}{4}th$ of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of $CO_2$ ?
Question 345 :
You must be familiar with the following nursery rhymes: (i) 'Baa baa black sheep, have you any wool.' (ii) 'Mary had a little lamb, whose fleece was white as snow.' Answer : Which part of the black sheep have wool?
Question 346 :
The silkworm is (i) a caterpillar, (ii) a larva. Choose the correct option.
Question 348 :
Out of the following, which are the two terms related to silk production? Sericulture, floricuture, moriculture, apiculture and silviculture.
Question 349 :
What health problems do workers in the silk industry suffer from?
Question 350 :
You must be familiar with the following nursery rhymes: (i) 'Baa baa black sheep, have you any wool.' (ii) 'Mary had a little lamb, whose fleece was white as snow.' Answer : What is meant by the white fleece of the lamb?
