Question 1 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb8ff59b460d7261ec5c.JPG' />
In the above figure, what is the nature of the lens?
Question 4 :
An image which is erect, virtual and is of the same size as the object is formed by ___________ mirror.
Question 7 :
An image formed by a lens is erect. Such an image could be formed by a :
Question 8 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbe4f59b460d7261ecc3.jpg' />
A person takes a concave mirror and holds it facing the Sun. He tries to get the light reflected by the mirror on a sheet of paper. Then, he adjusts the distance of the paper until you get a sharp bright spot on it as shown in the figure. Now, he holds the mirror and the sheet of paper steady for a few minutes. Does the paper start burning?
Question 9 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb7ef59b460d7261ec47.JPG' />
In the above figure, 1 is _____ in colour.
Question 10 :
A man walks towards a plane mirror. At what rate will his image move if the mirror is stationary?
Question 11 :
Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
Question 12 :
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from:
Question 14 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbe1f59b460d7261ecbf.jpg' />
A person takes a chess board. He fixes a plane mirror vertically on this line and places any small object, such as a pencil sharpner, at the boundary of the third square counting from the mirror as shown in the figure. He notes the position of the image. Now, he shifts the object to the boundary of the fourth square. Again he notes the position of the image. Will he find any relation between the distance of the image from the mirror and that of the object in front of it?
Question 16 :
Image formed by a convex __________ is always virtual and smaller in size.
Question 17 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbeaf59b460d7261eccb.jpg' />
A person takes a stainless steel spoon. He brings the outer side of the spoon near his face and looks into it as shown in the above figure. Is this image different from what he will see in a plane mirror?
Question 18 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb81f59b460d7261ec4a.JPG' />
In the above figure, 4 is _____ in colour.
Question 21 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbddf59b460d7261ecba.jpg' />
A person takes a torch covers its glass with a chart paper which has three narrow slits as shown in Figure above. He spreads a sheet of chart paper on a smooth wooden board and fixes a plane mirror strip vertically on the chart paper. Now, he directs the beam of light on the mirror from the torch with slits. He places the torch in such a way that its light is seen along the chart paper on the board. Now, he adjusts its position so that the light from the torch strikes the plane mirror at an angle. Now, he moves the torch slightly to either side. Does he find any change in the direction of reflected light?
Question 23 :
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
Question 25 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbdcf59b460d7261ecb9.jpg' />
A person takes a torch covers its glass with a chart paper which has three narrow slits as shown in Figure above. He spreads a sheet of chart paper on a smooth wooden board and fixes a plane mirror strip vertically on the chart paper. Now, he directs the beam of light on the mirror from the torch with slits. He places the torch in such a way that its light is seen along the chart paper on the board. Now, he adjusts its position so that the light from the torch strikes the plane mirror at an angle. Does the mirror change the direction of light that falls on it?
Question 26 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbe8f59b460d7261ecc8.jpg' />
A person takes a stainless steel spoon. He brings the outer side of the spoon near his face and looks into it as shown in the above figure. Is this image erect and the size of the image is the same, smaller or larger?
Question 27 :
In the case of mirrors that for different positions of the object the nature and size of the image change. Is it true for lenses also?
Question 28 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb7ff59b460d7261ec48.JPG' />
In the above figure, 2 is _______ in colour.
Question 29 :
If the reflecting surface is on the inner side, the mirror is called ____.
Question 30 :
We can obtain an enlarged and erect image by a convex mirror. (T/F)
Question 32 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb83f59b460d7261ec4d.JPG' />
In the above figure, 7 is _____ in colour.
Question 35 :
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
Question 36 :
The distance between the optical centre and the focus of a lens is called the ___ of the lens.
Question 39 :
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be:
Question 40 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb80f59b460d7261ec49.JPG' />
In the above figure, 3 is _____ in colour.
Question 41 :
The inner surface of a steel spoon acts as a ___ mirror.
Question 42 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb8bf59b460d7261ec57.PNG ' />
In the above figure, will the position of image change if position of object is changed ?
Question 44 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb8af59b460d7261ec56.PNG ' />
In the above figure, What are the characteristics of the image formed?
Question 45 :
Image formed wil always be virtual, erect and diminished in __________ mirror.
Question 48 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbdcf59b460d7261ecb8.jpg' />
A Person places a lighted candle in front of a plane mirror. He tries to see the flame of the candle in the mirror. It appears as if a similar candle is placed behind the mirror. The candle, which appears behind the mirror, is the image of the candle formed by the mirror as shown in the above figure. The candle itself is the object. Now, he moves the candle to different positions in front of the mirror. He observes the images in each case. Now, he places a vertical screen behind the mirror and tries to obtain the image of the candle on this screen. Can you get the image on the screen?
Question 49 :
We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
Question 50 :
The outer surface of a flat steel plate acts as a ___ mirror.
Question 51 :
Given is a characteristic of animal : Layer of fat under skin. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 52 :
'Diets heavy on fruits' is the characteristics of animal. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 53 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cc03f59b460d7261eceb.JPG' />
According to the above table, which state is hot and wet?
Question 55 :
When are the maximum and minimum temperatures likely to occur during the day?
Question 56 :
The daily weather report carries information about the temperature, humidity and rainfall during the past how many hours?
Question 58 :
The average weather pattern taken over a long time is called the ______ of the place.
Question 61 :
True or False. Animals living in very cold and hot climate must not possess special features to protect themselves against the extreme cold or heat.
Question 62 :
Which features adapt polar bears to live in extremely cold climate?
Question 63 :
Features and habits that help animals to adapt to their surroundings are a result of the process of _______
Question 64 :
'White fur' is the characteristics of animal. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 65 :
What type of tail do monkeys have to help them live on the trees?
Question 66 :
Do all the seven days have the same maximum and minimum temperatures, humidity and rainfall?
Question 67 :
What helps elephants to tear the bark of trees that they love to eat?
Question 68 :
Given is a characteristic of animal : Bright colours. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 69 :
Given is a characteristic of animal : Need to migrate. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 70 :
'Bright colours' is the characteristics of animal. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 71 :
Do all the seven days have the same maximum and minimum temperatures, humidity and rainfall?
Question 74 :
Fill in the blanks : A place receives very little rainfall and the temperature is high throughout the year, the climate of that place will be ______ and ______ .
Question 75 :
A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in
Question 79 :
True or False. The weather of a place remains the same day after day and week after week.
Question 80 :
Which features adapt polar bears to live in extremely cold climate?
Question 81 :
The temperature, humidity, and other factors are called the _______ of the weather.
Question 82 :
For how many months the sun does not set at the poles and does not rise for another six months in the polar regions?
Question 83 :
Which department of the Government collects data on temperature, wind, etc., and makes the weather prediction?
Question 84 :
Which features adapt polar bears to live in extremely cold climate?
Question 85 :
If the temperature at a place is high most of the time, then the climate of that place is-
Question 87 :
Do penguins too have a thick skin and a lot of fat to protect it from cold like polar bears?
Question 89 :
The average weather taken over a long time is called ___________.
Question 90 :
Which regions are covered with snow and is very cold for most part of the year?
Question 91 :
What do elephants use as nose because of which it has a strong sense of smell and also use it for picking up food?
Question 92 :
Can polar bears close its nostrils and can remain under water for long durations?
Question 93 :
'Wide and large paws' is the characteristics of animal. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 94 :
'Long and large beak' is the characteristics of animal. Indicate whether it is adaptation for tropical rainforests or polar regions.
Question 96 :
If there is heavy rainfall on most of the days in the same place, then the climate of that place is-
Question 98 :
When are the maximum and minimum temperatures likely to occur during the day?
Question 99 :
State TRUE or FALSE: The temperature can be as low as –37°C in polar regions. Animals living there couldn't get adapted to these severe conditions.
Question 100 :
The sun is the _____ source of energy that causes changes in the weather.
Question 102 :
The safety device based on the heating effect of electric current is called a _____________.
Question 103 :
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 104 : <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 105 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?
Question 106 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd0f59b460d7261eca9.jpg' />
A person takes around 75 cm long piece of insulated (plastic or cloth covered or enamelled) flexible wire and an iron nail, say about 6–10 cm long. He winds the wire tightly around the nail in the form of a coil. Now, he connects the free ends of the wire to the terminals of a cell through a switch as shown in above figure. Next, he places some pins on or near the end of the nail. Now, he switches on the current. He switches off the current. Are the pins still clinging to the end of the nail?
Question 107 :
Are the batteries used in tractors, trucks and inverters also made from cells?
Question 109 :
When an electric current flows through a wire , the wire gets _____ .
Question 110 :
Choose the statement which is correct in the case of an electric fuse.
Question 112 :
When an electric current flows through a wire, it behaves like a magnet. State true or false .
Question 113 :
The combination of two or more cells is called a ____________.
Question 114 :
What property of conducting wires is ideal for making electric fuses?
Question 116 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?
Question 117 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?
Question 118 : <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 121 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?
Question 122 :
A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. State true or false .
Question 123 :
What is correct about a switch when it is in OFF position?
Question 125 :
True or False. The compass needle gets deflected when the current flows in a nearby wire.
Question 126 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb60f59b460d7261ec26.PNG' />
Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the figure above. The current flowing in both the circuits is the same. Will the heat produced in both the cases be equal? Explain.
Question 127 :
Which of the following precautions need not to be taken while using electric gadgets/appliances/ circuit?
Question 128 :
A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. State true or false .
Question 129 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcbf59b460d7261eca2.jpg' />
A person makes the circuit as shown in the above figure. However, he replaces the cell with a battery of four cells. Also, in place of the nichrome wire, he ties a thin strand of steel wool. (The steel wool is commonly used for cleaning utensils and is available in grocery shops.) If there are any fans in the room, he switches them off. Now, he passes the current through the circuit for sometime. Does the strand of steel wool melt and break?
Question 130 : <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 131 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcdf59b460d7261eca4.jpg' />
A person takes the cardboard tray from inside a discarded matchbox. He wraps an electric wire a few times around the cardboard tray. Then, he places a small compass needle inside it. Now, he connects the free ends of this wire to an electric cell through a switch as shown in above figure. He notes the direction in which the compass needle is pointing and brings a bar magnet near the compass needle. He moves the switch to the ‘ON’ position. Move the switch back to the ‘OFF’ position. Does the compass needle come back to its initial position?
Question 132 : <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 133 :
A current carrying wire acts as a _______ with a magnetic field around it.
Question 134 :
Which of the following is the correct symbol of a battery?
Question 135 : <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 136 :
Which device is used as a safety device which prevents damages to electrical circuits and possible fires?
Question 139 :
When current is switched ‘on’ in a room heater, it ___________.
Question 140 :
In an electric circuit a fuse is a ________ to prevent possible fire.
Question 142 :
Choose the statement which is not correct in the case of an electric fuse.
Question 144 :
Choose the statement which is correct in the case of an electric fuse.
Question 145 :
The wire gets hot when an electric current passes through it. What is this effect called as?
Question 146 :
In an electric circuit a fuse is a ________ to prevent possible fire.
Question 147 :
If the filament of the bulb is broken, would the circuit be complete?
