Class 7 Science Curiosity Chapter 11 Light: Shadows and Reflections NCERT Solutions Are you searching for the Class 7 Science Curiosity Chapter 11 Light: Shadows and Reflections NCERT Solutions? This chapter explains important concepts such as the formation of shadows, reflection of light, transparent, translucent, and opaque objects, and their real-life applications in a simple and easy-to-understand manner.
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1. Which of the following are luminous objects?
Mars, Moon, Pole Star, Sun, Venus, Mirror
Answer:
Pole Star and Sun.
2. Match the items in Column A with those in Column B.
Answer:
3. Sahil, Rekha, Patrick, and Qasima are trying to observe the candle flame through the pipe as shown in Fig. 11.16. Who can see the flame?
Answer:
Only Rekha can see the candle flame.
Explanation:
Rekha is looking through the pipe that is in a straight line with the candle flame. Light travels in a straight line, so the light from the flame reaches her eyes directly. The other pipes are bent, so Sahil, Patrick, and Qasima cannot see the flame.
4. Look at the images shown in Fig. 11.17 and select the correct image showing the shadow formation of the boy.
Answer:
The shadow of an object always forms in the direction opposite to the Sun. In image (d), the Sun is on the upper-right side of the sky, so the boy’s shadow should form towards the lower-left side. Therefore, image (d) correctly shows the shadow formation of the boy.
5. The shadow of a ball is formed on a wall by placing the ball in front of a fixed torch as shown in Fig. 11.18. In scenario (i) the ball is closer to the torch, while in scenario (ii) the ball is closer to the wall. Choose the most accurate representation of the shadows formed in both scenarios from the options provided (a and b).
Answer:
In scenario (i), the ball is closer to the torch, so the shadow formed on the wall will be larger than the ball.
In scenario (ii), the ball is closer to the wall, so the shadow formed will be smaller.
Therefore:
Scenario (i) → shadow (b)
Scenario (ii) → shadow (a)
6. Based on Fig. 11.18, match the position of the torch in Column A with the characteristics of the ball’s shadow in Column B.
Answer:
7. Suppose you view the tree shown in Fig. 11.19 through a pinhole camera. Sketch the outline of the image of the tree formed in the pinhole camera.
Answer:
A pinhole camera forms an inverted image of the object, so the image of the tree would be upside down.
8. Write your name on a piece of paper and hold it in front of a plane mirror such that the paper is parallel to the mirror. Sketch the image. What difference do you notice? Explain the reason for the difference.
Answer:
When I hold the paper with my name in front of a plane mirror, the image in the mirror appears laterally inverted. The left side of the name appears on the right, and the right side appears on the left.
This happens because a plane mirror reverses the image sideways, which is known as lateral inversion.
9. Measure the length of your shadow at 9 AM, 12 PM, and 4 PM with the help of your friend. Write down your observations:
(i) At which of the given times is your shadow the shortest?
Answer:
The shadow is shortest at 12 PM.
(ii) Why do you think this happens?
Answer:
This happens because at 12 PM, the Sun is almost directly overhead, so the light falls on our body from the top and the shadows become short.
10. On the basis of the following statements, choose the correct option.
Statement A: Image formed by a plane mirror is laterally inverted.
Statement B: Images of alphabets T and O appear identical to themselves in a plane mirror.
(i) Both statements are true
(ii) Both statements are false
(iii) Statement A is true, but statement B is false
(iv) Statement A is false, but statement B is true
Answer:
(i) Both statements are true.
A plane mirror forms laterally inverted images, and the alphabets T and O appear the same in the mirror even after left-right reversal.
11. Suppose you are given a tube of the shape shown in the Fig. 11.20 and two plane mirrors smaller
than the diameter of the tube. Can this tube be used to make a periscope? If yes, mark where you will fix the plane mirrors.
Answer:
Yes, it can be used to make a periscope. The two red marks indicate the positions where the plane mirrors will be fixed inside the tube.
12. We do not see the shadow on the ground of a bird flying high in the sky. However, the shadow is seen on the ground when the bird swoops near the ground. Think and explain why it is so.
Answer:
When a bird is flying high in the sky, it is far away from the ground, so its shadow becomes very large and faint and cannot be seen clearly. But when the bird comes near the ground, the shadow becomes smaller and darker, so we can see it clearly.
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