NCERT Exemplar Class 6 Science Chapter 11 Light, Shadows and Reflections are part of NCERT Exemplar Class 6 Science. Here we have given NCERT Exemplar Class 6 Science Solutions Chapter 11 Light, Shadows and Reflections.

## NCERT Exemplar Class 6 Science Solutions Chapter 11 Light, Shadows and Reflections

Multiple Choice Questions

Question 1.
Observe the picture given in figure carefully.

A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?
(b) A glass sheet
(c) A mirror
(d) A sheet of white paper,
Solution:
Only a mirror can reflect a patch of light and change its direction.

Question 2.
A student observes a tree given in figure through a pinhole camera. Which of the diagrams given in figures (a) to (d), depicts the image seen by her correctly?

Solution:
(b:) She will observe upside down image of the tree with lateral inversion.

Question 3.
Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in figure.

Who will be able to see the candle flame clearly?
(a) A
(b) B
(c) C
(d) D
Solution:
(d): Light travels in a straight line.

Question 4.
Which of the following is/are not always necessary to observe a shadow?
(a) Sun
(b) Screen
(c) Source of light
(d) Opaque object
Solution:
(a): Sun is a source of light. Any source of light can replace it. So, sun is not always necessary to observe a shadow.

Question 5.
Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observation about the shape and size of the shadow?
(a) The shape of the shadow of the tree changes but the size remains the same.
(b) The size of the shadow of the tree changes but the shape remains the same.
(c) Both the size and shape of the shadow of the tree change.
(d) Neither the shape nor the size of the shadow changes.
Solution:
(c): Sun is source of light here and it changes its position at different points of time. So accordingly size and shape of the shadow of the tree change.

Question 6.
Which of the following can never form a circular shadow?
(a) A ball
(b) A flat disc
(c) A shoe box
(d) An ice cream cone
Solution:
(c)

Question 7.
Two students while sitting across a table looked down on to its top surface. They noticed that they could see their own and each other’s image. The table top is likely to be made of
(a) unpolished wood
(b) red stone
(c) glass sheet
(d) wood top covered with cloth
Solution:
(c): Out of the given options, only glass sheet can reflect light properly in order to form their images.

Question 8.
You have 3 opaque strips with very small holes of different shapes as shown in figure. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?

Solution:
Same image will be formed by these holes. These opaque strips will act as pinholes and image of the sun will be obtained on wall.

Question 9.
Observe the picture given in figure. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet?

Solution:
Sheet P must be of transparent material as it allows light to pass through it.

Question 10.
Three torches A, B and C shown in figure are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.

Solution:
The light from torch C will not form a shadow of the ball on the screen. Torch C is parallel to the screen and light travels in straight line.

Question 11.
Look at the given figure.

Will there be any difference in the shadow formed on the screen in A and B ?
Solution:
No, shadows formed on the screens A and B will be same.

Question 12.
Correct the following statements.
(i) The colour of the shadow of an object depends on its colour of the object.
(ii) Transparent objects allow light to pass through them partially.
Solution:
(i) The colour of the shadow of an object does not depend on its colour of the object.
(ii) Translucent objects allow light to pass through them partially or transparent objects allow most of the light to pass through them.

Question 13.
Suggest a situation where we obtain more than one shadow of an object at a time.
Solution:
At a time we can obtain more than one shadow of an object if light from more than one source falls on it.
For example: While watching a match in a stadium, we can observe multiple shadows of players.

Question 14.
0n a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?
Solution:
Even on a sunny day, a bird or an aeroplane flying high in the sky does not cast its shadow on the ground.
We can see their shadow on the ground only if they are flying very close to the ground. In this case, ground acts as screen.

Question 15.
You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.
Solution:
(i) By applying oil, grease, butter on it or pasting a butter paper on it.
(ii) Grinding (rubbing) the surface of the glass by any abrasive material.

Question 16.
A torch is placed at two different positions A and B, one by one, as shown in figure.

The shape of the shadow obtained in two positions is shown in figure.

Match the position of the torch and shape of the shadow of the ball.
Solution:
A  → a; B → b
As the position of torch changes, we can observe the change in shape of shadow.

Question 17.
A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.
Solution:
Maim The colour of light will not affect the shadow because shadow is the dark patch r formed when an object obstructs the path of
light and hence no light reaches in the shadow region.

Question 18.
Is air around us always transparent? Discuss.
Solution:
Mann Air around us is transparent but when thick smoke/ thick clouds, etc. are present in ‘ the air it does not remain transparent.

Question 19.
Three identical towels of red, blue and green colour are hanging on a clothesline in the sun. ‘ What would be the colour of shadows of these
towels?
Solution:
The colour of shadows of all the three t towels will be same as no light passes through them. Shadow will be of black colour.

Question 20.
Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?
Solution:
The colours of the image of the shirts 1 will be the same as the colour of the shirt. Image obtained using a pinhole camera is inverted.

Question 21.
In figure, a flower made of thick coloured paper has been pasted on the transparent glass sheet.What will be the shape and colour of shadow seen on the screen?

Solution:
The shadow formed will be dark and of the shape of the flower along with the stalk.

Question 22.
A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.
Solution:
We can see the shadow of football lying on the ground because the ground acts as a screen for it. However, when the football is kicked high, the ground, which is acting as a screen is away from the football, hence no shadow of the football will be formed on the ground.

Question 23.
A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
Solution:
Some of the reason can be
(i) The screen is far away from the ball.
(ii) The beam of light from the torch is falling parallel to the screen on the ball.
(iii) The torch is kept away from the ball.

Question 24.
A sheet of plywood, a piece of muslin cloth and that of a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in figure. Will the shadow be formed in each case. If yes, how will the shadow on the screen be different in each case? Give reasons for your answer.

Solution:
Shadow will not be formed in each case. Only the piece of muslin cloth and the sheet of plywood will cast shadow on the screen.
The sheet of plywood will form a dark shadow as it blocks the path of light completely. The piece of muslin cloth will form a lighter shadow as it allows light to pass through it partially. The transparent glass will allow most of the light to pass through it. So, no shadow will be obtained on screen.

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