Formation of Shadow

Q.

What is a shadow? Give example. [2 MARKS]

Q.

What is a shadow? Give an example. [2 MARKS]

Q. You have to cast the shadow of your pencil on the wall with the help of a candle in a dark room. How can you obtain the shadow of the same size, small size and big size of the same pencil? [5 MARKS]

Q.

How shadows are formed? Do all objects cast shadows?

Q. A boy shines a torch on a ball and catches its shadow on the screen as shown. If he moves away from the object, what happens to the size of the shadow?

1. Decreases
2. Increases
3. Remains the same
4. Cannot be determined

Q. Which of the following characteristics is not exhibited by the shadow of an object?

1. It can be bigger than the object
2. It can be right side up.
3. It can be of the same colour as the object
4. It can be formed on a screen

Q.

A translucent object casts a ___________ shadow.

Q.

How are shadows formed?

Q. During shadow formation, shadow region is darker than the region lit by the source of light.

1. True

2. False

Q. A boy plays with an opaque cone by moving it closer to and further from a torch (as shown below), and observes the different kinds of shadows it forms. Help him understand the factors that are responsible for the sizes of the shadows.
(More than one option can be correct)

1. The colour of the object
2. The distance between the object and the source of light
3. The angle at which the light rays fall on the object
4. The size of the opaque object

Q. ___ objects cast the darkest shadows.

1. Luminous
2. Opaque
3. Transparent
4. Translucent

Q.

Shadows are formed by ___ object.

Q. Look at the figure given below.

Will there be any difference in the shadow formed on the screen in case A and case B?

Q. If the light source is closer to the object, shadow will be ______.

1. pointed
2. smaller
3. bigger
4. same size

Q. Ram did an experiment with a ball and a torch. At first, he placed the torch exactly perpendicular to the ball (position A) and then he kept the torch in a slightly inclined position to the left (position B). The correct observation about the size of shadows formed in the two positions are :

1. Shadow at position A is greater than the shadow at position B.
2. Shadow at position B is greater than the shadow at position A.
3. The shadow at position A and position B was of the same size of that of the ball .
4. The shadow at position A and position B was of the same size but larger than the size of the ball .

Q.

The size and shape of the shadow depend on:

Q. In the given figure, 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?
Fig. 11.11

Q. Translucent objects form the darkest shadows.

1. True
2. False

Q. What are the factors that affect the size of a shadow?

1. The colour of the object
2. The distance between the object and the source of light
3. The distance between the object and the screen
4. The size of the opaque object

Q.

___is casted on a screen, when an opaque body blocks light.

Q. ___ objects cast the darkest shadows.

1. Luminous
2. Opaque
3. Transparent
4. Translucent

Q. To see shadows with the help of our eyes, a screen is required.

1. True
2. False

Q. In the given figure, 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?
Fig. 11.11

Q. When an object moves closer to a light source, its shadow gets smaller.

1. False
2. True

Q. Objects that form faint shadows are ________ in nature.

1. translucent
2. opaque
3. irregular
4. transparent

Q.

Which of the following statement is true regarding the shape of a shadow?

1. It is always similar to the object.

2. It depends on the orientation of light source and the size of the object.

3. It is always smaller than the object.

4. It is always larger than the object.

Q. Shadows are formed when an opaque object comes in the path of light.

1. True
2. False