Shadows

Q. Which objects do not cast a shadow?

1. Transparent objects
2. Opaque objects
3. Wooden objects
4. Translucent objects

Q. Shadow is shortest during the sunset.

1. True
2. False

Q.

Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Q. Which of the following things are necessary for the formation of shadows?

1. Light source
2. Heat
3. Screen or wall
4. Opaque or translucent object

Q. What kind of objects form darkest shadows?

1. Glass objects
2. Translucent objects
3. Opaque objects
4. Transparent objects

Q.

When the extended source of light is bigger than the opaque body the penumbra region is

1. equal to the size of umbra region

2. smaller than the size of umbra region

3. bigger than the size of umbra region

4. none of the above

Q.

We can see clearly through both transparent and translucent objects.

1. True
2. False

Q. If the light source is moved away from the object, then

1. size of shadow decreases
2. size of shadow increases
3. shadow disappears
4. size of shadow remains same

Q.

The portion of shadow that receives no light is the __________ and the portion that receives light from a part of the source is the ____________.

Q.

Which of the following can never form a circular shadow?

1. A ball

2. A flat disc

3. A shoe box

4. An ice cream cone

Q.

Light cannot pass through ________ (translucent/ opaque) objects.

Q.

Give one word.

The completely dark region in a shadow is called.

Q.

Think and Answer:

In a day and night cricket match, you might have observed that the players have many shadows. Can you explain why this is so?

Q.

Which of the following body allows only a part of the light to pass through it?

1. Oiled paper

2. Brick

3. Wood

4. air

Q.

When we have an opaque object in front of a finite source, we get both an _______and ___________.

Q.

Which of the following will stop all light from passing through it?

1. shoe
2. pencil
3. cardboard
4. piece of thin cloth.

1. A, B and C

2. B, C and D

3. A, C and D

4. A, B and D

Q.

A body which allows almost all the light to pass through it and does not reflect any light is a

1. transparent body

2. opaque body

3. translucent body

4. polished surface

Q.

Objects that allow light to pass through them completely.

Q.

The materials which do not allow light to pass through them completely.

Q.

A body which allows almost all the light to pass through it and does not reflect any light is a that

1. Transparent body

2. Opaque body

3. Translucent body

4. Polished surface