Light and Sight - lesson 4

1

The light waves travel in the air as...........

zigzag lines.

straight lines.

circular lines.

curved lines.

2

When light rays hit an object, all the following sentences are correct, except...........

some of this rays is bounced off the object.

some of this rays is absorbed by the object.

some of this rays reflects to our ears causing hearing.

some of this rays may go through the object.

3

When light hits an object, a shadow of this object is formed because............

this reflects light.

light cannot pass through the object.

this object is a transparent object.

light can pass through object.

4

Opaque material............

allows light to pass through.

bounces off some of light that fall on it only.

absorbs some of light that fall on it and bounces off the other.

absorbs some of light that fall on it only.

5

All of the following are transparent objects, except............

paper.

air.

glass.

water.

6

You cannot see through all the following objects, except..........

polished mirror.

a glass of water.

painted surface.

human body.

7

Opaque objects and transparent objects are characterized by...........

transparent objects allow most of light to pass through, while opaque objects don't.

both of them absorb all falling light.

both of them allow all falling light to pass through.

both of them reflect all falling light.

8

Painted surface........... the incoming light rays.

absorbs only

allows to pass

absorbs and reflects

reflects only

9

Polished mirror, causes falling light rays.........

to pass through it.

to reflect at different directions they strick the polished mirror.

to diffuse like that of rough surfaces.

to reflect at the same angle they strick the polished mirror. polished mirror.

10

Our eyes,..............

cannot see both opaque and transparent objects.

can see opaque objects, while transparent objects cannot be seen.

can see both opaque and transparent objects.

can see transparent objects, while opaque objects cannot be seen.

11

If the passed light rays from a transparent objects is fallen on an opaque object then the opaque object........ through the transparent object.

don't reflect any light rays, so we cannot see it

reflects some light rays, so we cannot see it

reflects some light rays, so we can see it

absorbs all light rays, so we can see it

12

If there are two sheets, one made of wood in front of the second that made of glass,..........

you can see the wood sheet through the glass sheet.

you can see the glass sheet through the wood sheet.

you cannot see the wood sheet through the glass sheet.

the light can pass through both sheets.

13

It is a transparent matter, that allows light to pass through

Polished mirror

Reflected light

Moon

lenses

14

It is a rough surface, that scatter reflected light rays.

Moon

lenses

Polished mirror

Piece of cloth

15

It is the light, that bounces of a reflecting surface.

Moon

Polished mirror

Reflected light

lenses

16

It is a smooth shiny surface, that reflects most of falling light

Moon

Reflected light

Polished mirror

lenses

17

It doesn't considered as a source of light, that present in the sky

Reflected light

lenses

Polished mirror

Moon