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Light and Sight - lesson 4
Light and Sight - lesson 4
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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 may go through the object.
some of this rays reflects to our ears causing hearing.
some of this rays is bounced off the object.
some of this rays is absorbed by the object.
3
When light hits an object, a shadow of this object is formed because............
this reflects light.
light can pass through object.
this object is a transparent object.
light cannot pass through the object.
4
Opaque material............
absorbs some of light that fall on it and bounces off the other.
bounces off some of light that fall on it only.
allows light to pass through.
absorbs some of light that fall on it only.
5
All of the following are transparent objects, except............
water.
paper.
glass.
air.
6
You cannot see through all the following objects, except..........
human body.
painted surface.
a glass of water.
polished mirror.
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 reflect all falling light.
both of them allow all falling light to pass through.
8
Painted surface........... the incoming light rays.
reflects only
allows to pass
absorbs and reflects
absorbs only
9
Polished mirror, causes falling light rays.........
to reflect at different directions they strick the polished mirror.
to pass through it.
to diffuse like that of rough surfaces.
to reflect at the same angle they strick the polished mirror. polished mirror.
10
Our eyes,..............
can see opaque objects, while transparent objects cannot be seen.
can see transparent objects, while opaque objects cannot be seen.
cannot see both opaque and transparent objects.
can see both opaque and transparent objects.
11
If the passed light rays from a transparent objects is fallen on an opaque object then the opaque object........ through the transparent object.
reflects some light rays, so we can see it
don't reflect any light rays, so we cannot see it
absorbs all light rays, so we can see it
reflects some light rays, so we cannot 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 glass sheet through the wood sheet.
you cannot see the wood sheet through the glass sheet.
you can 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
Moon
Reflected light
Polished mirror
lenses
14
It is a rough surface, that scatter reflected light rays.
Moon
Polished mirror
Piece of cloth
lenses
15
It is the light, that bounces of a reflecting surface.
Polished mirror
Reflected light
lenses
Moon
16
It is a smooth shiny surface, that reflects most of falling light
Moon
Polished mirror
Reflected light
lenses
17
It doesn't considered as a source of light, that present in the sky
lenses
Reflected light
Moon
Polished mirror
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