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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.
circular lines.
straight 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 reflects to our ears causing hearing.
some of this rays may go through 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............
light cannot pass through the object.
this object is a transparent object.
this reflects light.
light can pass through object.
4
Opaque material............
bounces off some of light that fall on it only.
absorbs some of light that fall on it only.
absorbs some of light that fall on it and bounces off the other.
allows light to pass through.
5
All of the following are transparent objects, except............
glass.
paper.
water.
air.
6
You cannot see through all the following objects, except..........
a glass of water.
painted surface.
polished mirror.
human body.
7
Opaque objects and transparent objects are characterized by...........
both of them allow all falling light to pass through.
both of them reflect all falling light.
both of them absorb all falling light.
transparent objects allow most of light to pass through, while opaque objects don't.
8
Painted surface........... the incoming light rays.
allows to pass
reflects only
absorbs only
absorbs and reflects
9
Polished mirror, causes falling light rays.........
to reflect at different directions they strick the polished mirror.
to diffuse like that of rough surfaces.
to pass through it.
to reflect at the same angle they strick the polished mirror. polished mirror.
10
Our eyes,..............
can see transparent objects, while opaque objects cannot be seen.
cannot see both opaque and transparent objects.
can see both opaque and transparent objects.
can see opaque objects, while transparent 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.
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
don't reflect any 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 cannot see the wood sheet through the glass sheet.
the light can pass through both sheets.
you can see the wood sheet through the glass sheet.
you can see the glass sheet through the wood sheet.
13
It is a transparent matter, that allows light to pass through
Moon
Polished mirror
lenses
Reflected light
14
It is a rough surface, that scatter reflected light rays.
lenses
Piece of cloth
Moon
Polished mirror
15
It is the light, that bounces of a reflecting surface.
Reflected light
Polished mirror
lenses
Moon
16
It is a smooth shiny surface, that reflects most of falling light
Reflected light
lenses
Moon
Polished mirror
17
It doesn't considered as a source of light, that present in the sky
Moon
Reflected light
Polished mirror
lenses
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