Choose the correct alternative.

1. Why are shadows formed?

Because light can be reflected.
Because light can be refracted.
Because only some objects produce light.
Because light only travels directly.
Because light can transform into darkness.

2. Why are reflections formed?

Because light can slow down.
Because light bounces back from surfaces.
Because light refracts.
Because travels quickly.
Because light can bend.

3. When does light refract?

When it reflects.
When it bounces back from a surface.
When it travels from one material to another.
When it is bent.
When it is turned off.

4. What happens when you look at the mirror?

light slows down
light reflects
light refracts
light is split into colors
light speeds up

5. What happens when you look through a drinking glass filled with water?

light slows down
light reflects
light refracts
light is split into colors
light speeds up

6. Which of the following is a source of light?

a gold bar
a mirror
a white stone
a star
a silver medal

7. Which of the following is not a light source?

a campfire
the Moon
the Sun
a light bulb
a bolt of lightning

8. What is the function of a glow stick based on?

electricity
heat
refraction
a chemical reaction
organs