The thing which give off light are called light source.

• True

• False

Which of these object is natural light source?

• moon

• flashlight

• Sun

• campfire

What is the correct order of what happens when our eyes see the flower in the picture:

1. the light bounces off

2. the light enters the boy's eyes

3. the sunlight hits the flowers

• 1-2-3

• 2-1-3

• 3-1-2

• None of these

This graph shows how the light intensity changes as the distance from the light source increases.

What is the light intensity at 30 cm from the light source?

• 2000 lux

• 4500 lux

• 1500 lux

• 550 lux

For a shadow to form, there must be a ....

• light circuit

• light intensity

• light source

• bright light

If your shadow is in front of you, the sun is ... you.

• beside

• behind

• in front of

• between

Look at the picture! When the ball is further from the light source, the shadows is ....

• smaller

• bigger

• longer

• shorter

It is early morning and the sun has just risen. Which picture shows the correct shadow?

• 
• 
• 
• 

The center of our solar system is sun.

• True

• False

The earth spins on its ....

• axis

• curve

• east

• west