Grade 7 Light

Which of the following is an example of natural source of light?

• LED Bulb

• Sun

• Mobile flash light

• Television Screen

Which of the following is an artificial source of light?

• Firefly

• Stars

• Lightning happening in the sky

• Fireworks

Which of the following is an example of a translucent object?

• Wood

• Cardboard

• Plastic Container

• Magnifying Glass

If the screen is moved away from the light source, what happens to the size of the umbra?

• Size of umbra increases

• Size of umbra decreases

• Size of umbra remains the same

• None of these

On the basis of the arrangement of the Sun, Moon and the Earth, how many types of eclipse are possible?

• 3

• 1

• 4

• 2

Non-luminous objects are those which can produce or emit their own light.

• True

• False

Light continues to travel in a straight line or path until and unless something gets in its way

• True

• False

There are two parts of a shadow.

• True

• False

Shadows are the darkest one light is the brightest.

• True

• False

An eclipse is only a partial hiding of one celestial body by the shadow of another.

• True

• False