Light and Optics Quiz - grade 7 O

Which of the following materials lets light through but you cannot see through it?

• a) Transparent

• b) Translucent

• c) Opaque

• d) Reflective

Which of the following materials is described as transparent?

• a) Frosted glass

• b) Clear glass

• c) Bricks

• d) Metal

What happens when light bounces off an object?

• a) It is absorbed

• b) It is transmitted

• c) It is reflected

• d) It is emitted

Light intensity is measured in units called:

• a) Watts

• b) Lumens

• c) Lux

• d) Joules

Objects that don't give out light are called:

• a) Luminous

• b) Opaque

• c) Translucent

• d) Non-luminous

What is the light level at midday approximately?

• a) 200 lux

• b) 20,000 lux

• c) 80 lux

• d) 1 lux

What cells in the retina are sensitive to dim light?

• a) Rods

• b) Cones

• c) Cornea

• d) Lens

How is the image formed on the retina?

• a) By the rods

• b) By the cones

• c) By the cornea

• d) By the lens

Which type of shirt reflects most of the light shining on it?

• a) White

• b) Black

• c) Red

• d) Blue

What part of the eye focuses light onto the retina?

• a) Pupil

• b) Cornea

• c) Lens

• d) Optic nerve