8.1 & 8.2 : LIGHT

Which of the following instrument uses a plane mirror?

• camera

• telescope

• periscope

• dental mirror

Size of image is always smaller than the object in

• plane mirror

• convex mirror

• concave mirror

• concrete mirror

What is the function of plane mirrors in a periscope?

• to reflect light

• to refract light

• to disperse light

• to scatter light

Mirror Y at a supermarket can help a shopkeeper to see every corner of the supermarket to prevent theft. What is mirror Y?

• plane mirror

• convex mirror

• concave mirror

• concrete mirror

Why do we see lightning before we hear the thunder in a storm?

• sound travels faster than light

• light travels faster than sound

• we can see faster than we can hear

• sound cannot travel through the air

Materials which do not allow light to pass through them are called

• opoque

• mirror

• transparent

• translucent

When light is blocked by an opaque object, a .............. is formed behind the opaque object.

• image

• object

• shadow

• reflection

Wayang's kulit is performed by using puppet's shadow behind a screen.

Which of the following statement is NOT TRUE regarding wayang kulit?

• light travels in a straight line

• light is not reflected off the puppets

• light is blocked by opaque objects

• light penetrates the puppets and reaches the screen

What is the speed of light?

• 3.0 X 10⁸ ms^-1

• 3.0 X 10⁸ ms^-2

• 3.0 X 10^-8 ms^-1

• 3.0 X 10^-8 ms^-2