Light, Shadow and reflection

Which of the following objects do not cast shadows?

• Translucent objects

• Transparent objects

• Opaque objects

--------------objects do not allow light to pass through it

• Translucent

• Opaque

Which of the following emits light?

• A glow worm

• A rat

• A book

Why does an opaque object form a shadow when placed in the path of light?

• Because opaque object act as a source of light

• Because opaque object does not allow light to pass through it

• Because light gets reflected

Which of the following allows light to pass through it easily?

• A metal plate

• A glass tumbler

• A wooden block

In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

• Yes

• No

Moon is ------------- body

• Luminous

• Non-luminous

• None of the above

A torch is shown to a star shaped card which forms a shadow on the screen behind the card. What will happen to the shadow if the torch is moved away from the card?

• It decreases in size

• It increases in size

A light source is incident on an object P. If a dark coloured shadow of an object is cast on the screen. Which of the following could 'P' be?

• An iron ball

• A piece of glass

• A wax coated paper

You cannot see the flame of a burning candle by looking through a bent pipe. This is because -----------------------

• Light gets bent along the pipe

• Light travels in a straight line

• Light gets absorbed