CLASS 3 [ 01/02/21]

Light always travels in a ___________ line.

• Zig-Zag

• straight

• curved

• None of these

Sound is a form of ___________.

• light

• energy

• None of the above

Which of these is a man-made source of light?

• The sun

• Star

• The moon

• Bulb

Which of these is a pleasant sound?

• Barking of dogs

• Horn of vehicles

• Screaming of children

• Chirping of birds

You apply force to______.

• produce sound

• produce light

• do work

• do nothing

The main source of light on the earth is______.

• the moon

• candle

• the sun

• tube light

Objects which emit light of their own

• Lightning

• Non Luminous objects

• Luminous objects

• None of these

It is formed when light coming from a source is blocked.

A force that slows down or stops a moving object

• Light

• Sound

• Friction

• None of these

Natural non-luminous object

• Sun

• Star

• Candle

• Moon