The correct statement is:

1. Sound and light both require medium for propagation
2. Sound can travel in vacuum, but light cannot
3. Sound needs medium, but light does not need medium for it's propagation
4. Sound and light both can travel in vacuum

Sound in air propagates in form of:

1. Longitudinal wave
2. Transverse wave
3. Both longitudinal and transverse wave
4. Neither longitudinal nor transverse wave

The position of maximum upward displacement of medium particles in a transverse wave is known as :

1. trough
2. compression
3. rarefaction
4. crest

The wave in which the particles of a medium vibrate about their mean position in a direction …………… to the direction of propagation of the wave is called transverse wave.

1. parallel
2. similar
3. perpendicular
4. none of the above