A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:

A. water B. wax

C. vacuum D. empty vessel

Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

A. stretched strings

B. stretched membranes

C. metal plates

D. air columns

If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then l for this wave in cm will be:

A. 2 B. 0.2

C. 20 D. 200

Which one of the following does not consist of transverse waves?

A. light emitted by a CFL

B. TV signals from a satellite

C. ripples on the surface of a pond

D. nusical notes of an orchestra

Sound travels in air :

A. if particles of medium travel from one place to another

B. if there is no moisture in the atmosphere

C. if disturbance moves

D. if both, particles as well as disturbance move from one place to another