State whether the following statement is true or false:

Sound produced by a vibrating body travels to our ears by the actual movement of air.

Define (a) pitch (b) quality (c) loudness of sound.

How is pitch of sound related to its frequency?

In which medium sound travels faster: air or iron?

Is the speed of sound more in water or in steel?

‘Note’ os a sound:

A. of a mixture of several frequencies

B. of mixture of only two frequencies

C. of a single frequency

D. always unpleasant to listen to

A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:

A. sound will be louder but pitch will not be different

B. sound will be louder and the pitch will also be higher

C. sound will be luder but pitch will be lower

D. both loudness and pitch will remain unaffected

When we change a feeble sound to a loud sound, we increase its:

A. frequency B. amplitude

C. velocity D. wave length