NCERT Solutions for Class 8 गणित Chapter 13 Sound

• gases only

• solids only

• liquids only

• solids, liquids and gases

Voice of which of the following is likely to have minimum frequency:

• Baby girl

• Baby boy

• A man

• A woman

State True or false:

Sound cannot travel in vacuum.

In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false :

A.

State True or False:

If the amplitude of vibration is large, sound is feeble.

For human ears, the audible range is 20 Hz to 20,000 Hz.

State True or False:

The lower the frequency of vibration, the higher is the pitch.

State True or False: 

Unwanted or unpleasant sound is termed as music.

State True or False:

Noise pollution may cause partial hearing impairment.

Time taken by an object to complete one oscillation is called __________.