Wavelength is measured in:

1. kg
2. second
3. litre
4. metre

The speed of sound in water is:

1. 332 m s^-1
2. 1500 m s^-1
3. 5000 m s^-1
4. 1000 m s^-1

Sound persists in human ear for about :

1. 1 min
2. 30 sec
3. 25 sec
4. 0.1 sec

…………… is called the voice box of humans.

1. throat
2. nose
3. mouth
4. larynx