Volume

Q.

The loudness of sound depends upon _______.

1. Frequency

2. Amplitude

3. Wavelength

4. Time period

Q. How is loudness of the sound is related to the intensity of wave producing it?

1. L = k log I
2. None of these
3. L = k log I²
4. L = k log 1/I

Q.

One decibel change in loudness is equal to:

1. 36 % change in loudness of sound

2. 26 % change in intensity of sound

3. 26 % change in loudness of sound

4. 36 % change in intensity of sound

Q. The time period of sound is increased by 4 times. Find the ratio of the new speed to the old speed.

1. 1
2. 2
3. 4
4. 8

Q.

What is the intensity of sound wave?

1. Amount of energy per unit area per unit time

2. Amount of energy per unit area

3. Amount of energy per unit time

4. Amount of force per unit time

Q. Decibel (dB) is a unit of loudness of sound. It is defined in a manner such that when the amplitude of the sound is multiplied by a factor of $\sqrt{10}$, the decibel level increases by 10 units. Loud music of 70dB is being played at a function. To reduce the loudness to a level of 30dB, the amplitude of the instrument playing music has to be reduced by a factor of:

1. 10
2. $10\sqrt{10}$
3. 100
4. $100\sqrt{100}$

Q. Which of the following time periods of a sound wave would result in the highest pitch?

1. $0.02\text{s}$
2. $0.2\text{s}$
3. $0.1\text{s}$
4. $1\text{s}$

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

1. Sound will be louder but pitch will not be different.
2. Sound will be louder and pitch will also be higher.
3. Both loudness and pitch will remain unaffected.
4. Sound will be louder but pitch will be lower.

Q. A loud sound can travel longer distance as it has more energy.

1. True
2. False

Q.

If the intensities of two sounds are in ratio 9:4, what is the ratio of their amplitudes?

1. 3:2

2. 81:16

3. 2:3

4. 16:81