Perception of Sound

Q.

What do you understand by the term quality of sound?

Q.

What is the relation between Loudness and Amplitude. [2 MARKS]

Q.

The voice of women is shrill as compared to men because of the difference in their:

1. speed

2. loudness

3. frequency

4. all these

Q. When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of $12cm$. What is the wavelength of the sound wave?

1. $1cm$
2. $4cm$
3. $3cm$
4. $6cm$

Q.

Differentiate between-

Fundamental and harmonics.

Q.

How can we change the pitch of different musical instruments?

Q. When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of $10cm$. What is the wavelength of the sound wave?

1. $0.4cm$
2. $1.3cm$
3. $3.3cm$
4. $2.5cm$

Q. If a sound has a high amplitude then it also has ____________.

1. fast echos
2. a low pitch
3. a high volume
4. a low volume

Q.

How is the loudness of sound related to:
(iii) density of the medium producing sound

Q.

Decibel is the unit to measure the _______ of sound.

1. Loudnesss

2. Pitch

3. Frequency

4. Quality

Q.

Two notes are produced from a flute and piano, such that they have same loudness and same pitch. The notes so produced differ in their:

1. waveform

2. wavelength

3. frequency

4. speed

Q.

The surface area of a vibrating body directly affects the loudness of a sound.

1. True
2. False

Q.

Two waves have frequencies 256 Hz and 512 Hz, but same amplitude. Compare their

(i) loudness, and

(ii) pitch.

Q.

The characteristic which determines the Energy carried by sound waves is-

1. Loudness

2. Pitch

3. Quality

4. None of these.

Q.

What changes would you expect in the characteristic of musical sound when we increase,

(i) its frequency and (ii) its amplitude?

Q.

Define loudness of a sound wave. Who has a louder voice – a boy or a girl?

Q. The time period, loudness, and amplitude of a sound wave are 4 seconds, 5 dB, and 2 units respectively. Find the loudness and frequency of the sound wave when the amplitude is increased to 10 units and the time period is reduced to half the initial value.

1. Loudness = 625 dB; Frequency = 0.5 Hz
2. Loudness = 25 dB; Frequency = 0.25 Hz
3. Loudness = 5 dB; Frequency = 0.25 Hz
4. Loudness = 125 dB; Frequency = 0.5 Hz

Q.

The loudness of a sound is 8 db when the amplitude of vibrations is 2 units. If the amplitude is increased to 8 units, find the loudness of the sound in db. [3 MARKS]

Q. Loudness is proportional to the square of the amplitude of a sound wave.

1. False
2. True

Q. The diagram shows a graph of the sound wave given out by a tuning fork.
Trace it on a graph paper and draw graphs to show:
1. Louder sound of the same pitch.
2. Sound of the same loudness but greater pitch.
​3. Sound that is louder and also has greater pitch.

Q.

The amplitude of the sound is doubled. Its pitch will

1. Double

2. Become four times

3. Remain same

4. none of these

Q.

Answer in one word-

The intensity of a vibrating source producing sound.

Q.

Name the characteristic of sound in relation to its waveform.

Q.

Write a short note on the quality of sound.

Q. A sound source is producing 2000 waves in 4 seconds. The loudness and amplitude of this sound wave are 10 dB, and 5 units respectively. Find loudness and frequency of the sound wave when the amplitude is increased to 10 units.​

1. Loudness = 40 dB; Frequency = 5 Hz
2. Loudness = 40 dB; Frequency = 5 Hz
3. Loudness = 50 dB; Frequency = 5 Hz
4. Loudness = 40 dB; Frequency = 500 Hz

Q.

Question 3 (c)
State whether the following statement is true or false.
If the amplitude of vibration is large, the sound is feeble.

Q.

By decreasing the amplitude of a pure note, its:

1. speed decreases

2. wavelength decreases

3. quality changes

4. loudness decreases

Q.

Explain the factors on which loudness of sound depends.

Q.

What do you understand by the term loudness of sound?

Q. When the midpoints of four consecutive troughs in a sound wave are joined, it constitutes a distance of $12cm$. What is the wavelength of the sound wave?

1. $3cm$
2. $6cm$
3. $1cm$
4. $4cm$