Volume

Q.

Which wave property determines : (a) loudness (b) pitch

Q.

What is sound Intensity?

Q.

What are the two main properties of sound?

Q.

Loudness and softness of sound depends on

1. Speed of the wave

2. Amplitude of the wave

3. time period

4. wavelength of the wave

Q.

Loudness distinguishes a feeble sound from a loud sound of the same frequency.

1. True
2. False

Q.

Consider the following sound waves marked A, B, C and D :

(a) Which two waves represent sounds of the same loudness but different pitch?

(b) Which two waves represent sounds of the same frequency but different loudness?

(c) State whether all these sound waves have been produced by the same vibrating body or different vibrating bodies?

(d) Which vibrating body/ bodies could have generated the sound waves shown here?

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

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

Q.

How many times more intense is a $60dB$ sound than a $30dB$ sound?

1. $1000$

2. $2$

3. $100$

4. $4$

Q.

(a) What is meant by the loudness of sound ? On what factor does the loudness of a sound depend ?

(b) Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.

Q.

The loudness of sound produced by tuning fork can be Increased by increasing?

1. Wavelength

2. Pitch

3. Amplitude

4. Frequency

Q.

The loudness of sound is determined by its _____________

1. Amplitude

2. Frequency

3. Velocity

4. Source

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

Q.

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.

Q.

What is an echo? Where does echo generally occurs?

Q.

Name the unit used to measure the loudness of sound. Also, write its symbol.

Q.

What are the factors on which the timbre of a musical note depends?

Q.

State the factors on which the loudness of a sound depends.

Q.

Name the factors on which loudness of a sound depends.

Q.

Sate the safe limit of sound level in terms of decibel for human hearing.

Q.

Unwanted sound which disturbs and causes harm to humans called noise.

1. True
2. False

Q.

The practical application based on the reflection of sound

1. (a). Megaphone

2. (b). Sounding board

3. (c). Sonometer

4. (d). Both (a) and (b)

Q.

Describe any two applications of reflection of sound.

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

1. True
2. False

Q.

Two sounds having the same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What is the difference between the two sounds the person hears?

1. Second sound is heard with higher pitch

2. First sound is heard with higher pitch

3. First sound is heard with better quality

4. First sound is louder

Q.

Speed of sound is maximum in-

1. Solids

2. Liquid

3. Both solid and liquid

4. None of these.

Q. is the maximum displacement of particles from the mean or equilibrium position.

1. Wavelength
2. Frequency
3. Amplitude

Q. A tuning fork has two prongs because:

1. A balanced motion is possible
2. Energy of the oscillation can be transferred effectively
3. Two prongs ensures strong interference
4. Two prongs ensures greater sound