Sound Test

Result

Sound Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following formulas is correct? (Where symbols have their usual meanings.)

A
L = log₁₀

B
L = 10log₁₀

C
L = 10log₁₀

D
Both (2) and (3)
Question 2
1 / -0

Sound waves are produced by ______________.

A
Linear motion

B
Circular motion

C
Vibrating bodies

D
Transitional motion

Solution

Sound waves are produced by vibrating bodies.
We set the objects vibrating and produce sound. Vibration means a kind of rapid to and fro motion of an object. The sound of the human voice is produced due to vibrations in the vocal cords.
Hence, the correct option is (C).
Question 3
1 / -0

If the loudness is measured as 10 phon and intensity is measured as 100 , find constant of proportionality.

A
90

B
5

C
110

D
10
Question 4
1 / -0

Match the following factors with their characteristics.

A
(i) - (e), (ii) - (b), (iii) - (c), (iv) - (d), (v) - (a)

B
(i) - (b), (ii) - (d), (iii) - (c), (iv) - (e), (v) - (a)

C
(i) - (e), (ii) - (b), (iii) - (a), (iv) - (c), (v) - (d)

D
(i) - (b), (ii) - (c), (iii) - (d), (iv) - (a), (v) - (e)
Question 5
1 / -0

Which of the following is incorrect regarding sound waves?

A
The amplitude of a sound waves determines its loudness or volume.

B
The faster the sound source vibrates, the higher the frequency.

C
The wavelength of sound waves is in the range from 10 m to 10² m.

D
The speed of sound waves in air actually depends on the temperature of air.
Question 6
1 / -0

What is the audible range of sound for humans?

A
0 Hz - 100 Hz

B
20 Hz - 2000Hz

C
20 Hz - 20,000 Hz

D
Above 20, 000 Hz
Question 7
1 / -0

Which of the following is an example of resonant vibrations?

A
A load suspended from a string is stretched, and then released.

B
A tuning fork is vibrating in air and simple pendulum oscillating in air.

C
The two pendulums of the same length are suspended from a rubber string resulting in symphathethic vibrations of pendulums.

D
The vibrations are produced in diaphragm of microphone sound box.
Question 8
1 / -0

Before playing the orchestra in a musical concert, a guitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting:

A
Intensity of sound only

B
Amplitude of sound only

C
Frequency of the guitar string with the frequency of other musical instruments

D
Loudness of sound

Solution

Before playing the orchestra in a musical concert, a guitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting the frequency of the guitar string with the frequency of other musical instruments.
Every musical note created from any musical instrument works on a specific frequency. And to properly play that instrument, we have to adjust these frequencies accurately.
Hence, the correct option is (C).
Question 9
1 / -0

When can the echo NOT be heard?

A
When the distance is less than 17 m.

B
When original sound mixes up with reflected sound.

C
When there are repeated reflections at reflecting surface.

D
All of these
Question 10
1 / -0

Shyam heard the thunder after 7 seconds when he saw the lightening. How far is he form the lightening, if velocity of the sound is 343 m/s?

A
1.4 km

B
3.6 km

C
2.4 km

D
6.8 km
Question 11
1 / -0

In which of the following vibrations, the energy lost by vibrating body gradually converts into heat energy, and gets dissipated in surrounding system?

A
Free vibrations

B
Forced vibrations

C
Damped vibrations

D
Resonant vibrations
Question 12
1 / -0

The length of a simple pendulum is 39.2 m. Find its frequency.

A
9.8 10^-5 Hz

B
3 10^-4 Hz

C
8 10^-2 Hz

D
6 Hz
Question 13
1 / -0

Which of the following does not depend upon amplitude of wave?

A
Damped vibrations

B
Resonant vibrations

C
Echo

D
Loudness of sound
Question 14
1 / -0

On which of the following factors does loudness of sound NOT depend?

A
Distance travelled

B
Surface area of vibrating body

C
Type of wave form

D
Density of medium
Question 15
1 / -0

The minimum distance between the particles in a medium vibrating with the sane phase of a wave is ____________.

A
amplitude

B
frequency

C
wavelength

D
phase
Question 16
1 / -0

Rita hears an echo of her own voice while standing at the peak of a mountain after 12 seconds. The speed of sound in air is 340 m/sec. How far did her voice travel?

A
28.33 m

B
629 m

C
2040 m

D
3120 m
Question 17
1 / -0

The loudness of sound varies directly with the vibrating body’s _________.

A
intensity

B
amplitude

C
pitch

D
quality

Solution

The loudness of sound varies directly with the vibrating body’s amplitude.
The loudness or softness of a sound is determined basically by its amplitude. The amplitude of the sound wave depends upon the force with which an object is made to vibrate. If we strike a table lightly, we hear a soft sound because we produce a sound wave of less energy (amplitude).
Hence, the correct option is (B).
Question 18
1 / -0

Which of the following statements defines damped vibrations?

A
These are periodic vibrations of a body of constant amplitude in absence of external force on it.

B
The frictional forces do not act at all.

C
When frequency of an applied force becomes equal to natural frequency.

D
These are periodic vibrations of a body of decreasing amplitude in presence of resistance force.
Question 19
1 / -0

Which of the following characteristics refers to the shrillness of sound?

A
Pitch

B
Quality

C
Loudness

D
Intensity
Question 20
1 / -0

What is the percentage change in intensity of sound when the change in level of loudness is 1 dB?

A
0%

B
56%

C
26%

D
100%