Sound Test

Result

Sound Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The time period of a pendulum, which is vibrating at 10 hertz is

A
10 s

B
0.1 s

C
0.2 s

D
30 s
Question 2
1 / -0

The product of time period and frequency is

A
zero

B
unity

C
infinity

D
none of these
Question 3
1 / -0

The maximum displacement of a particle in a wave motion is called

A
frequency

B
amplitude

C
time period

D
phase
Question 4
1 / -0

Wavelength is defined as the distance between

A
two consecutive particles in the same phase

B
two consecutive crests

C
two consecutive troughs

D
all of these
Question 5
1 / -0

The time period of Khushi`s voice is 0.002 seconds. The frequency of her voice is

A
5000 Hz

B
500 Hz

C
50 Hz

D
5 Hz
Question 6
1 / -0

Which of the following are not transverse waves?

A
X-rays

B
Visible light waves

C
-rays

D
Sound waves in a gas

Solution

Sound waves in a gas are not transverse waves.
Question 7
1 / -0

What is the ratio of frequencies of waves A and B?

A
1 : 1

B
1 : 2

C
2 : 1

D
4 : 1

Solution

In case of A, the time taken to complete one oscillation is 0.2 sec.
Hence,

In case of B, the time taken to complete one oscillation is 0.4 sec.
Hence,

Hence,
Question 8
1 / -0

Whose voice among the following is likely to have a minimum frequency?

A
A baby girl

B
A baby boy

C
A man

D
A woman
Question 9
1 / -0

Which of the following statements is wrong?

A
Velocity of light in vacuum is 3 x 10⁸ m/s.

B
Sound travels faster in dry air than in the moist air.

C
The audible frequency range for human beings is 20 Hz - 20000 Hz.

D
Sound waves do not propagate in vacuum.
Question 10
1 / -0

The speed of sound in gas at NTP is 300 m/s. If the pressure is increased three times and the temperature remains the same, what will be the velocity of sound?

A
100 m/s

B
300 m/s

C
600 m/s

D
900 m/s
Question 11
1 / -0

A speaker system generates sound waves at a frequency of 2400 Hz. If the speed of wave in air is 325 m/s, what is the wavelength?

A
7.38 m

B
3.69 m

C
0.135 m

D
0.07 m
Question 12
1 / -0

A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m. What is the speed of this sound?

A
196.9 m/s

B
507.8 m/s

C
257.3 m/s

D
332.8 m/s
Question 13
1 / -0

An elephant produces 20 Hz sound wave. What will be its wavelength if sound travels in the air at a speed of 344 ms^-1?

A
34.4 m

B
17.2 m

C
68.8 m

D
6880 m
Question 14
1 / -0

A sound wave travels at a speed of 399 ms^-1. If its wavelength is 2.5 cm, what is the frequency of the wave?

A
159.6 Hz

B
15,960 Hz

C
847.5 Hz

D
8.475 Hz

Solution

Speed of the wave can be written as:

v = λf; where λ is the wavelength and f is the frequency of the sound.
Question 15
1 / -0

Pitch of a voice refers to its

A
quality of sound

B
frequency of sound

C
intensity of sound

D
chord of sound
Question 16
1 / -0

An echo returned in 2 s. If the speed of sound is 342 ms^-1, what is the distance of the reflecting surface from the source?

A
342 m

B
171 m

C
684 m

D
85.5 m
Question 17
1 / -0

Infrasonic waves are the waves having frequency

A
more than 20 Hz

B
less than 20,000 Hz

C
less than 20 Hz

D
none of these
Question 18
1 / -0

Ultrasound is used for

A
medical diagnosis

B
detecting congenital defects in foetus

C
detecting cracks and flaws in metal blocks

D
all of the above
Question 19
1 / -0

Which of the following statements is incorrect?

A
The energy carried by ultrasound is very high.

B
Ultrasound cannot travel along a well defined straight path.

C
Bats can produce ultrasonic sound.

D
Ultrasound is of frequency above 20 kHz.
Question 20
1 / -0

Two sound waves in the air have their wavelengths in the ratio 2 : 5. The ratio of their frequencies is

A
2 : 5

B
5 : 2

C
10 : 1

D
25 : 4