Sound Test

Result

Sound Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A sound wave reflected at the boundary will undergo a phase change on reflection at

A
all reflections

B
air water boundary

C
metal-air boundary

D
None of these

Solution

A sound wave, reflected at the boundary, will undergo a phase change on reflection at denser boundary. In the metals, speed of the sound is more as compared to the speed of sound in air, so air will act as a denser medium. Sound waves in a solid experience a phase reversal when they reflect from a metal-air boundary.
Question 2
1 / -0

When sound travels through air, the temperature

A
remains constant

B
rises during compression & falls at refraction

C
rises both during compression & refraction

D
None of these
Question 3
1 / -0

The velocity of sound in an ideal gas is dependent on change in

A
pressure

B
density

C
temperatur

D
frequency

Solution

The velocity of sound in an ideal gas is dependent on change in temperature. It has very weak dependence on pressure, density and frequency.
Question 4
1 / -0

A transverse wave travels along the z-axis. The particles of the medium must move

A
along the z-axis

B
along the x-axis

C
along the y-axis

D
along the x-y plane
Question 5
1 / -0

Velocity of sound in a gas varies with pressure (p) as

A
P^{1/ 2}

B
P²

C
P^{3/ 2}

D
P⁰

Solution

At constant temperature, gas pressure has no effect on speed of sound, because pressure and density have equal but opposite effects on speed of sound, and the two ontributions cancel out exactly.
Question 6
1 / -0

A man hears the sound of lightning after 6 seconds. The distance of the cloud from the man is

A
3.98 km

B
2.98 km

C
1.98 km

D
None of these

Solution

Distance = Speed × Time
Speed of sound in air = 331.5 m/s
So, distance = 1989 m = 1.98 km
Question 7
1 / -0

Speed of sound in air is 332 m/s at STP. The speed of sound in hydrogen at STP will be

A
5312 m/s

B
2546 m/s

C
1260 m/s

D
None of these
Question 8
1 / -0

At what temperature will the velocity of sound in air be 3 times of its value at 0⁰ C?

A
2184⁰ C

B
100⁰C

C
96⁰C

D
104⁰C
Question 9
1 / -0

Velocity of sound in a gas does not depend upon

A
humidity

B
temperature

C
pressure

D
None of these
Question 10
1 / -0

The equation y = a cos² (2 π nt - 2 π x /λ) represents a wave with

A
amplitude a, frequency n & wavelength λ

B
amplitude a, frequency 2n & wavelength 2λ

C
amplitude a, frequency n & wavelength 3λ

D
amplitude a / 2, frequency 2n & wavelength λ/2
Question 11
1 / -0

A wave is represented by x = 0.4 cos (8 t - y /2) where x & y in meters & t in sec. The speed of the wave is

A
0.5 m/s

B
8 m/s

C
16 m/s

D
6.1 m/s
Question 12
1 / -0

A wave is represented by the equation y = 0.5 sin (10 t + x) meter. It is a traveling wave propagating along + x direction with velocity

A
10 m /s

B
20 m /s

C
5 m /s

D
None of these
Question 13
1 / -0

Decibel is the unit of

A
intensity

B
x - rays radiation capacity

C
sound loudness

D
energy of radiation

Solution

Decibel is the unit of sound loudness.
Decibel (dB) is used to measure sound levels. It is also widely used in electronics,communication and signals.
A decibel is the unit to express the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds.

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Question Analysis

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Re-Attempt Weekly Quiz Competition

Sound Test - 2

Result

Sound Test - 2

Score

-

Rank

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SHARING IS CARING

Question 1

all reflections

air water boundary

metal-air boundary

None of these

Solution

Question 2

remains constant

rises during compression & falls at refraction

rises both during compression & refraction

None of these

Question 3

pressure

density

temperatur

frequency

Solution

Question 4

along the z-axis

along the x-axis

along the y-axis

along the x-y plane

Question 5

P1/ 2

P2

P3/ 2

P0

Solution

Question 6

3.98 km

2.98 km

1.98 km

None of these

Solution

Question 7

5312 m/s

2546 m/s

1260 m/s

None of these

Question 8

21840 C

1000 C

960 C

1040 C

Question 9

humidity

temperature

pressure

None of these

Question 10

amplitude a, frequency n & wavelength λ

amplitude a, frequency 2n & wavelength 2λ

amplitude a, frequency n & wavelength 3λ

amplitude a / 2, frequency 2n & wavelength λ/2

Question 11

0.5 m/s

8 m/s

16 m/s

6.1 m/s

Question 12

10 m /s

20 m /s

5 m /s

None of these

Question 13

intensity

x - rays radiation capacity

sound loudness

energy of radiation

Solution

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Question Analysis

P^{1/ 2}

P²

P^{3/ 2}

P⁰

2184⁰ C

100⁰C

96⁰C

104⁰C