Waves Test

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Waves Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

As a wave propagates; which of the following is not satisfied?

A
the wave intensity remains constant for a plane wave

B
total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times

C
the wave intensity decreases as the inverse of the square of the distance from the source for a spherical wave

D
the wave intensity decreases as the inverse of the distance from the source for a spherical wave
Question 2
1 / -0

The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency.

A
10Hz

B
216Hz

C
60Hz

D
360Hz

Solution

Frequency of revolution of disc = 360 rpm = 360 / 60rps = 60rps
Frequency of emitted sound = 6 × No.of holes
= 6 ×60 = 360Hz.
Question 3
1 / -0

The speed of transverse waves in a string depends on:

A
Pressure on the string

B
tension in it and its linear mass density

C
Shear modulus and linear mass density

D
Young’s modulus and linear mass density

Solution

For a string v = √(T/μ)
Question 4
1 / -0

Speed of the sound in a perfectly rigid rod would be

A
Oscillating

B
Damp

C
Infinite

D
Dubbed

Solution

Since particles in a rigid body do not move and hence, no time is delayed in travelling of sound waves.
Question 5
1 / -0

Which instrument work on the basis of reflection of sound waves?

A
Telescope

B
Stethoscope

C
Microscope

D
Horoscope

Solution

Stethoscope works on the basis of reflection of sound waves.
Question 6
1 / -0

Speed of a progressive wave,v is given by

A
ωk

B
λT

C
λf

D
ωT

Solution

f = v/λ
v = λf
Question 7
1 / -0

What causes the rolling sound of thunder?

A
Reflection of waves

B
Air currents

C
Air currents

D
Refraction of waves

Solution

The air is not of uniform density as we go upwards. as we go upwards there is a gradual decrease in air density which results in refraction thereby leading to the rolling sound of thunder.
Question 8
1 / -0

Properties of a kind of wave are given below. Identify the type of wave
i. Wave can not be detected by human ear
ii. Velocity of wave in free space is 3x108m/s
iii. Velocity is not effected by temperature
iv. Waves can travel through vacuum

A
Radio waves

B
Water waves

C
Sound waves

D
Tidal waves

Solution

These are the properties of radio waves. No possible explanation.
Question 9
1 / -0

Y (x,t) = Syntax error from line 1 column 49 to line 1 column 73. Unexpected ‘mathsize’. represents a moving pulse where X and y are n metres and t in second. Then which of the following dose not hold true?

A
its maximum displacement is 0.16 m

B
pulse is moving positive X-direction

C
it is a symmetric pulse

D
in 2 s it will travel a distance of 2.5 m

Solution

t = 0 & x = 0
y = 0.16 m
ymax = 0.16 m
Pulse is symmetric because y (x) = y (-x)
t = 1s
x=-1.25m
y is again 0.16m
Therefore speed is 1.25m/s
So it travels 2.5 m in 2 sec
Question 10
1 / -0

The speed of transverse waves on a string depends upon

A
Length of string, mass

B
Mass density , length of string

C
Linear mass density, tension

D
Wavelength, velocity

Solution

The speed of a wave on a string depends on the square root of the tension divided by the mass per length, the linear density.

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Re-Attempt Weekly Quiz Competition

Waves Test - 15

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Waves Test - 15

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SHARING IS CARING

Question 1

the wave intensity remains constant for a plane wave

total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times

the wave intensity decreases as the inverse of the square of the distance from the source for a spherical wave

the wave intensity decreases as the inverse of the distance from the source for a spherical wave

Question 2

10Hz

216Hz

60Hz

360Hz

Solution

Question 3

Pressure on the string

tension in it and its linear mass density

Shear modulus and linear mass density

Young’s modulus and linear mass density

Solution

Question 4

Oscillating

Damp

Infinite

Dubbed

Solution

Question 5

Telescope

Stethoscope

Microscope

Horoscope

Solution

Question 6

ωk

λT

λf

ωT

Solution

Question 7

Reflection of waves

Air currents

Air currents

Refraction of waves

Solution

Question 8

Radio waves

Water waves

Sound waves

Tidal waves

Solution

Question 9

its maximum displacement is 0.16 m

pulse is moving positive X-direction

it is a symmetric pulse

in 2 s it will travel a distance of 2.5 m

Solution

Question 10

Length of string, mass

Mass density , length of string

Linear mass density, tension

Wavelength, velocity

Solution

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