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Question (1)

QN0038672

Water waves produced by a motorboat sailing in water are

(A)
neither longitudinal nor transverse
(B)
both longitudinal and transverse
(C)
only longitudinal
(D)
only transverse

Correct Answer: B

Explanation:

As the water waves are produced by a motor boat on surfaces of water as well as inside the water are both longitudinal and transverse, because the waves, produce transverse as well as lateral vibrations in the particles of the medium.

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Question (2)

QN0038673

Sound waves of wavelength travelling in a medium with a speed of enter into another medium where its speed in . Wavelength of sound waves in the second medium is

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Let the frequency in the first medium is and in the second medium is .

As we know that, when waves passes from one medium to another its frequency does not change but its velocity and wavelength changes.

Hence,

(frequency are same for both medium)

and , are wavelengths and and speeds in first and second medium respectively.

So,

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Question (3)

QN0038674

Speed of sound wave in air

(A)
is independent of temperature
(B)
increases with pressure
(C)
increases with increase in humidity
(D)
decreases with increase in humidity

Correct Answer: C

Explanation:

The speed of sound (longitudinal) wave in air is

The density of water vapours is small (rises up) than the air, so on increasing humidity the density of medium increase the speed of sound in air.

For air and are constants,

, where is density of air.

where is density of dry air and is density of moist air.

As

Hence, speed of sound wave in air increases with increase in humidity.

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Question (4)

QN0038675

Change in temperature of the medium changes

(A)
frequency of sound waves
(B)
amplitude of sound waves
(C)
wavelength of sound waves
(D)
loudness of sound waves

Correct Answer: C

Explanation:

As we know that,

Speed of sound wave in a medium

(where is temperature of the medium)

Clearly, when temperature increase then the speed also increase as frequency does not change during propogation of wave by formula.

As,

where is frequency and is wavelength.

Frequency remains fixed,

or

So velocity and wavelength both increases.

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Question (5)

QN0038676

With propagation of longitudinal waves through a medium, the quantity transmitted is

(A)
matter
(B)
energy
(C)
energy and matter
(D)
energy, matter and momentum

Correct Answer: B

Explanation:

Only energy is transmitted from one point to another and during propagation of any longitudinal waves in a medium transmission of energy through the medium without matter being transmitted.

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Question (6)

QN0038677

Which of the following statements are true for wave motion?

(A)
Mechanical transverse waves can propagate through all mediums.
(B)
Longitudinal waves can propagate through solids only.
(C)
Mechanical transverse waves can propagate through solids only.
(D)
Longitudinal waves can propagate through vacuum.

Correct Answer: C

Explanation:

Mechanical transverse wave can propagates through a solid medium, the constituent of the medium oscillate perpendicular to wave motion causing change in shape. Thus each, element of the medium is subjected to shearing stress. Solids and strings have shear modulus, so sustain shearing stress.

Fluids have no shape of their own, they yield to shearing stress. Hence, transverse waves are possible in solids and strings but not in fluids.

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Question (7)

QN0038678

A sound wave is passing through air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,

(A)
density remains constant
(B)
Boyle's law is obeyed
(C)
bulk modulus of air oscillates
(D)
there is no transfer of heat

Correct Answer: D

Explanation:

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Question (8)

QN0038679

Equation of a plane progressive wave is given by . On reflection from a denser medium its amplitude becomes of the amplitude of the incident wave. The equation of the reflected wave is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

As given that

Amplitude of reflected wave

units

Given incident wave

As we know that the reflected wave equation at denser medium where phase difference is

The positive sign is due to reversal of direction of propagation

So,

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Question (9)

QN0038680

A string of mass is under tension of . The length of the stretched string is . If the transverse jerk is struck at one end of the string, the disturbance will reach the other end in

(A)
(B)
(C)
(D)
data given is insufficient

Correct Answer: B

Explanation:

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Question (1)

Water waves produced by a motorboat sailing in water are

Explanation:

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Question (2)

Sound waves of wavelength travelling in a medium with a speed of enter into another medium where its speed in . Wavelength of sound waves in the second medium is

Explanation:

Link:

Question (3)

Speed of sound wave in air

Explanation:

Link:

Question (4)

Change in temperature of the medium changes

Explanation:

Link:

Question (5)

With propagation of longitudinal waves through a medium, the quantity transmitted is

Explanation:

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Question (6)

Which of the following statements are true for wave motion?

Explanation:

Link:

Question (7)

A sound wave is passing through air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,

Explanation:

Link:

Question (8)

Equation of a plane progressive wave is given by . On reflection from a denser medium its amplitude becomes of the amplitude of the incident wave. The equation of the reflected wave is

Explanation:

Link:

Question (9)

A string of mass is under tension of . The length of the stretched string is . If the transverse jerk is struck at one end of the string, the disturbance will reach the other end in

Explanation:

Link:

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