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Question (1)

QN0038602

The property of a medium necessary for wave propagation is

(A)
inertia
(B)
low resistance
(C)
elasticity
(D)
All of the above

Correct Answer: D

Explanation:

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Question (2)

QN0038603

The ratio of the speed of a body to the speed of sound is called

(A)
Mach number
(B)
Doppler ratio
(C)
sonic index
(D)
refractive index

Correct Answer: A

Explanation:

mach number

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Question (3)

QN0038604

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 . The speed of sound in a tissue is . The wavelength of sound in tissue is close to

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

Correct Answer: A

Explanation:

Frequency (n) and speed of sound . Wave length of sound in tissue

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Question (4)

QN0038605

When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' ' at time ' ' is given by :
where and are in meters and in seconds. The speed of sound in the medium is :

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

Correct Answer: B

Explanation:

Standard equation,

From any of the displacement equation

Say

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Question (5)

QN0038606

At , the shape of a travelling pulse is given by .
where and are in metres. The wave function for the travelling pulse if the velocity of propagation is in the direction is given by

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

Correct Answer: D

Explanation:

For a travelling wave in the -direction,

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Question (6)

QN0038607

A circular loop of rope of length rotates with uniform angular velocity about an axis through its centre on a horizontal smooth platform. Velocity of pulse (with respect to rope) produced due to slight radial displacement is given by

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

Correct Answer: B

Explanation:

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Question (7)

QN0038608

The extension in a string, obeying Hooke's law, is . The speed of sound in the stretched string is . If the extension in the string is increased to , the speed of sound will be

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

Correct Answer: A

Explanation:

According to Hooke's law

[Restoring force , tension of spring]

Velocity of sound by a stretched string

where is the mass per unit length

Hence or,

or

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Question (8)

QN0038609

The equation of a wave on a string of linear mass density is given by
The tension in the string is

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

Correct Answer: D

Explanation:

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Question (9)

QN0038610

Two strings and , made of same material, are stretched by same tension. The radius of string is double of radius of . transverse wave travels on with speed and on with speed . The ratio is

(A)
(B)
2
(C)
(D)
4

Correct Answer: A

Explanation:

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Question (10)

QN0038611

The relation between velocity of sound in a gas (v) and r.m.s. velocity of molecules of gas ( ) is

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

Correct Answer: A

Explanation:

Velocity of sound in a gas is

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Question (1)

The property of a medium necessary for wave propagation is

Explanation:

Link:

Question (2)

The ratio of the speed of a body to the speed of sound is called

Explanation:

Link:

Question (3)

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 . The speed of sound in a tissue is . The wavelength of sound in tissue is close to

Explanation:

Link:

Question (4)

When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' ' at time ' ' is given by :where and are in meters and in seconds. The speed of sound in the medium is :

Explanation:

Link:

Question (5)

At , the shape of a travelling pulse is given by .where and are in metres. The wave function for the travelling pulse if the velocity of propagation is in the direction is given by

Explanation:

Link:

Question (6)

A circular loop of rope of length rotates with uniform angular velocity about an axis through its centre on a horizontal smooth platform. Velocity of pulse (with respect to rope) produced due to slight radial displacement is given by

Explanation:

Link:

Question (7)

The extension in a string, obeying Hooke's law, is . The speed of sound in the stretched string is . If the extension in the string is increased to , the speed of sound will be

Explanation:

Link:

Question (8)

The equation of a wave on a string of linear mass density is given by The tension in the string is

Explanation:

Link:

Question (9)

Two strings and , made of same material, are stretched by same tension. The radius of string is double of radius of . transverse wave travels on with speed and on with speed . The ratio is

Explanation:

Link:

Question (10)

The relation between velocity of sound in a gas (v) and r.m.s. velocity of molecules of gas ( ) is

Explanation:

Link:

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When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' ' at time ' ' is given by :
where and are in meters and in seconds. The speed of sound in the medium is :

At , the shape of a travelling pulse is given by .
where and are in metres. The wave function for the travelling pulse if the velocity of propagation is in the direction is given by

The equation of a wave on a string of linear mass density is given by
The tension in the string is