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Q. No.The speed of sound in a medium depends on:
1.
the elastic property but not the inertial property
2.
the inertial property but not the elastic property
3.
both the elastic and inertial properties
4.
neither the elastic property nor the inertial property
Subtopic: Â Speed of Sound |
 75%
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Given below are two statements:
| Assertion (A): | Sound waves in a gas are pressure waves, but these are also accompanied by changes in local temperature. |
| Reason (R): | Sound waves are propagated in gas through an adiabatic process and hence accompanied by temperature variations. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Pressure Wave in Sound |
 83%
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A rope of uniform mass per unit length \(\mu\) is suspended from the ceiling, hanging under its own weight. If a small transverse pulse is formed at its lower end \(A\), it travels upward with a local speed \(v=\sqrt {\dfrac{\text{tension}}{\text{mass/length}}}\).
The speed of the pulse is:
The speed of the pulse is:
| 1. | maximum at \(A,\) minimum at \(O\) |
| 2. | minimum at \(A,\) maximum at \(O\) |
| 3. | uniform |
| 4. | minimum at \(A\) and \(O,\) maximum in the middle |
Subtopic: Â Travelling Wave on String |
 72%
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The intensity \((I)\) of a sound wave depends on the distance \((x)\) from the source as:
| 1. | \(I\propto x\) | 2. | \(I\propto \dfrac1x\) |
| 3. | \(I\propto \dfrac1{x^2}\) | 4. | none of the above |
Subtopic: Â Energy of Waves |
 74%
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The separation between a node and the next antinode in a vibrating air column is \(20\) cm. The speed of sound is \(320\) m/s. The frequency of sound is:
1. \(128\) Hz
2. \(256\) Hz
3. \(400\) Hz
4. \(800\) Hz
Subtopic: Â Standing Waves |
 77%
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Which of the following statement is correct?
| 1. | The energy of any small part of a string remains constant in a travelling wave. |
| 2. | The energy of any small part of a string remains constant in a standing wave. |
| 3. | The energies of all the small parts of equal length are equal in a travelling wave. |
| 4. | The energies of all the small parts of equal length are equal in a standing wave. |
Subtopic: Â Energy of Waves |
 59%
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A wave moving in a gas:
| 1. | must be longitudinal | 2. | may be longitudinal |
| 3. | must be transverse | 4. | may be transverse |
Subtopic: Â Types of Waves |
 53%
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The velocity of sound in air is \(332~\text{m/s}.\) Its velocity in the vacuum will be:
1. \(>332~\text{m/s}\)
2. \(=332~\text{m/s}\)
3. \(<332~\text{m/s}\)
4. meaningless
1. \(>332~\text{m/s}\)
2. \(=332~\text{m/s}\)
3. \(<332~\text{m/s}\)
4. meaningless
Subtopic: Â Types of Waves |
 63%
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Two strings \(A\) and \(B,\) made of the same material, are stretched by the same tension. The radius of string \(A\) is double of the radius of \(B.\) A transverse wave that travels on \(A\) with a speed \(v_A\) and on \(B\) with a speed \(v_B.\) The ratio of \(\frac{v_A}{v_B}\) is:
| 1. | \(\frac{1}{2}\) | 2. | \(2\) |
| 3. | \(\frac{1}{4}\) | 4. | \(4\) |
Subtopic: Â Speed of Sound |
 67%
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Which of the following is a mechanical wave?
1. Radio waves
2. \(X\text-\)rays
3. Light waves
4. Sound waves
Subtopic: Â Types of Waves |
 87%
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