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Q. No.Which of the following is a mechanical wave?
1. Radio waves
2. \(X\text-\)rays
3. Light waves
4. Sound waves
1. Radio waves
2. \(X\text-\)rays
3. Light waves
4. Sound waves
Subtopic: Â Types of Waves |
 87%
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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