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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%
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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Two sine waves travel in the same direction in a medium. The amplitude of each wave is \(A\) and the phase difference between the two waves is \(120^\circ.\) The resultant amplitude will be:
1. \(A\)
2. \(2A\)
3. \(4A\)
4. \(\sqrt2 A\)
Subtopic: Â Wave Motion |
 86%
From NCERT
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A transverse wave travels along the Z-axis. The particles of the medium must move:
| 1. | along the Z-axis | 2. | along the X-axis |
| 3. | along the Y-axis | 4. | in the X-Y plane |
Subtopic: Â Wave Motion |
 83%
From NCERT
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When two waves with same frequency and constant phase difference interfere,
| 1. | there is a gain of energy. |
| 2. | there is a loss of energy. |
| 3. | the energy is redistributed and the distribution changes with time. |
| 4. | the energy is redistributed and the distribution remains constant in time. |
Subtopic: Â Energy of Waves |
 72%
From NCERT
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The phenomenon of beats can take place:
| 1. | for longitudinal waves only. |
| 2. | for transverse waves only. |
| 3. | for both longitudinal and transverse waves. |
| 4. | for sound waves only. |
Subtopic: Â Beats |
 60%
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 |
 84%
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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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Two identical wires are stretched by the same tension \(100\) N and each emits a node of frequency \(200\) Hz. If the tension in one wire is increased by \(1\) N, then the beat frequency is:
1. \(2\) Hz
2. \(\dfrac12\) Hz
3. \(1\) Hz
4. none of these
Subtopic: Â Beats |
 60%
From NCERT
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A uniform rope of mass \(0.1~\text{kg}\) and length \(2.45~\text m\) hangs from the ceiling. The time taken by the transverse wave produced at the bottom of the string to reach the top of the rope is:
(take \(g=9.8~\text{m/s}^2\) )
1. \(1~\text s\)
2. \(1.4~\text s\)
3. \(2~\text s\)
4. \(1.9~\text s\)
(take \(g=9.8~\text{m/s}^2\) )
1. \(1~\text s\)
2. \(1.4~\text s\)
3. \(2~\text s\)
4. \(1.9~\text s\)
Subtopic: Â Travelling Wave on String |
 65%
From NCERT
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