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Q. No.The velocity of sound in air is:
1.
faster in dry air than in moist air.
2.
directly proportional to the pressure.
3.
directly proportional to temperature.
4.
independent of the pressure of air.
Subtopic: Â Speed of Sound |
 54%
From NCERT
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The speed of sound at a constant temperature depends on:
| 1. | Pressure | 2. | Density of gas |
| 3. | Above both | 4. | None of the above |
Subtopic: Â Speed of Sound |
 55%
From NCERT
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The displacement of a particle is given by \(y = 5\times 10^{-4}\sin(100t-50x),\) where \(x\) is in metres and \(t\) is in seconds. The velocity of the wave is:
1. \(5000~\text{m/s}\)
2. \(2~\text{m/s}\)
3. \(0.5~\text{m/s}\)
4. \(300~\text{m/s}\)
1. \(5000~\text{m/s}\)
2. \(2~\text{m/s}\)
3. \(0.5~\text{m/s}\)
4. \(300~\text{m/s}\)
Subtopic: Â Wave Motion |
 89%
From NCERT
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Tuning fork \(F_1\) has a frequency of \(256~\text{Hz}\) and it is observed to produce \(6\) beats/second with another tuning fork \(F_2\). When \(F_2\) is loaded with wax, it still produces \(6\) beats/second with \(F_1\). The frequency of \(F_2\) before loading was:
1. \(253~\text{Hz}\)
2. \(262~\text{Hz}\)
3. \(250~\text{Hz}\)
4. \(259~\text{Hz}\)
1. \(253~\text{Hz}\)
2. \(262~\text{Hz}\)
3. \(250~\text{Hz}\)
4. \(259~\text{Hz}\)
Subtopic: Â Beats |
 71%
From NCERT
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The equation of a stationary wave is \(y = 0.8\cos\left(\frac{\pi x}{20}\right)\sin200(\pi t)\), where \(x\) is in cm and \(t\) is in sec. The separation between consecutive nodes will be:
1. \(20~\text{cm}\)
2. \(10~\text{cm}\)
3. \(40~\text{cm}\)
4. \(30~\text{cm}\)
1. \(20~\text{cm}\)
2. \(10~\text{cm}\)
3. \(40~\text{cm}\)
4. \(30~\text{cm}\)
Subtopic: Â Standing Waves |
 77%
From NCERT
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A closed pipe and an open pipe have their first overtones identical in frequency. Their lengths are in the ratio:
| 1. | \(1:2\) | 2. | \(2:3\) |
| 3. | \(3:4\) | 4. | \(4:5\) |
Subtopic: Â Standing Waves |
 73%
From NCERT
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Three waves of equal frequency having amplitudes of \(10~\mu \text{m}, 4~\mu \text{m}~\text{and}~7~\mu\text{m}\) arrive at a given point with a successive phase difference of \(\frac{\pi}{2}\). The amplitude of the resulting wave \((\text{in}~\mu \text{m})\) is given by:
1. \(7\)
2. \(6\)
3. \(5\)
4. \(4\)
1. \(7\)
2. \(6\)
3. \(5\)
4. \(4\)
Subtopic: Â Standing Waves |
 60%
From NCERT
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The wave described by \(y = 0.25\sin(10\pi x-2\pi t),\) where \(x\) and \(y\) are in metres and \(t\) in seconds, is a wave traveling along the:
| 1. | \(-\text{ve}~x\) direction with frequency \(1\) Hz. |
| 2. | \(+\text{ve}~x\) direction with frequency \(\pi\) Hz and wavelength \(\lambda = 0.2~\text{m}\). |
| 3. | \(+\text{ve}~x\) direction with frequency \(1\) Hz and wavelength \(\lambda = 0.2~\text{m}\). |
| 4. | \(-\text{ve}~x\) direction with amplitude \(0.25\) m and wavelength \(\lambda = 0.2~\text{m}\). |
Subtopic: Â Wave Motion |
 84%
From NCERT
NEET - 2008
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The number of possible natural oscillations of the air column in a pipe closed at one end of a length of \(85~\text{cm}\) whose frequencies lie below \(1250~\text{Hz}\) is: (velocity of sound \(340~\text{ms}^{-1}\))
| 1. | \(4\) | 2. | \(5\) |
| 3. | \(7\) | 4. | \(6\) |
Subtopic: Â Standing Waves |
 63%
From NCERT
NEET - 2014
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A string is stretched between fixed points separated by \(75.0~\text{cm}.\) It is observed to have resonant frequencies of \(420~\text{Hz}\) and \(315~\text{Hz}\). There are no other resonant frequencies between these two. The lowest resonant frequency for these strings is:
| 1. | \(155~\text{Hz}\) | 2. | \(205~\text{Hz}\) |
| 3. | \(10.5~\text{Hz}\) | 4. | \(105~\text{Hz}\) |
Subtopic: Â Standing Waves |
 76%
From NCERT
NEET - 2015
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