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Q. No.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: Speed of Sound |
56%
From NCERT
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The displacement of a particle is given by \(y = 5\times 10^{-4}\sin\left(100t-50x\right),\) 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: Wave Motion |
90%
From NCERT
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The equation of a progressive wave is given by \(y = 4\sin\left\{ \pi\left(\frac{t}{5}-\frac{x}{9}\right)+\frac{\pi}{6}\right\}\), where \(x\) and \(y\) are in metres and \(t\) in seconds.
Which of the following is correct?
1. \(v = 5~\text{m/s}\)
2. \(\lambda = 18~\text{m}\)
3. \(A = 0.04~\text{m}\)
4. \(\nu= 50~\text{Hz}\)
Which of the following is correct?
1. \(v = 5~\text{m/s}\)
2. \(\lambda = 18~\text{m}\)
3. \(A = 0.04~\text{m}\)
4. \(\nu= 50~\text{Hz}\)
Subtopic: Wave Motion |
86%
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: Beats |
71%
From NCERT
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Two tuning forks, \(A\) and \(B\), vibrating simultaneously produce \(5\) beats. The frequency of \(B\) is \(512~\text{Hz}\). It is seen that if one arm of \(A\) is filed a little, then the number of beats increases. The frequency of \(A\) in Hz will be:
| 1. | \(502\) | 2. | \(507\) |
| 3. | \(517\) | 4. | \(522\) |
Subtopic: Beats |
70%
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 \(\text{cm}\) and \(t\) is in \(\text{sec}.\) 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: Standing Waves |
78%
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: Standing Waves |
75%
From NCERT
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A boy is walking away from a wall towards an observer at a speed of 1 metre/sec and blows a whistle whose frequency is 680 Hz. The number of beats heard by the observer per second is (Velocity of sound in air = 340 metres/sec)
1. Zero
2. 2
3. 8
4. 4
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An organ pipe that is closed at one end has a fundamental frequency of \(1500~\text{Hz}\). The maximum number of overtones generated by this pipe that a normal person can hear is:
| 1. | \(14\) | 2. | \(13\) |
| 3. | \(6\) | 4. | \(9\) |
Subtopic: Standing Waves |
60%
From NCERT
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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: Speed of Sound |
56%
From NCERT
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