- 1(current)
Q. No.Given below are two statements:
| Statement I: | Sound waves travelling from air into water, incident obliquely, bend towards the normal. |
| Statement II: | Sound waves travel more slowly in water than in air. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Â Speed of Sound |
Level 3: 35%-60%
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When sound waves produced under water emerge into the air, then:
| 1. | the frequency increases, and wavelength decreases. |
| 2. | the frequency remains constant, but the wavelength decreases. |
| 3. | the frequency decreases, wavelength remains constant. |
| 4. | the frequency remains constant but the wavelength increases. |
Subtopic: Â Speed of Sound |
Level 3: 35%-60%
Hints
A gas is taken in a closed transparent tube, some lycopodium powder is spread within the tube, and the tube is placed horizontally. When the mouth of the tube is vibrated with a tuning fork of frequency \(1~\text{kHz,}\) and the length of the tube is adjusted: the powder is observed to collect in a wave-like pattern with adjacent 'maxima' separated by \(20~\text{cm}.\) The speed of sound in the gas is:
| 1. | \(100~\text{m/s}\) | 2. | \(200~\text{m/s}\) |
| 3. | \(400~\text{m/s}\) | 4. | \(800~\text{m/s}\) |
Subtopic: Â Speed of Sound |
Level 3: 35%-60%
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Hints
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A stone is dropped from the top of a hillock and the sound of it striking the ground is heard \(4.25~\text s\) later. The speed of sound in air is \(320~\text {m/s}\) and the value of \(g\) is \(10~\text {m/s}^2.\)
The time, required by the stone to reach the bottom, is:
1. \(4~\text s\)
2. \(2.125~\text s\)
3. \(0.25~\text s\)
4. \(2~\text s\)
The time, required by the stone to reach the bottom, is:
1. \(4~\text s\)
2. \(2.125~\text s\)
3. \(0.25~\text s\)
4. \(2~\text s\)
Subtopic: Â Speed of Sound |
 53%
Level 3: 35%-60%
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The ratio of the speed of sound in nitrogen gas to that in helium gas, at \(300\) K is:
| 1. | \(\sqrt{\dfrac{2}{7}}\) | 2. | \(\sqrt{\dfrac{1}{7}}\) |
| 3. | \(\dfrac{\sqrt{3 }}{5}\) | 4. | \(\dfrac{\sqrt{6 }}{5}\) |
Subtopic: Â Speed of Sound |
Level 3: 35%-60%
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The speed of sound in air within a room:
| 1. | changes with pressure and temperature |
| 2. | changes with pressure only |
| 3. | changes with temperature only |
| 4. | is unaffected by changes in pressure and temperature |
Subtopic: Â Speed of Sound |
 56%
Level 3: 35%-60%
Hints
If the ambient pressure of air increases by \(2\%,\) the speed of sound in air:
| 1. | increases by \(2\%\) |
| 2. | increases by \(1\%\) |
| 3. | remains unchanged |
| 4. | decreases by \(1\%\) |
Subtopic: Â Speed of Sound |
 58%
Level 3: 35%-60%
Hints
The square of the speed of sound in a mono-atomic gas is proportional to:
| 1. | its internal energy |
| 2. | its internal energy per unit volume |
| 3. | its internal energy per unit mass |
| 4. | its internal energy per unit temperature |
Subtopic: Â Speed of Sound |
 59%
Level 3: 35%-60%
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- 1(current)
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