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Q. No.Given below are two statements:
| Assertion (A): | Sound travels faster on a hot summer day than on a cold winter day. |
| Reason (R): | The velocity of sound is directly proportional to the square root of its absolute temperature. |
| 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: Speed of Sound |
76%
From NCERT
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Given below are two statements:
| Assertion (A): | Where two vibrating tuning forks having frequencies \(256~\text{Hz}\) and \(512~\text{Hz}\) are held near each other, beats cannot be heard. |
| Reason (R): | The principle of superposition is valid only if the frequencies of the oscillators are nearly equal. |
| 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. | Both (A) and (R) are False. |
Subtopic: Beats |
From NCERT
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Given below are two statements:
| Assertion (A): | Beats can also be observed by two light sources as in sound. |
| Reason (R): | Light sources have constant phase difference. |
| 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. | Both (A) and (R) are false. |
Subtopic: Beats |
51%
From NCERT
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Given below are two statements:
| Assertion (A): | In the case of a stationary wave, a person hears a loud sound at the nodes as compared to the antinodes. |
| Reason (R): | In a stationary wave, all the particles of the medium vibrate in phase. |
| 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. | Both (A) and (R) are false. |
Subtopic: Standing Waves |
From NCERT
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Given below are two statements:
| Assertion (A): | The flash of lightning is seen before the sound of thunder is heard. |
| Reason (R): | Speed of sound is greater than speed of light. |
| 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. | Both (A) and (R) are false. |
Subtopic: Speed of Sound |
79%
From NCERT
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Given below are two statements:
| Assertion (A): | Our ears distinguish two notes, one produced by a violin and other by guitar, if they have exactly same intensity and same frequency. |
| Reason (R): | When a musical instrument is played, it produces a fundamental note which is accompanied by a number of overtones called harmonics. |
| 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. | Both (A) and (R) are false. |
Subtopic: Standing Waves |
59%
From NCERT
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Given below are two statements:
| Assertion (A): | In a stationary wave there is no transfer of energy. |
| Reason (R): | The distance between two consecutive nodes or antinodes is \(\begin{aligned}\frac{\lambda}{\sqrt{2}} \end{aligned}\). |
| 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. | Both (A) and (R) are False. |
Subtopic: Standing Waves |
67%
From NCERT
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Given below are two statements:
| Assertion (A): | Quality of sound depends on the number and frequency of overtones produced. |
| Reason (R): | Pitch of the sound depends on the frequency of the source. |
| 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. | Both (A) and (R) are false. |
Subtopic: Wave Motion |
71%
From NCERT
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Given below are two statements:
| Assertion (A): | In a progressive wave motion, the particle velocity remains constant at all times. |
| Reason (R): | During the propagation of sound, the density of the medium is uniform throughout. |
| 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. | Both (A) and (R) are False. |
Subtopic: Wave Motion |
54%
From NCERT
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A pipe, \(30.0\) cm long, is open at both ends.
| (i) | Which harmonic mode of the pipe resonates a \(1.1\) kHz source? |
| (ii) | Will resonance with the same source be observed if one end of the pipe is closed? |
Take the speed of sound in air as \(330\) m s–1.
| (i) | (ii) | |
| 1. | First | No |
| 2. | Second | No |
| 3. | First | Yes |
| 4. | Second | Yes |
Subtopic: Standing Waves |
67%
From NCERT
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