Assertion (A): | The change in air pressure affects the speed of sound. |
Reason (R): | The speed of sound in gases is proportional to the square of pressure. |
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. |
Assertion (A): | Ocean waves hitting a beach are always found to be nearly normal to the shore. |
Reason (R): | Ocean waves are longitudinal waves. |
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. |
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. |
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. |
Statement I: | The speed of sound waves in a medium depends on the elastic modulus and the density of the medium. |
Statement II: | The speed of sound in a gas is independent of its temperature. |
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. |
1. | Wave \(C\) lags behind in phase by \(\pi/2\) and wave \(B\) leads by \(\pi/2\). |
2. | Wave \(C\) leads in phase by \(\pi\) and wave \(B\) lags behind by \(\pi\). |
3. | Wave \(C\) lags behind in phase by \(\pi/2\) and wave \(B\) leads by \(\pi\). |
4. | Wave \(C\) lags behind in phase by \(\pi\) and wave \(B\) leads by \(\pi\). |
Assertion (A): | In a stationary wave, there is no transfer of energy. |
Reason (R): | The ratio of kinetic energy to potential energy is independent of the position. |
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. |