1. | \(\frac{\mathit{\pi}}{6}\) | 2. | \(\frac{{2}\mathit{\pi}}{3}\) |
3. | \(\frac{\mathit{\pi}}{4}\) | 4. | \(\frac{\mathit{\pi}}{3}\) |
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. |
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 Hz and 512 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. |