Assertion (A): | Sound would travel faster on a hot summer day than on a cold winter day. |
Reason (R): | 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. |
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. |
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. |