Q. No.Which of the following statements is/are correct.
| a. | Motion of a kink in a longitudinal spring produced by displacing one end of the spring sideways is transverse and longitudinal, both. |
| b. | Waves produced in a cylinder containing a liquid by moving its piston back and forth is longitudinal. |
| c. | Waves produced by a motorboat sailing in water are transverse and longitudinal, both. |
| d. | Ultrasonic waves in air produced by a vibrating quartz crystal are longitudinal. |
1. (a), (b) and (d)
2. (b) and (d)
3. (a), (c) and (d)
4. All are correct
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| Assertion (A): | When a pendulum is made to oscillate on the surface of the moon, its time period increases. |
| Reason (R): | Moon is much smaller as compared to Earth. |
| 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. |
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| Assertion (A): | If a pendulum is suspended in a lift and the lift is falling freely, then its time period becomes infinite. |
| Reason (R): | The free-falling body has acceleration equal to the acceleration due to gravity. |
| 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. |
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| Assertion (A): | The graph between velocity and displacement for a simple harmonic motion is an ellipse. |
| Reason (R): | Velocity does not change uniformly with displacement in simple harmonic motion. |
| 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. |
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| Assertion (A): | When a girl sitting on a swing stands up, the periodic time of the swing decreases. |
| Reason (R): | When a girl stands up, more weight is felt on the string of the swing. |
| 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. |
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| Assertion (A): | The graph of potential energy and kinetic energy of a particle in SHM with respect to position is a parabola. |
| Reason (R): | Potential energy and kinetic energy do not vary linearly with 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. | Both (A) and (R) are false. |
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| Assertion (A): | The time period of a pendulum, on a satellite orbiting the earth, is infinity. |
| Reason (R): | Time-period of a pendulum is inversely proportional to \(\sqrt g\). |
| 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. |
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| Assertion (A): | Acceleration of a particle in SHM is always zero. |
| Reason (R): | Two SHMs must have the same phase if the amplitude is same. |
| 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. |
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| Assertion (A): | In simple harmonic motion, the motion is to and fro and periodic. |
| Reason (R): | In simple harmonic motion, the particle's velocity is given by \(v=\omega \sqrt {A^2-x^2},\) (where \(x\) is the displacement of the particle). |
| 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. |
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| 1. |  |
2. |  |
| 3. |  |
4. |  |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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