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Oscillations
8 Class 11 Physics questions with answers and explanations.
Printable worksheet with answer key
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In simple harmonic motion the acceleration is proportional to:
- 1 The displacement, directed to the mean position
- 2 The velocity
- 3 The time
- 4 The mass only
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Correct answer: The displacement, directed to the mean position
a = -omega2 x.
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The time period of a mass m on a spring of constant k is:
- 1 2 pi sqrt(m / k)
- 2 pi sqrt(m / k)
- 3 2 pi m k
- 4 2 pi sqrt(k / m)
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Correct answer: 2 pi sqrt(m / k)
T = 2 pi times the square root of (m / k).
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A pendulum has period 2 s. What is its length? (g = pi squared, about 9.87 m/s²)
- 1 1 m
- 2 2 m
- 3 0.5 m
- 4 4 m
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Correct answer: 1 m
T = 2 pi sqrt(L / g). With g = π², T = 2 sqrt(L), so L = 1 m.
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At the mean position of SHM, the speed is:
- 1 Constant
- 2 Zero
- 3 Half of maximum
- 4 Maximum
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Correct answer: Maximum
Speed is greatest at the mean position and zero at the extremes.
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Resonance occurs when the driving frequency equals the:
- 1 Zero
- 2 Natural frequency
- 3 Half the natural frequency
- 4 Double the natural frequency
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Correct answer: Natural frequency
When the two match, the amplitude becomes large.
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The total energy of a body in SHM is proportional to the square of its:
- 1 Time
- 2 Amplitude
- 3 Frequency only
- 4 Mass only
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Damped oscillations have an amplitude that:
- 1 Increases with time
- 2 Stays constant
- 3 Doubles each cycle
- 4 Decreases with time
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The frequency of a vibrating system is 5 Hz. Its period is:
- 1 25 s
- 2 0.5 s
- 3 0.2 s
- 4 5 s