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Simple harmonic motion and waves
10 Class 10 Physics questions with answers and explanations.
Printable worksheet with answer key
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A pendulum completes 20 vibrations in 10 s. What is its frequency?
- 1 10 Hz
- 2 2 Hz
- 3 200 Hz
- 4 0.5 Hz
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Correct answer: 2 Hz
Frequency = number of vibrations / time = 20 / 10 = 2 Hz.
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The time period T and frequency f are related by:
- 1 T = 2 f
- 2 T = 1 / f
- 3 T = f²
- 4 T = f
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A wave has frequency 50 Hz and wavelength 4 m. What is its speed?
- 1 12.5 m/s
- 2 200 m/s
- 3 46 m/s
- 4 54 m/s
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Sound waves are:
- 1 Transverse waves
- 2 Not waves
- 3 Electromagnetic waves
- 4 Longitudinal waves
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Correct answer: Longitudinal waves
Particles of the medium vibrate along the direction of travel, so sound is longitudinal.
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In a transverse wave, the particles of the medium vibrate:
- 1 At right angles to the direction of the wave
- 2 They do not move
- 3 In circles only
- 4 Along the direction of the wave
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Correct answer: At right angles to the direction of the wave
In a transverse wave the vibration is perpendicular to the direction of travel.
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The period of a simple pendulum depends on its:
- 1 Material
- 2 Mass
- 3 Colour
- 4 Length
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Correct answer: Length
T = 2 pi times the square root of (L / g), so it depends on length and g, not mass.
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The maximum displacement of a vibrating body from its mean position is its:
- 1 Period
- 2 Amplitude
- 3 Wavelength
- 4 Frequency
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The SI unit of frequency is the:
- 1 Second
- 2 Metre
- 3 Newton
- 4 Hertz
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The distance between two consecutive crests of a wave is its:
- 1 Amplitude
- 2 Frequency
- 3 Period
- 4 Wavelength
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A pendulum of length 1 m is made 4 times longer. Its time period becomes:
- 1 Twice
- 2 Four times
- 3 The same
- 4 Half