Class 12 Physics · Chapter 2 · Test 3
Damping and Resonance
41 MCQs
41 questions · 35 min · 41 marks
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Sample questions
The first 5 of 41. Try each one, then tap to see the answer.
Question 1
A body is said to execute free vibrations when it oscillates:
- AWith its natural frequency without interference of an external force
- BUnder a periodic driving force
- CWith decreasing amplitude
- DAt twice its natural frequency
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Answer: A
Free vibrations occur at the natural frequency without any external force.
Question 2
Which of the following is an example of free oscillation?
- AA swing pushed repeatedly
- BA factory floor vibrating due to machinery
- CA slightly displaced simple pendulum
- DA car body vibrating due to its engine
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Answer: C
A slightly displaced simple pendulum vibrates freely with its natural frequency.
Question 3
The natural frequency of a simple pendulum depends only on its:
- AMass
- BLength
- CAmplitude
- DColour of bob
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Answer: B
T = 2π sqrt(l/g) so for a given place the natural frequency depends only on length.
Question 4
In an ideal free oscillation with no resistance the total energy:
- AGradually decreases
- BGradually increases
- CIs zero
- DRemains constant
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Answer: D
Without resistive forces the energy is conserved and the amplitude stays constant.
Question 5
Forced vibrations take place when a freely oscillating system is:
- ASubjected to an external force
- BLeft undisturbed
- CPlaced in a vacuum
- DCooled
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Answer: A
An external periodic force on a system produces forced vibrations.
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