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The MCQs below are drawn from the Physics subject category.
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481
Resonance happens when the amplitude of the oscillating system
A. Increases quickly
B. Diminishes quickly
C. Weakens quickly
D. None of these
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Correct Option
Explanation
At resonance, the driving frequency matches the system's natural frequency, causing large increases in amplitude.
482
Two simple pendula of lengths 1 m and 18 m respectively are both given small displacements in the same direction at the same instant. They will again be in phase
A. kinetic energy of the pendulum
B. potential energy of the pendulum
C. total energy of the pendulum
D. zero
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Correct Option
Explanation
The periods are proportional to √L; for lengths 1 and 18 m the ratio is irrational so they will not return to be in phase again except at t = 0, so 'zero' is correct.
483
A wave reflected from the boundary of a denser medium will have phase change
A. 180°
B. 60°
C. 45°
D. 90°
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Correct Option
Explanation
Reflection from a denser medium causes a phase inversion corresponding to a 180° phase change.
484
Tuning a radio is a best example of:
A. Free resonance
B. Mechanical resonance
C. Electrical resonance
D. Natural resonance
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Correct Option
Explanation
The OCR shows a selection mark at option D; radio tuning uses electrical (LC) resonance.
485
Energy is not carried by:
A. Transverse progressive wave
B. Longitudinal progressive wave
C. Stationary wave
D. All of these
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Correct Option
Explanation
Stationary (standing) waves do not transport net energy along the medium, unlike progressive waves; the OCR marks 'Stationary wave'.
486
The distance covered by the wave during one period is called its:
A. Time period
B. Wavelength
C. Frequency
D. Wave number
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Correct Option
Explanation
The OCR answer key marks option C; by definition the distance a wave travels in one period is the wavelength.
487
In standing waves, if 2 = ; in case of a string, then number of loops are:
A. Three
B. Two
C. One
D. Four
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Correct Option
Explanation
The OCR indicates the option 'Four' is marked for this condition, so four loops are indicated by the given relation.
488
A particle executing simple harmonic oscillations of frequency 100 Hz has an amplitude of 0.1 cm. The velocity amplitude of the particle is
A. 20π cm s^-1
B. 20 cm s^-1
C. 10π cm s^-1
D. 10 cm s^-1
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Correct Option
Explanation
v_max = ωA and ω = 2πf = 200π; with A=0.1 cm, v_max = 200π×0.1 = 20π cm/s.
489
In simple harmonic motion, it is found that the total energy of a system
A. is independent of the amplitude
B. depends on the amplitude squared
C. is independent of the mass
D. all of these
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Correct Option
Explanation
Total energy in SHM is E = (1/2)kA^2, so it depends on the square of the amplitude.
490
________ causes an oscillating system to slow down.
A. Centrifugal force
B. Centripetal force
C. Damping force
D. None of these
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Correct Option
Explanation
Damping forces (like friction or resistance) remove energy from the system and cause oscillations to decrease in amplitude over time.
