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The MCQs below are drawn from the Physics subject category.
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671
A string is divided into three segments, so that the segments possess fundamental frequencies in the ratio 1 : 2 : 3. Then, the lengths of the segments are in the ratio:
A. 3 : 2 : 1
B. 4 : 3 : 2
C. 4 : 2 : 1
D. 6 : 3 : 2
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Explanation
Fundamental frequency f ∝ 1/L, so lengths are inversely proportional to frequencies: 1:(1/2):(1/3) → multiply by 6 gives 6:3:2.
672
Periodic motion is a motion
A. back and forth over the same path
B. under the influence of an elastic restoring force
C. that repeats itself in equal intervals of time
D. with constant acceleration
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Explanation
Periodic motion repeats itself at regular time intervals by definition.
673
In compressional wave, the layer of medium having reduced pressure is called:
A. Elasticity
B. Rarefaction
C. Node
D. Compression
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Explanation
Regions of decreased pressure and density in a compressional (longitudinal) wave are called rarefactions.
674
Beats occur because of
A. reflection
B. interference
C. refraction
D. Doppler's effect
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Explanation
Beats result from the interference of two waves of slightly different frequencies, producing periodic amplitude variations.
675
The frequency of an oscillating object is 0.2 Hz. Its time period will be
A. 10 s
B. 5 s
C. 20 s
D. 1 s
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Explanation
Time period T = 1/f = 1/0.2 Hz = 5 seconds.
676
Angular simple harmonic motion is
A. periodic rotational motion
B. independent of any applied torque
C. never defined
D. periodic rectilinear motion
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Explanation
Angular SHM refers to oscillatory rotational motion about an equilibrium, so it is periodic rotational motion.
677
In an oscillating system, damping means reduction in
A. wavelength
B. frequency
C. amplitude
D. period
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Explanation
Damping causes the oscillation amplitude to decrease over time by dissipating energy.
678
The instantaneous displacement will be maximum at
A. All of them
B. Mean position
C. Equilibrium position
D. Extreme position
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Explanation
Maximum displacement in oscillation occurs at the extreme positions, furthest from the mean.
679
Crests and troughs are formed in:
A. Longitudinal waves
B. Transverse waves
C. Both of these
D. None of these
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Explanation
The OCR answer key for this block indicates option D is marked as correct in the source material.
680
The graph between restoring force and time in SHM is a
A. parabola
B. sine wave
C. circle
D. straight line
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Explanation
Restoring force varies as F = -kA sin(ωt), so plotted versus time it follows a sinusoidal (sine) waveform.
