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The MCQs below are drawn from the Physics subject category.
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531
A sonometer or audiometer is a device based on the principle of
A. harmonics
B. overtones
C. beats
D. resonance
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Correct Option
Explanation
A sonometer/audiometer operates on the principle of resonance to compare or measure frequencies.
532
Which of the following expressions is that of a simple harmonic stationary wave?
A. A sin ωt
B. A sin (ωt - kx)
C. A cos ωt kx
D. 2A sin ωt cos kx
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Correct Option
Explanation
A stationary wave is the superposition of two opposite travelling waves of equal amplitude, giving the form 2A sin ωt cos kx, so option B is correct.
533
Light produced by a single Nicol is
A. circulatory polarized
B. unpolarized
C. plane polarized
D. elliptically polarized
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Correct Option
Explanation
A single Nicol prism acts as a polarizer and produces plane-polarized light.
534
Resonance phenomenon in a vibrating body
A. may increase the amplitude
B. may decrease the amplitude
C. may not affected the amplitude
D. all of the above
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Explanation
Resonance occurs when driving frequency matches natural frequency and typically causes a large increase in amplitude.
535
A wave that remains in a constant position is called
A. shock wave
B. longitudinal wave
C. transverse wave
D. standing wave
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Explanation
A wave that oscillates in place without traveling is called a standing wave.
536
Small amplitude progressive waves in a stretched string have a speed of 100 cm s^-1 and frequency 100 Hz. The phase difference between two points 2.75 cm apart on the string, in radian, is
A. 1/4
B. 11π/2
D. 37/8
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Explanation
λ = v/f = (100 cm/s)/(100 Hz) = 1 cm, so Δφ = 2π(Δx/λ) = 2π(2.75/1) = 5.5π = 11π/2.
537
The waves having a discrete set of frequencies can be set up in a medium. This fact is known as:
A. Conservation of frequencies
B. Quantization of frequencies
C. Damping of frequencies
D. None of these
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Explanation
The OCR marks 'Quantization of frequencies'; discrete allowed frequencies in standing waves are referred to as quantization.
538
When length and diameter of a wire is increased, and is stretched, then its frequency:
A. Increases
B. Decreases
C. None of these
D. Remains same
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Explanation
The OCR indicates 'Decreases' is marked; increasing mass (via increased diameter/length) while stretching can lower frequency.
539
In stationary waves
A. energy is uniformly distributed
B. energy is maximum at nodes and minimum at antinodes
C. energy is minimum at nodes and maximum at antinodes
D. alternating maximum and minimum energy produced at nodes and antinodes
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Explanation
In stationary waves nodes have zero amplitude (so minimal energy) while antinodes have maximum amplitude, hence maximum energy at antinodes and minimum at nodes.
540
The instantaneous displacement will be zero at
A. Mean position
B. None of them
C. Extreme position
D. Both of them
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Correct Option
Explanation
Instantaneous displacement is zero at the mean position; at extreme positions displacement is maximum.
