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The MCQs below are drawn from the Physics subject category.
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581
Which of the following waves cannot be polarised?
A. Microwaves
B. X-rays
C. Sound waves
D. Gamma-rays
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Correct Option
Explanation
Sound waves in air are longitudinal and therefore cannot exhibit polarization, which applies to transverse waves.
582
The amplitude of a vibrating body at resonance in vacuum is
A. infinite
B. maximum
C. minimum
D. zero
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Explanation
At resonance, a system vibrates with maximum amplitude for a given input.
583
A wave which consists of a single, non repetitive disturbance is called a
A. longitudinal wave
B. pulse
C. continuous wave
D. transverse wave
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Explanation
A single, non-repetitive disturbance is termed a pulse.
584
When a body oscillates without the interference of an external force, it is said to be executing
A. Forced oscillations
B. Spontaneous oscillation
C. Damped oscillations
D. Free oscillations
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Explanation
Oscillations occurring without external driving forces are called free oscillations, determined by the system's own properties.
585
Light can travel in vacuum, a distance of about
A. 800,000 km
B. 200,000 km
C. 300,000 km
D. 600,000 km
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Explanation
The speed of light in vacuum is approximately 300,000 km per second, so light travels about 300,000 km in one second.
586
An object at the end of a spring oscillates with SHM of angular frequency 2 rad s^-1. What is the period of oscillation?
A. 0.50 s
B. 0.80 s
C. 0.32 s
D. 3.1 s
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Explanation
Period T = 2π/ω = 2π/2 = π ≈ 3.14 s, so option D (3.1 s) is correct.
587
Of the following properties of a wave, the one that is independent of the others is its:
A. Frequency
B. Wavelength
C. Velocity
D. Amplitude
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Explanation
Amplitude is independent of wavelength, frequency, and wave velocity; it represents the wave's maximum displacement.
588
For a body executing SHM, the instantaneous velocity is maximum when
A. None of them
B. Both of them
C. The body is at mean position
D. X = 0
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Explanation
X = 0 and 'body at mean position' are equivalent; maximum speed occurs at the mean position.
589
The property of light which does not change with the nature of the medium is:
A. Frequency
B. Amplitude
C. Wavelength
D. None of these
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Explanation
When light enters a different medium its frequency remains the same; wavelength and speed change.
590
A simple pendulum is made of a body which is a hollow sphere containing mercury suspended by means of a wire. If a little mercury is drained off, the period of the pendulum will
A. decrease
B. remain unchanged
C. become erratic
D. increase
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Correct Option
Explanation
Period of a simple pendulum depends on length and g, not on the mass of the bob, so draining mercury does not change the period.
