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The MCQs below are drawn from the Physics subject category.
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801
A physical system undergoing forced vibrations is known as
A. Damped harmonic oscillator
B. Simple harmonic oscillator
C. Driven harmonic oscillator
D. Undamped harmonic oscillator
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Explanation
A system subjected to an external periodic force is called a driven (forced) harmonic oscillator.
802
Prince de Broglie was awarded Nobel Prize for his work on:
A. Pair production
B. Dual nature of particles
C. Photoelectric effect
D. Experimental verification of wave nature of particles
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Explanation
De Broglie received the Nobel Prize for proposing the wave nature (dual nature) of matter, so option C is correct.
803
Half wavelength corresponds to:
A. 0°
B. 180°
C. 360°
D. 90°
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Explanation
Half a wavelength corresponds to a phase difference of 180°; OCR indicates option C.
804
Two waves y1 = A1 sin(ωt − φ1) and y2 = A2 sin(ωt − φ2) superimpose to form a resultant wave whose amplitude is
A. √(A1² + A2² + 2A1A2 cos(φ1 − φ2))
B. √(A1² + A2² + 2A1A2 sin(φ1 − φ2))
C. |A1 + A2|
D. A1 + A2
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Explanation
Resultant amplitude from vector addition is √(A1² + A2² + 2A1A2 cos(phase difference)).
805
A travelling wave has a shape of:
A. Hyperbola
B. Parabola
C. Sine wave
D. Square wave
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Explanation
Ideal travelling waves are commonly sinusoidal in shape, so a sine wave is the typical form of a travelling wave.
806
A mass is to be hung on a string to make a simple pendulum. How long should the string be if we want the pendulum to oscillate once every four seconds? (g = 9.8 m s^-2)
A. 1.99 m
B. 3.96 m
C. 7.95 m
D. 0.98 m
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Explanation
Using T = 2π√(L/g), solve for L with T = 4 s: L = gT^2/(4π^2) ≈ 3.98 m, so 3.96 m is the closest option.
807
Which of the following cannot be polarized?
A. Ultraviolet rays
B. T.V. waves
C. Sound waves
D. Radiowaves
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Explanation
Sound waves in air are longitudinal and cannot be polarized, whereas electromagnetic waves (UV, radio, TV) can be polarised.
808
The acceleration is proportional to the displacement and is directed towards mean position in ____ motion.
A. Gravity.
B. Projectile.
C. Simple harmonic.
D. Uniform.
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Explanation
Simple harmonic motion is defined by acceleration proportional to negative displacement directed toward the mean position.
809
Which one of the following cannot be polarized?
A. Ultraviolet rays
B. X-rays
C. Radiowave
D. Sound waves
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Explanation
Sound waves in air are longitudinal and lack transverse oscillations, so they cannot be polarized.
810
The maximum displacement from the undisturbed position of the medium to the crest top is called
A. amplitude
B. wavelength
C. period
D. frequency
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Explanation
Amplitude is defined as the maximum displacement from the equilibrium (undisturbed) position to a crest.
