MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: B. 2 s
Explanation:
Period is total time divided by number of cycles.
30/15 = 2 s.
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Correct Answer: C. A wave whose particle oscillations are perpendicular to propagation
Explanation:
Transverse waves have crests and troughs.
Waves on strings are common examples.
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Correct Answer: C. 2 Hz
Explanation:
Frequency is reciprocal of period.
F=1/0.5 = 2 Hz.
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Correct Answer: D. A wave whose particle oscillations are parallel to propagation
Explanation:
Longitudinal waves contain compressions and rarefactions.
Sound in air is longitudinal.
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Correct Answer: D. 2.01 s
Explanation:
Use T=2π√(L/g).
T=2π√(1/9.8)≈2.01 s.
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Correct Answer: A. Distance between successive points in the same phase
Explanation:
Wavelength may be measured between adjacent crests or compressions.
It is related to speed and frequency.
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Correct Answer: A. 20 rad/s
Explanation:
For a spring oscillator, ω=√(k/m).
√(200/0.5)=√400=20 rad/s.
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Correct Answer: B. Distance traveled by a wave disturbance per unit time
Explanation:
Wave speed depends on the medium for mechanical waves.
It equals frequency times wavelength.
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Correct Answer: C. Superposition of waves producing reinforcement or cancellation
Explanation:
When waves overlap, their displacements add.
Constructive interference reinforces, while destructive interference reduces amplitude.
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Correct Answer: D. Spreading of waves around obstacles or through openings
Explanation:
Diffraction is strongest when the opening or obstacle is comparable to wavelength.
It is a general wave property.
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Correct Answer: A. 400 J
Explanation:
Energy conservation gives W=Qin-Qout.
W=1200-800 = 400 J.
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Correct Answer: B. 3
Explanation:
Refrigerator COP is heat removed divided by work input.
COP=600/200 = 3.
