MCQ Collection
Pakistan MCQs
Practice Pakistan questions with answers and explanations.
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Correct Answer: B. 200 Hz
Explanation:
For an open pipe, fundamental wavelength is 2L=1.7 m.
F=340/1.7 = 200 Hz.
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Correct Answer: C. Time taken for one complete cycle
Explanation:
The period is measured in seconds.
It is the reciprocal of frequency.
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Correct Answer: D. Number of complete cycles per second
Explanation:
Frequency is measured in hertz.
One hertz means one cycle per second.
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Correct Answer: A. Large-amplitude response when driving frequency matches a natural frequency
Explanation:
At resonance, energy transfer from the driver is especially effective.
Damping limits the amplitude.
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Correct Answer: B. Reduction of oscillation amplitude due to energy loss
Explanation:
Damping removes mechanical energy from an oscillator.
Friction and drag are common causes.
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Correct Answer: C. A disturbance that requires a material medium
Explanation:
Mechanical waves transfer energy through oscillating matter.
Sound and water waves are examples.
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Correct Answer: D. 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: A. 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: B. 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: C. 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: D. 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: A. A spontaneous cell reaction under standard conditions
Explanation:
Positive E° corresponds to negative standard Gibbs energy.
The written cell reaction is thermodynamically favorable.
