MCQ Collection
ECAT MCQs
Practice ECAT questions with answers and explanations.
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Correct Answer: A. 4 Hz
Explanation:
Frequency is cycles divided by time.
20/5 = 4 Hz.
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Correct Answer: B. 0.2 s
Explanation:
Period is the reciprocal of frequency.
T=1/5 = 0.2 s.
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Correct Answer: C. 4 m
Explanation:
Use v=fλ.
λ=12/3 = 4 m.
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Correct Answer: D. 20 m/s
Explanation:
Wave speed is v=fλ.
V=8×2.5 = 20 m/s.
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Correct Answer: A. 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: A. 500 Hz
Explanation:
Frequency is speed divided by wavelength.
F=340/0.68 = 500 Hz.
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Correct Answer: B. 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: 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.
