MCQ Collection
ECAT Physics MCQs
Practice ECAT Physics questions with answers and explanations.
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Correct Answer: A. 300 K
Explanation:
Kelvin temperature is Celsius temperature plus about 273.
27+273 = 300 K.
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Correct Answer: A. Maximum displacement from equilibrium
Explanation:
Amplitude measures the largest excursion from equilibrium.
It affects energy but not the ideal SHM period.
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Correct Answer: B. 37°C
Explanation:
Celsius temperature is kelvin temperature minus about 273.
310-273 = 37°C.
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Correct Answer: B. 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: C. 42,000 J
Explanation:
Use Q=mcΔT.
Q=2×4200×5 = 42,000 J.
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Correct Answer: C. 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: D. 30°C
Explanation:
Use ΔT=Q/(mc).
6000/(0.5×400)=30°C.
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Correct Answer: D. 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: A. 1,002,000 J
Explanation:
Use Q=mL.
Q=3×334,000 = 1,002,000 J.
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Correct Answer: B. 2 × 10^-5 °C^-1
Explanation:
Use α=ΔL/(LΔT).
α=0.002/(2×50)=2×10^-5 °C^-1.
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Correct Answer: C. 200 kPa
Explanation:
Boyle's law gives P1V1=P2V2.
P2=100×4/2 = 200 kPa.
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Correct Answer: D. 4 L
Explanation:
Charles's law gives V/T constant.
V2=3×400/300 = 4 L.
