MCQ Collection
ECAT MCQs
Practice ECAT questions with answers and explanations.
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Correct Answer: C. Buoyant force equals the weight of displaced fluid
Explanation:
Immersion displaces fluid and creates an upward resultant pressure force.
That force equals the displaced fluid's weight.
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Correct Answer: C. 100 N
Explanation:
Force equals pressure times area.
F=5000×0.02 = 100 N.
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Correct Answer: D. Its average density is less than or equal to the fluid density and buoyant force balances weight
Explanation:
A floating object displaces enough fluid for buoyancy to equal its weight.
The submerged fraction depends on relative density.
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Correct Answer: D. 50,000 Pa
Explanation:
Hydrostatic pressure is ρgh.
P=1000×10×5 = 50,000 Pa.
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Correct Answer: A. 100 J
Explanation:
Work is W=Fd when force and displacement are parallel.
W=20×5 = 100 J.
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Correct Answer: B. 20 J
Explanation:
Use W=Fd cosθ.
W=10×4×cos60° = 20 J.
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Correct Answer: C. 18 J
Explanation:
Kinetic energy is ½mv².
K=½×4×9 = 18 J.
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Correct Answer: D. 100 J
Explanation:
K=½mv².
K=½×2×100 = 100 J.
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Correct Answer: A. 400 J
Explanation:
Potential energy change is mgh.
5×10×8 = 400 J.
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Correct Answer: B. 200 W
Explanation:
Power is work divided by time.
P=600/3 = 200 W.
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Correct Answer: C. 20,000 J
Explanation:
Energy transferred is Pt.
1000×20 = 20,000 J.
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Correct Answer: D. 100 J
Explanation:
Net work equals the change in kinetic energy.
Kf=20+80 = 100 J.
