MCQ Collection
ECAT Physics MCQs
Practice ECAT Physics questions with answers and explanations.
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Correct Answer: C. Every two masses attract with force proportional to their product and inversely proportional to distance squared
Explanation:
Universal gravitation applies to any pair of masses.
The force acts along the line joining their centers.
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Correct Answer: C. Ratio of tensile stress to tensile strain within the elastic region
Explanation:
Young's modulus measures material stiffness.
A larger value means less strain for a given stress.
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Correct Answer: D. Force per unit mass on a test mass
Explanation:
Gravitational field strength is g=F/m.
Its unit is N/kg, equivalent to m/s².
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Correct Answer: D. 4.002 × 10^-10 N
Explanation:
Use F=Gm₁m₂/r².
F=6.67×10^-11×2×3 = 4.002×10^-10 N.
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Correct Answer: A. 40 J
Explanation:
ΔK=½m(v²-u²).
With m=2, ΔK=49-9 = 40 J.
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Correct Answer: B. 24 kg·m/s
Explanation:
Momentum is p=mv.
P=6×4 = 24 kg·m/s.
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Correct Answer: C. The turning effect of a force about an axis
Explanation:
Torque depends on force, lever arm, and angle.
It is the rotational counterpart of force.
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Correct Answer: C. 18 N·s
Explanation:
Impulse equals change in momentum.
J=3(8-2)=18 N·s.
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Correct Answer: D. Perpendicular distance from the axis to the force's line of action
Explanation:
Torque magnitude equals force times perpendicular lever arm.
A larger moment arm produces greater turning effect.
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Correct Answer: D. 10 N·s
Explanation:
Impulse is FΔt for constant force.
50×0.2 = 10 N·s.
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Correct Answer: A. Rate of change of angular displacement
Explanation:
Angular velocity describes how fast and in which sense an object rotates.
Its SI unit is rad/s.
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Correct Answer: A. 2 m/s
Explanation:
Conserve momentum: 2×6 = (2+4)v.
V=12/6 = 2 m/s.
