Q1. The potential energy of a 10 kg mass raised to a height of 5 m (g = 10 m/s²) is:
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Answer: B. 500 J
PE = 10 × 10 × 5 = 500 J.
Physics - Work, Energy & Power Questions for SSC CGL (with Answers)
10 Physics - Work, Energy & Power MCQs from the General Awareness section, with answers and short explanations.
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Q2. A motor does 1200 J of work in 60 s. Its power is:
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Answer: C. 20 W
P = 1200/60 = 20 W.
Q3. A force of 50 N moves a box 4 m in the direction of the force. The work done is:
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Answer: D. 200 J
W = 50 × 4 = 200 J.
Q4. Work done is zero when the force and displacement are:
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Answer: C. Perpendicular to each other
When θ = 90°, cos θ = 0, so no work is done.
Q5. A ball is dropped from a height (ignoring air resistance). As it falls, its total mechanical energy:
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Answer: C. Remains constant
PE turns into KE but their sum stays constant, as per conservation of mechanical energy.
Q6. The energy conversion in a hydroelectric power station is mainly from:
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Answer: C. Potential energy of water to electrical energy
Water stored at a height has potential energy, which turns turbines (kinetic) and generators produce electricity.
Q7. The kinetic energy of a body of mass 2 kg moving at 5 m/s is:
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Answer: D. 25 J
KE = ½ × 2 × 5² = 25 J.
Q8. If the velocity of a body is doubled, its kinetic energy becomes:
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Answer: B. Four times
KE ∝ v², so doubling v makes KE four times.
Q9. A 60 kg man climbs a staircase 5 m high in 10 s. Taking g = 10 m/s², his power is:
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Answer: C. 300 W
P = (60 × 10 × 5)/10 = 300 W.
Q10. A body of mass 1 kg has kinetic energy of 50 J. Its speed is:
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Answer: A. 10 m/s
50 = ½ × 1 × v², so v² = 100 and v = 10 m/s.
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