Physics Test 3 – Work, Power & Energy

Format: 10 MCQs | +4 Correct | –1 Incorrect | ✅ Instant Scoring

1. Which of the following has no unit of energy?
a) Watt b) Joule c) kiloWatt hour d) Erg

2. Work done = 0 when:
a) Force is applied at 90° to displacement b) Force is zero c) Displacement is zero d) All of these

3. SI unit of power is:
a) Joule b) Newton c) Watt d) Pascal

4. What is the work done against gravity to lift 5 kg mass to 2 m height? (g = 10 m/s²)
a) 20 J b) 50 J c) 100 J d) 200 J

5. 1 kilowatt hour = how many joules?
a) 1000 J b) 3600 J c) 36000 J d) 3.6 × 10⁶ J

6. Energy possessed due to motion is:
a) Potential energy b) Mechanical energy c) Heat energy d) Kinetic energy

7. Work is said to be negative when:
a) Force and displacement are opposite b) Force is zero c) Displacement = 0 d) All of these

8. Unit of energy in commercial use is:
a) kWh b) Joule c) Calorie d) Newton

9. Power = Work / ___
a) Force b) Time c) Mass d) Energy

10. One horsepower = ___ watt?
a) 500 b) 1000 c) 746 d) 60

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