1. Energy stored in a stretched spring is:
A) Kinetic energy
B) Chemical energy
C) Elastic potential energy
D) Electrical energy
✅ Answer: C
2. Work is said to be done when:
A) Force is applied on a body
B) Body moves without force
C) Force causes displacement
D) Mass increases
✅ Answer: C
3. The SI unit of work is:
A) Watt
B) Joule
C) Newton
D) Pascal
✅ Answer: B
4. One joule is equal to:
A) 1 N/m
B) 1 N × m
C) 1 kg × m
D) 1 kg/m
✅ Answer: B
5. Work done is zero when:
A) Force and displacement are perpendicular
B) Force and displacement are parallel
C) Force is large
D) Displacement is large
✅ Answer: A
6. The formula for work is:
A) W = F/d
B) W = F × d
C) W = m × g
D) W = P/t
✅ Answer: B
7. Energy is defined as the ability to:
A) Push a body
B) Do work
C) Stop motion
D) Increase mass
✅ Answer: B
8. The SI unit of energy is:
A) Watt
B) Joule
C) Volt
D) Ampere
✅ Answer: B
9. Kinetic energy depends upon:
A) Speed only
B) Mass only
C) Mass and velocity
D) Height only
✅ Answer: C
10. The formula of kinetic energy is:
A) mgh
B) ½ mv²
C) Fd
D) Pt
✅ Answer: B
11. Potential energy of a body at height depends upon:
A) Mass, gravity and height
B) Speed only
C) Force only
D) Time
✅ Answer: A
12. The formula for gravitational potential energy is:
A) ½ mv²
B) mgh
C) Fd
D) P/t
✅ Answer: B
13. Power is defined as:
A) Force × Time
B) Work × Time
C) Work done per unit time
D) Energy × Time
✅ Answer: C
14. The SI unit of power is:
A) Joule
B) Newton
C) Watt
D) Pascal
✅ Answer: C
15. 1 Watt is equal to:
A) 1 Joule/second
B) 1 Newton/m
C) 1 Joule × second
D) 1 kg m²
✅ Answer: A
16. Commercial unit of electrical energy is:
A) Joule
B) Watt
C) Kilowatt-hour
D) Newton
✅ Answer: C
17. 1 kilowatt-hour equals:
A) 3.6 × 10⁶ J
B) 360 J
C) 1000 J
D) 60 J
✅ Answer: A
18. Work done against gravity increases the:
A) Kinetic energy
B) Potential energy
C) Power
D) Speed
✅ Answer: B
19. If velocity doubles, kinetic energy becomes:
A) Double
B) Half
C) Four times
D) Same
✅ Answer: C
20. When a body falls freely, its potential energy:
A) Increases
B) Decreases
C) Remains constant
D) Becomes zero instantly
✅ Answer: B
21. The rate of doing work is called:
A) Energy
B) Force
C) Power
D) Motion
✅ Answer: C
22. Horsepower is a unit of:
A) Work
B) Energy
C) Power
D) Force
✅ Answer: C
23. 1 horsepower is approximately equal to:
A) 746 W
B) 1000 W
C) 500 W
D) 600 W
✅ Answer: A
24. Mechanical energy is the sum of:
A) Heat and Light energy
B) Kinetic and Potential energy
C) Electrical and Chemical energy
D) Sound and Heat energy
✅ Answer: B
25. According to the law of conservation of energy:
A) Energy is destroyed
B) Energy is created
C) Energy can neither be created nor destroyed
D) Energy increases automatically
✅ Answer: C
26. When force and displacement are in the same direction, work done is:
A) Zero
B) Negative
C) Positive
D) Infinite
✅ Answer: C
27. When a body is lifted to a certain height, it gains:
A) Kinetic energy
B) Chemical energy
C) Potential energy
D) Nuclear energy
✅ Answer: C
28. The formula of power is:
A) P = W/t
B) P = F × d
C) P = mgh
D) P = mv²
✅ Answer: A
29. If no displacement occurs, work done is:
A) Maximum
B) Minimum
C) Zero
D) Infinite
✅ Answer: C
30. A moving body possesses:
A) Potential energy
B) Kinetic energy
C) Heat energy only
D) Nuclear energy
✅ Answer: B