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1. The main natural source of energy for life on Earth is
A. Wind
B. The Sun
C. Water
D. Fossil fuels
2. The energy possessed by an object because of its ability to do work is called
A. Power
B. Heat
C. Energy
D. Force
3. The unit of energy is the same as that of
A. Force
B. Power
C. Work
D. Velocity
4. 1 kilojoule (kJ) is equal to
A. 10 J
B. 100 J
C. 1000 J
D. 10000 J
5. When a moving object does work, it must possess
A. Heat energy
B. Sound energy
C. Kinetic energy
D. Chemical energy
6. The energy possessed by an object due to its motion is called
A. Mechanical energy
B. Kinetic energy
C. Potential energy
D. Thermal energy
7. The kinetic energy of an object increases with
A. Decrease in velocity
B. Increase in speed
C. Increase in mass only
D. Decrease in mass
8. The relation between work and change in kinetic energy is
A. Work = mass × acceleration
B. Work = change in kinetic energy
C. Work = velocity × displacement
D. Work = potential energy
9. The formula for kinetic energy of an object is
A. mv²
B. ½ mv²
C. mgh
D. F × s
10. If the velocity of an object becomes double, its kinetic energy becomes
A. Double
B. Half
C. Four times
D. Same
11. A moving object of mass 15 kg and velocity 4 m/s has kinetic energy equal to
A. 15 J
B. 30 J
C. 60 J
D. 120 J
12. An object with energy can do work because it can
A. Lose energy
B. Apply force and cause displacement
C. Stop motion of other bodies
D. Remain at rest
13. When you stretch a rubber band, the energy stored in it is
A. Heat energy
B. Potential energy
C. Kinetic energy
D. Chemical energy
14. The energy possessed by an object due to its position or configuration is
A. Kinetic energy
B. Potential energy
C. Mechanical energy
D. Thermal energy
15. A stretched bow possesses
A. Kinetic energy only
B. Potential energy only
C. Both kinetic and potential energy
D. No energy
16. When a wound-up spring of a toy car is released, the stored energy changes into
A. Light energy
B. Heat energy
C. Kinetic energy
D. Chemical energy
17. The potential energy of a lifted object is due to
A. Gravity
B. Friction
C. Air resistance
D. Elasticity
18. The formula for gravitational potential energy is
A. F × s
B. ½ mv²
C. mgh
D. mg/s
19. The gravitational potential energy of a body depends on
A. Its mass and height
B. Its speed
C. Its density
D. Its shape only
20. When an object is raised through a height h, the work done on it equals
A. Zero
B. Its potential energy mgh
C. Its kinetic energy ½mv²
D. Its weight only
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