Physics Practice: Energy (Mock Test 5 - Comprehensive Mastery)
1. The S.I. unit of work is Joule, which is equivalent to:
2. A body of mass $m$ is moving with a constant velocity $v$. If it is brought to rest, the work done is:
3. When a pendulum oscillates, which of the following remains constant at all points (ignoring air resistance)?
4. Which of the following is an example of conversion of chemical energy into heat and light energy?
5. One unit of electrical energy (1 kWh) is equal to ________ Joules.
6. A girl of mass $40 \text{ kg}$ climbs a staircase of $20 \text{ steps}$, each $15 \text{ cm}$ high. The work done is ($g = 10 \text{ m/s}^2$):
7. Non-renewable sources of energy are also called ________ sources.
8. In a battery-operated flashlight, the energy transformation sequence is:
9. Power is defined as the product of ________ and ________.
10. Water stored in the reservoir of a dam possesses:
11. A machine lifting a $50 \text{ kg}$ weight to $10 \text{ m}$ in $5 \text{ s}$ has a power of:
12. Nuclear energy is derived from the ________ of an atom.
13. Which of the following is NOT a unit of energy?
14. To double the kinetic energy of an object, its velocity must be increased by a factor of:
15. Solar energy is essentially ________ energy.
16. When work is done against friction, it is primarily converted into:
17. $1 \text{ Horsepower (hp)}$ in CGS units is approximately ________.
18. The energy possessed by a body due to its motion is called:
19. Work done by a force is negative when the angle between force and displacement is:
20. What is the ultimate source of most of the energy on Earth?