250+ TOP MCQs on Energy Conservation and Answers

Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Energy Conservation”.

1. Law of conservation of energy states that
a) Total energy of the universe is always constant
b) Total energy of the universe is always increasing
c) Total energy of the universe is always decreasing
d) None of the mentioned
Answer: a
Clarification: Law of conservation of energy states that total energy of the universe is always constant.

2. A mass having an initial kinetic energy of 40 Jules gets a potential energy of 10 Jules by reaching at a height h. What is the kinetic energy of the mass now?
a) 10 J
b) 20 J
c) 30 J
d) 40 J
Answer: b
Clarification: Law of conservation of energy states that total energy of the universe is always constant.

3-8. A block having a mass of 1 kg and velocity 2 m/s2 is at the ground.
3. What is the kinetic energy of the block?
a) 1 J
b) 2 J
c) 3 J
d) 4 J
Answer: b
Clarification: K.E. = ½ mv2.

4. If the block gets a height of 5 m, what is the potential energy of the block?
a) 49 J
b) 98 J
c) 87 J
d) 98 J
Answer: a
Clarification: P.E = mgh.

5. If the block gets a height of 0.2 m using some of the kinetic energy what is the kinetic energy of the block after reaching the extreme point?
a) 0.01 J
b) 0.02 J
c) 0.03 J
d) 0.04 J
Answer: d
Clarification: K.E. + P.E. = Total Energy = Constant.

6. The total energy of the block _________ in every operation.
a) Increases
b) Decreases
c) Remains constant
d) None of the mentioned
Answer: c
Clarification: The total energy of the block constant in every operation.

7. If the block uses the whole energy to gain some height, what will be that height?
a) 0.104 m
b) 0.204 m
c) 0.304 m
d) 0.404 m
Answer: b
Clarification: mgh = 2 J.

8. If the block is initially at a height of 2 m and with zero velocity. What is the maximum velocity it can gain?
a) 2.26
b) 4.26
c) 6.26
d) 8.26
Answer: c
Clarification: 1/2 mv2 = mgh.

9. If the velocity of the block is doubled, the kinetic energy of the block will be
a) Half
b) Double
c) Four times
d) None of the mentioned
Answer: c
Clarification: KE = ½ mv2.

10. If the height gained by the block is half of the initial case, the potential energy will also be ________ of the initial potential energy.
a) Half
b) Double
c) Four times
d) None of the mentioned
Answer: a
Clarification: PE = mgh.