250+ TOP MCQs on Energy Types and Answers

Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) on “Energy Types”.

1. Which of the following is not the type of energy?
a) Enthalpy
b) Heat
c) Entropy
d) Work

Answer: c
Clarification: Entropy is not a type of energy.

2. Which of the following process P-V work in highest?
a) Second derivative is negative
b) Second derivative is positive
c) Second derivative is zero
d) All of the mentioned

Answer: a
Clarification: Work in highest when the area under the P-V curve is highest, which is when the second derivative of the curve is negative.

3. An object is moved from one position to another with a specific force, what type of work is it?
a) Shaft Work
b) Flow Work
c) Mechanical Work
d) None of the mentioned

Answer: c
Clarification: Since work is caused by mechanical force it is a mechanical work.

4. An object is moved at a distance of 10 m with the force of 5 N, what is the work done by the force?
a) 5 Joule
b) 50 Joule
c) 500 Joule
d) 5000 Joule

Answer: b
Clarification: Work = 10*5 = 50 N-m = 50 Joule.

5. An object moved forward 10 meters and then comes back 5 meter all with a constant force of 5 N, what is the work done by the force?
a) 5 Joule
b) 25 Joule
c) 50 Joule
d) 75 Joule

Answer: b
Clarification: Work = (10 – 5)* 5 = 25 Joule.

6. A piston cylinder is compressed with some pressure, what is the work done on the system?
a) Positive
b) Negative
c) Zero
d) Cannot say

Answer: a
Clarification: Since pressure and displacement are positive their products are also positive, => work done on the system is positive.

7. A piston cylinder expands with some pressure, what is the work done by the system?
a) Positive
b) Negative
c) Zero
d) Cannot Say

Answer: a
Clarification: Since direction of displacement and force are same, work done will be positive.

8. A piston cylinder contracts from 10 Liter to 5 Liter with an external pressure of 10 Pa, what is the work done on the system?
a) 0.5 mJ
b) 5 mJ
c) 10 mJ
d) 50 mJ

Answer: d
Clarification: Work = 10*(10 – 5) = 50 mJ.

9. A piston cylinder expands from 7 liter to 15 liter with the external pressure of 500 Pa, what is the work done by the system?
a) – 1.5 Joule
b) – 4 Joule
c) 1.5 Joule
d) 4 Joule

Answer: b
Clarification: Work = 500*(15 – 7) = 4000 mJ = 4 Joule.

10. A piston cylinder expands from 8 liter to 12 liter with the external pressure of 900 Pa, what is the work done on the system?
a) 3.6 Joule
b) – 3.6 Joule
c) 7.2 Joule
d) – 7.2 Joule

Answer: b
Clarification: Work done on the system = 900(8 – 12) = – 3600 mJ = – 3.6 J.

11. You shake a thermos so that the temperature of tea inside increases by 2^oC, if you transferred Q amount of heat to the thermos, which of the following satisfies Q?
a) Q > 0
b) Q < 0
c) Q = 0
d) Cannot say

Answer: c
Clarification: If you are shaking a thermos, you are doing work on it not transferring any heat.

12. Q amount of heat is transferred in an adiabatic process, which of the following is correct?
a) Q > 0
b) Q = 0
c) Q < 0
d) Cannot say

Answer: b
Clarification: In an adiabatic process Q = 0.

13. Q amount of heat is transferred to a system, which of the following is correct?
a) Q > 0
b) Q < 0
c) Q = 0
d) Cannot say

Answer: a
Clarification: Since heat is transferred to a system, => Q > 0.

14. Temperature of a system is increased with no change in internal energy, if the work done by the system is 10 Joule, what amount of heat is taken out from the system?
a) 10 J
b) – 10 J
c) 0
d) 5 J

Answer: b
Clarification: W = – 10, => 0 = Q + W, => Q = 10 J, => amount of heat taken out = – 10 J.

15. Ratio heat transferred from 37^oC to a colder body and from that body to – 11^oC is 2, what is the temperature of colder body if surface areas are same for all bodies?
a) – 5^oC
b) – 3^oC
c) 5^oC
d) 9^oC

Answer: c
Clarification: 2 = (37 – T)/(T + 11), => T = 5^oC.