Chemical Process Calculation Questions and Answers – Energy balance for Different type of systems – I

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Energy balance for Different type of systems – I”.

1. 20 J of heat is supplied to the system and work done on the system is 15 J. What is the change in internal energy of the system?
a) 15 J
b) 20 J
c) 25 J
d) 35 J
View Answer

Answer: d
Explanation: For the given process ∆U = – (-W) +Q.

2. 25 J of heat is supplied to a system and work done by the system is 15 J. What is the change in internal energy of the system?
a) 10 J
b) 20 J
c) 25 J
d) 35 J
View Answer

Answer: a
Explanation: For the given process ∆U = -W +Q.

3. If work done on a system is 20 J and a heat of 15 J is taken out, what is the change in internal energy of the system?
a) 5 J
b) 10 J
c) 20 J
d) 30 J
View Answer

Answer: a
Explanation: For the given process ∆U = W – Q.
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4. 25 J of heat is supplied to a system and work done by the system is 10 J. What is the change in internal energy of the system?
a) 10 J
b) 15 J
c) 25 J
d) 35 J
View Answer

Answer: b
Explanation: For the given process ∆U = -W +Q.

5. 20 J of heat is supplied to a system and change in internal energy of the system is 10 J. If 2 J of heat is taken out then how much was work done on the system?
a) -2 J
b) -4 J
c) -6 J
d) -8 J
View Answer

Answer: d
Explanation: For the given process ∆U = W +Q.

6. A system does a work of 15 J and the change in internal energy of the system is 10 J, what is the heat supplied to the system?
a) – 15 J
b) 15 J
c) – 25 J
d) 25 J
View Answer

Answer: d
Explanation: 10 = – 15 + Q.

7. 1 Kg of steam that contains an internal energy of 10 J/Kg, if 10 J of heat is supplied to the system, what is the resultant internal energy of the system?
a) 10 J/ Kg
b) 20 J/Kg
c) 30 J/Kg
d) 40 J/Kg
View Answer

Answer: b
Explanation: 10 = 1(U – 10).
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8. 2 Kg of steam that contains an internal energy of 20 J/Kg, if 50 J of heat is supplied to the system, what is the resultant internal energy of the system?
a) 45 J/Kg
b) 40 J/Kg
c) 35 J/Kg
d) 20 J/Kg
View Answer

Answer: a
Explanation: 50 = 2(U – 20).

9. Specific internal energy is internal energy per unit ________ of the system.
a) Mass
b) Mole
c) Volume
d) None of the mentioned
View Answer

Answer: a
Explanation: Specific internal energy is internal energy per unit mass of the system.
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10. For an isolated system, internal energy
a) Can change
b) Can`t Change
c) May change
d) None of the mentioned
View Answer

Answer: b
Explanation: The walls does not allow to pass neither mass nor energy.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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