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

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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

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

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

Explanation: For the given process ∆U = W – Q.

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

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

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

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

Explanation: 10 = 1(U – 10).

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

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

Explanation: Specific internal energy is internal energy per unit mass of the system.

10. For an isolated system, internal energy
a) Can change
b) Can`t Change
c) May change
d) None of the mentioned

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

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
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