Chemical Process Calculation Mcqs

Q:

For a steady state system, 10 J of heat is supplied to the system, what is the work done by the system?

A) 10 J B) 20 J
C) 30 J D) 40 J
 
Answer & Explanation Answer: A) 10 J

Explanation: Change in the internal energy for a steady-state system is always zero so Q = W.

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Q:

Change in the internal energy for a steady-state system is always ___________

A) Positive B) Negative
C) Zero D) None of the mentioned
 
Answer & Explanation Answer: C) Zero

Explanation: Change in the internal energy for a steady-state system is always zero.

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31
Q:

For an isolated system, internal energy

A) Can change B) Can`t Change
C) May change D) None of the mentioned
 
Answer & Explanation Answer: B) Can`t Change

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

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32
Q:

Specific internal energy is internal energy per unit ________ of the system.

A) Mass B) Mole
C) Volume D) None of the mentioned
 
Answer & Explanation Answer: A) Mass

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

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40
Q:

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
 
Answer & Explanation Answer: A) 45 J/Kg

Explanation: 50 = 2(U – 20).

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38
Q:

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
 
Answer & Explanation Answer: B) 20 J/Kg

Explanation: 10 = 1(U – 10).

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37
Q:

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
 
Answer & Explanation Answer: D) 25 J

Explanation: 10 = – 15 + Q.

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55
Q:

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
 
Answer & Explanation Answer: D) -8 J

Explanation: For the given process ?U = W +Q.

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