Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Internal Energy”.
1. _________ represents a microscopic account of all the molecular, atomic, and subatomic energies.
a) Potential energy
b) Kinetic energy
c) Internal energy
d) None of the mentioned
Answer: c
Clarification: Internal energy represents a microscopic account of all the molecular, atomic, and subatomic energies.
2. Specific internal energy is a path variable. The statement is
a) True
b) False
c) Always true
d) None of the mentioned
Answer: b
Clarification: Specific internal energy is a state variable.
3. Specific internal energy _________ stored.
a) can be
b) can not be
c) may be
d) may not be
Answer:
Clarification: Specific internal energy can be stored.
4. Internal energy is the function of
a) Temperature and Pressure
b) Temperature and Volume
c) Pressure and Volume
d) None of the mentioned
Answer: b
Clarification: U = f(T,V).
5. Cv is the change in internal energy at constant _______________
a) Pressure
b) Temperature
c) Volume
d) None of the mentioned
Answer: c
Clarification: Cv is the change in internal energy at constant Volume.
6. Absolute values of internal energies ________ calculated.
a) can be
b) can not be
c) may be
d) may not be
Answer: a
Clarification: Internal energies can be calculated relative to a reference state.
7. What is the change in internal energy when 10 kg mol of Oxygen is heated from 200 K to 400 K at constant volume (Cv = 4000 J/(Degree Celsius)(Kg.mole))?
a) 2 MJ
b) 4 MJ
c) 6 MJ
d) 8 MJ
Answer: d
Clarification: U2 – U1 = n*Cv*(T2-T1).
8. Which one is true for internal energy?
a) It is sum of all forms of energies associated with molecules of a system
b) It is a state function of a system
c) It is proportional to transnational K.E of the molecules
d) All of the mentioned
Answer: d
Clarification: All are correct for internal energy and are part of its property.
9. Internal energy is a
a) Path variable
b) State variable
c) Neither path nor a state variable
d) None of the mentioned
Answer: b
Clarification: Internal energy does not depend on path.
10. A mass of 20 Kg mol is cooled from 200 K to 100 K and the change in internal energy is 400 KJ. What is the heat capacity at constant volume?
a) 100 J/(Degree Celsius)(Kg mole)
b) 200 J/(Degree Celsius)(Kg mole)
c) 300 J/(Degree Celsius)(Kg mole)
d) 400 J/(Degree Celsius)(Kg mole)
Answer: b
Clarification: U2 – U1 = n*Cv*(T2-T1).