# MCQ FIRST LAW OF THERMODYNAMICS

MCQ FIRST LAW OF THERMODYNAMICS

1. Total energy of the universe is
• (a) Increasing
• (b) Decreasing
• (c) Increasing as well as decreasing
• (d) None

Ans: (d)

1. As per First Law of Thermodynamics, energy can be
• (a) Created
• (b) Destroyed
• (c) Created as well as destroyed
• (d) None

Ans:(d)

1. As per First Law of Thermodynamics, energy cannot be
• (a) Created
• (b) Destroyed
• (c) Created as well as destroyed
• (d) None

Ans:(c)

1. Total energy of the universe is

(a) Increasing

(b) Decreasing

(c) Constant

(d) None

Ans: (c)

1. An intensive property is
• (a) Independent of volume
• (b) Independent of density
• (c) Independent of mass
• (d) None

1. Which of the following is an intensive property?
• (a) Volume
• (b) Enthalpy
• (c) Entropy
• (d) None

Ans: (d)

1. Which of the following is an intensive property?
• (a) Volume
• (b) Enthalpy
• (c) Temperature
• (d) None

Ans: (c)

1. Which of the following is NOT an intensive property?
• (a) Volume
• (b) Pressure
• (c) Temperature
• (d)None

Ans: (a)

1. Heat supplied to a system is
• (a) Work done –Change in internal energy
• (b) Work done +Change in internal energy
• (c) Work done Change in internal energy
• (d) None

Ans : (b)

1. Conversion of heat energy into mechanical work is
• (a) 100 %
• (b) 80%
• (c) 50%
• (d) None

Ans: (d)

1. Conversion of heat energy into mechanical work is
• (a) >100 %
• (b) <100%
• (c) =100%
• (d) None

Ans: (b)s

1. The temperature of a system is
• (a) Extensive property
• (b) Intensive property
• (c) Extensive as well as intensive property
• (d) None

Ans: (b)

1. Force is an
• (a) Extensive property
• (b) Intensive property
• (c) Extensive as well as intensive property
• (d) None

Ans: (a)

1. First law of thermodynamics is a law of
• (a) Conservation of enthalpy
•  (b)Conservation of entropy
• (c) Conservation of internal energy
• (d) None

Ans: (d)

1. First law of thermodynamics is a law of
• (a) Conservation of enthalpy
• (b) Conservation of entropy
• (c) Conservation of energy
• (d) None

Ans: ( c)

1. Which Property is related to the First Law of Thermodynamics?

(a)Enthalpy

(b) Entropy

(d)None

Ans: ( c )

1. An open system has
• (a) Only Mass transfer
• (b) Only Energy transfer
• (c) Mass as well as energy transfer
• (d) None

Ans: (c )

1. An closed system has
• (a) Only Mass transfer
• (b) Only Energy transfer
• (c) Mass as well as energy transfer
• (d) None

Ans: (a )

1. An isolated system has
• (a) Only Mass transfer
• (b) Only Energy transfer
•  (c)Mass as well as energy transfer
• (d) None

Ans: (d )

1. An isolated system has
• (a) No Mass transfer
• (b) No Energy transfer
• (c) No Mass and no energy transfer
• (d) None

Ans: (c )

1. Among the system, boundary and surrounding, the order is
• (a) System, surrounding and boundary
• (b) Surrounding, system and boundary
• (c) System, boundary and surrounding
• (d) None

Ans: (c )

1. A system consists of
• (a) System, boundary and surrounding
• (b) Pressure, temperature and volume
• (c) Intensive, extensive and internal energy
• (d) None

Ans: (a)

1. In a thermodynamic process, which one is NOT a path function?
• (a) Work done
• (b) Heat supplied
• (c) Internal energy
• (d) None

Ans: (c )

1. In a thermodynamic process, which one is a path function?
• (a) Work done
• (b) Enthalpy
• (c) Internal energy
• (d) None

Ans: (a )

1. First law of Thermodynamics deals with the Law of
• (a) Conservation of momentum
• (b) Conservation of mass
• (c) Conservation of internal energy
• (d) None

Ans : (d)

1. Increase in enthalpy causes
• (a) Increase in volume
• (b) Increase in pressure
• (c) Increase in mass
• (d) None

Ans: (d)

1. During an exothermic reaction, There is
• (a) Increase in enthalpy
• (b) Decrease in enthalpy
• (c) Remains constant
• (d) None

Ans : (b)

1. During an exothermic reaction, There is
• (a) Increase in mass
• (b) Decrease in mass
• (c) Mass remains constant
• (d) None

Ans : (b)

1.  Unit of enthalpy is
• (a) kJ/kg K
• (b) kJ/m3+
• (c) kJ/kg
• (d) None

Ans: (c )

1. I. unit of temperature is
• (a) 0C
• (b) 0K
• (c) 0F
• (d) None

Ans: (d)

1. I. unit of temperature is
• (a) C
• (b) K
• (c) F
• (d) None

Ans: (b)

1. I. unit of mass is
• (a) g
• (b) kg
• (c) lb
• (d) None

Ans: (b)

1. I. unit of pressure is
• (a) Pascal
• (b) mm of Hg
• (c) bar
• (d) None

Ans: (c)

1. Example of a open thermodynamic system is
• (a) Refrigerator
• (b) Air conditioner
• (c) Compressor in a refrigerator
• (d) None

Ans: ( c)

1. Example of a closed thermodynamic system is
• (a) Evaporator in a Refrigerator
• (b) Condenser in an Air conditioner
• (c) Compressor in a refrigerator
• (d) None

Ans: ( d)

1. Which is the thermodynamic system in a human body ?
• (a) Open system
• (b) Closed system
• (c) Isolated system
• (d) None

Ans: (a)

1. The S.I. unit of power is

(a) Newton

(b) Pascal

(c) Joule

(d) None

Ans: (d)

1. Which of the following is NOT a point function?
• (a) Temperature
• (b) Entropy
• (c) Pressure
• (d) None
• Ans: (d)
1. . Which of the following is NOT a point function?
• (a) Temperature
• (b) Entropy
• (c) Heat
• (d) None

Ans: (c)

1. Temperature remains constant in
• (a) Dalton’s Law
• (b) Charles Law
• (c) Raoult’s Law
• (d) None

Ans: (d)

1. Temperature remains constant in
• (a) Dalton’s Law
• (b) Charles Law
• (c) Boyle’s Law
• (d) None

Ans: (c)