thermodynamics MCQs – Page 5

Practise focused thermodynamics questions with marked answers for exam preparation and subject revision.

thermodynamics Mcqs

81. According to Daltons law, the total pres sure of the mixture of gases is equal to________________?
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A. greater of the partial pressures of all

B. atmospheric pressure

C. average of the partial pressures of all

D. sum of the partial pressures of all

E. sum of the partial pressures of all divided by average molecular weight

82. Which law states that the internal energy of a gas is a function of temperature__________________?
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A. there is no such law

B. Regnaults law

C. Joules law

D. Charles law

E. Boyles law

83. Mixture of ice and water form a________________________?
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A. open system

B. isolated system

C. closed system

D. heterogeneous system

E. thermodynamic system.

84. Carnot cycle efficiency depends upon________________?
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A. effectiveness of insulating material around the engine

B. condition of engine

C. working condition

D. properties of the medium/substance used

E. temperature range of operation

85. Which of the following processes is irreversible process___________________?
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A. isothermal

B. none of the above

C. adiabatic

D. throttling

E. all of the above

86. Measurement of temperature is based on_________________?
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A. joules law

B. thermodynamic properties

C. second law of thermodynamics

D. zeroth law of thermodynamics

E. first law of thermodynamics

87. In a Carnot cycle, heat is transferred at_______________________?
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A. constant temperature

B. constant enthaply

C. constant volume

D. constant pressure

E. any one of the above

88. A closed system is one in which_________________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. mass crosses the boundary but not the energy

C. neither mass nor energy crosses the boundaries of the system

D. both energy and mass cross the boundaries of the system

E. thermodynamic reactions take place

89. A sudden fall in the barometer reading is a sign of approaching________________?
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A. cold wave

B. fine weather

C. storm

D. rains

E. hot wave

90. Addition of heat at constant pressure to a gas results in________________?
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A. doing external work

B. raising its temperature

C. raising its temperature and doing external work

D. raising its volume

E. raising its pressure

91. An ideal gas as compared to a real gas at very high pressure occupies_________________?
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A. same volume

B. no such correlation

C. more volume

D. unpredictable behaviour

E. less volume

92. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to__________________?
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A. ve

B. #NAME?

C. zero

D. pressure x volume

E. any where between zero and infinity

93. An adiabatic wall is one which__________________?
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A. discourages thermal interaction

B. prevents thermal interaction

C. permits thermal interaction

D. dos not exist.

E. encourages thermal interaction

94. A heat exchange process in which the product of pressure and volume remains constant is known as_______________?
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A. throttling process

B. isentropic process

C. hyperbolic process

D. heat exchange process

E. adiabatic process

95. The basis for measuring thermodynamic property of temperature is given by___________________?
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A. third law of thermodynamics

B. first law of thermodynamics

C. zeroth law of thermodynamics

D. second law of thermodynamics

E. Avogadros hypothesis

96. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to________________?
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A. 1/Vr

B. J2

C. T

D. j

E. Vr

97. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?
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A. parabolic expansion

B. throttling

C. free expansion

D. adiabatic expansion

E. hyperbolic expansion

98. Atmospheric pressure is equal to____________?
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A. 1.013 bar

B. All of these

C. 101.3KN/m2

D. 760mm of Hg

99. An open system is one in which____________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. neither mass nor energy crosses the boundaries of the system

C. both energy and mass cross the boundaries of the system

D. mass crosses the boundary but not the energy

E. thermodynamic reactions do not occur

100. For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?
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A. any gas

B. perfect gas

C. saturated steam

D. superheated steam

E. water

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