21- The process in which a working substance neither receives nor gives out heat to its surroundings during its expansion or contraction is known as
(A) Isothermal process
(B) Isentropic process
(C) Polytropic process
(D) Adiabatic process
22- An equal volume of all gases, at the same temperature and pressure, contains an equal number of molecules. This is according to
(A) Charles’ law
(B) Avagadro’s law
(C) Joule’s law
(D) Gay-Lussac’s law
23- The measurement of thermodynamic property known as temperature, is based upon
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Measurement and not on thermodynamics laws
24- The temperature at which the volume of a gas becomes zero is called
(A) Absolute zero temperature
(B) Absolute temperature
(C) Zero volume temperature
(D) None of the above
25- Heat and work are
(A) Intensive properties
(B) Extensive properties
(C) Point function
(D) Path function
26- Change in internal energy in a reversible process occurs in a closed system is equal to the heat transferred, if the process occurs at a constant
(A) pressure
(B) volume
(C) temperature
(D) enthalpy
27- Constant pressure lines in the superheated region of the Mollier diagram will have
(A) A Positive slope
(B) A negative slope
(C) Zero slope
(D) Both positive and negative slope
28- An air-standard diesel cycle consists of
(A) Two adiabatic and two constant volume processes
(B) Two constant volume and two isothermal processes
(C) One constant pressure, one constant volume, and two adiabatic processes
(D) One constant pressure, one constant volume, and two isothermal processes
ANSWERS
21-(D), 22-(B), 23-(A), 24-(A), 25-(D), 26-(B), 27-(A), 28-(C)