91. Isochoric process is one in which
(a) free expansion takes place
(b) very little mechanical work is done by the system
(c) no mechanical work is done by the system
(d) all parameters remain constant
(e) mass and energy transfer do not take place.
Ans: c
92. According to first law of thermodynamics
(a) work done by a system is equal to heat transferred by the system
(b) total internal energy of a system during a process remains constant
(c) internal energy, enthalpy and entropy during a process remain constant
(d) total energy of a system remains constant
(e) entropy of a system remains constant.
Ans: d
93. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
(a) zeroth low of thermodynamic
(b) first law of thermodynamics
(c) second law to thermodynamics
(d) basic law of thermodynamics
(e) claussius statement.
Ans: b
94. First law of thermodynamics furnishes the relationship between
(a) heat and work
(b) heat, work and properties of the system
(c) various properties of the system
(d) various thermodynamic processes
(e) heat and internal energy.
Ans: b
95. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy.
Ans: a
96. In an isothermal process, the internal energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
(e) first decreases and then increases.
Ans: c
97. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy.
Ans: c
98. According to first law of thermodynamics
(a) mass and energy are mutually convertible
(b) Carnot engine is most efficient
(c) heat and work are mutually convertible
(d) mass and light are mutually convertible
(e) heat flows from hot substance to cold substance.
Ans: c
99. Total heat of a substance is also known as
(a) internal energy
(b) entropy
(c) thermal capacity
(d) enthalpy
(e) thermal conductance.
Ans: d
100. First law of thermodynamics
(a) enables to determine change in internal energy of the system
(b) does not help to predict whether the system will or not undergo a change
(c) does not enable to determine change in entropy
(d) provides relationship between heat, work and internal energy
(e) all of the above.
Ans: e
101. Addition of heat at constant pressure to a gas results in
(a) raising its temperature
(b) raising its pressure
(c) raising its volume
(d) raising its temperature and doing external work
(e) doing external work.
Ans: d
102. Carnot cycle has maximum efficiency for
(a) reversible engine
(b) irreversible engine
(c) new engine
(d) petrol engine
(e) diesel engine.
Ans: a
103. Measurement of temperature is based on
(a) thermodynamic properties
(b) zeroth law of thermodynamics
(c) first law of thermodynamics
(d) second law of thermodynamics
(e) joule's law.
Ans: b
104. Carnot cycle efficiency depends upon
(a) properties of the medium/substance used
(b) condition of engine
(c) working condition
(d) temperature range of operation
(e) effectiveness of insulating material around the engine.
Ans: d
105. Carnot cycle efficiency is maximum when
(a) initial temperature is 0°K
(b) final temperature is 0°K
(c) difference between initial and final temperature is 0°K
(d) final temperature is 0°C
(e) initial temperature is minimum possible.
Ans: b
106. An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be
(a) 650°K
(b) 600°K
(c) 625°K
(d) 700°K
(e) 750°K.
Ans: a
107. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
(a) temperature
(b) enthalpy
(c) internal energy
(d) entropy
(e) all of the above.
Ans: d
108. If a system after undergoing a series of processes, returns to the initial state then
(a) process is thermodynamically in equilibrium
(b) process is executed in closed system cycle
(c) its entropy will change due to irreversibility
(d) sum of heat and work transfer will be zero
(e) no work will be done by the system.
Ans: d
109. Which of the following represents the perpetual motion of the first kind
(a) engine with 100% thermal efficiency
(b) a fully reversible engine
(c) transfer of heat energy from low temperature source to high tempera¬ture source
(d) a machine that continuously creates its own energy
(e) production of energy by temperature differential in sea water at different levels.
Ans:
110. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
(a) feasible
(b) impossible
(c) possible
(d) possible, but with lot of sophistication
(e) desirable.
Ans: d
(a) free expansion takes place
(b) very little mechanical work is done by the system
(c) no mechanical work is done by the system
(d) all parameters remain constant
(e) mass and energy transfer do not take place.
Ans: c
92. According to first law of thermodynamics
(a) work done by a system is equal to heat transferred by the system
(b) total internal energy of a system during a process remains constant
(c) internal energy, enthalpy and entropy during a process remain constant
(d) total energy of a system remains constant
(e) entropy of a system remains constant.
Ans: d
93. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
(a) zeroth low of thermodynamic
(b) first law of thermodynamics
(c) second law to thermodynamics
(d) basic law of thermodynamics
(e) claussius statement.
Ans: b
94. First law of thermodynamics furnishes the relationship between
(a) heat and work
(b) heat, work and properties of the system
(c) various properties of the system
(d) various thermodynamic processes
(e) heat and internal energy.
Ans: b
95. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy.
Ans: a
96. In an isothermal process, the internal energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
(e) first decreases and then increases.
Ans: c
97. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy.
Ans: c
98. According to first law of thermodynamics
(a) mass and energy are mutually convertible
(b) Carnot engine is most efficient
(c) heat and work are mutually convertible
(d) mass and light are mutually convertible
(e) heat flows from hot substance to cold substance.
Ans: c
99. Total heat of a substance is also known as
(a) internal energy
(b) entropy
(c) thermal capacity
(d) enthalpy
(e) thermal conductance.
Ans: d
100. First law of thermodynamics
(a) enables to determine change in internal energy of the system
(b) does not help to predict whether the system will or not undergo a change
(c) does not enable to determine change in entropy
(d) provides relationship between heat, work and internal energy
(e) all of the above.
Ans: e
101. Addition of heat at constant pressure to a gas results in
(a) raising its temperature
(b) raising its pressure
(c) raising its volume
(d) raising its temperature and doing external work
(e) doing external work.
Ans: d
102. Carnot cycle has maximum efficiency for
(a) reversible engine
(b) irreversible engine
(c) new engine
(d) petrol engine
(e) diesel engine.
Ans: a
103. Measurement of temperature is based on
(a) thermodynamic properties
(b) zeroth law of thermodynamics
(c) first law of thermodynamics
(d) second law of thermodynamics
(e) joule's law.
Ans: b
104. Carnot cycle efficiency depends upon
(a) properties of the medium/substance used
(b) condition of engine
(c) working condition
(d) temperature range of operation
(e) effectiveness of insulating material around the engine.
Ans: d
105. Carnot cycle efficiency is maximum when
(a) initial temperature is 0°K
(b) final temperature is 0°K
(c) difference between initial and final temperature is 0°K
(d) final temperature is 0°C
(e) initial temperature is minimum possible.
Ans: b
106. An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be
(a) 650°K
(b) 600°K
(c) 625°K
(d) 700°K
(e) 750°K.
Ans: a
107. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
(a) temperature
(b) enthalpy
(c) internal energy
(d) entropy
(e) all of the above.
Ans: d
108. If a system after undergoing a series of processes, returns to the initial state then
(a) process is thermodynamically in equilibrium
(b) process is executed in closed system cycle
(c) its entropy will change due to irreversibility
(d) sum of heat and work transfer will be zero
(e) no work will be done by the system.
Ans: d
109. Which of the following represents the perpetual motion of the first kind
(a) engine with 100% thermal efficiency
(b) a fully reversible engine
(c) transfer of heat energy from low temperature source to high tempera¬ture source
(d) a machine that continuously creates its own energy
(e) production of energy by temperature differential in sea water at different levels.
Ans:
110. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
(a) feasible
(b) impossible
(c) possible
(d) possible, but with lot of sophistication
(e) desirable.
Ans: d
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