Thermodynamics Quiz | Thermodynamics Objective Type Questions and Answers

Questions
21 According to kinetic theory of gases, the absolute zero temperature is attained when
A volume of the gas is zero
B pressure of the gas is zero
C kinetic energy of the molecules is zero
D specific heat of gas is zero

Answer: kinetic energy of the molecules is zero
22 Superheated vapour behaves
A exactly as gas
B as steam
C as ordinary vapour
D approximately as a gas

Answer: approximately as a gas

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23 Absolute zero pressure will occur
A at sea level
B at the center of the earth
C when molecular momentum of the system becomes zero
D under vacuum conditions

Answer: when molecular momentum of the system becomes zero
24 The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
A a temperature of – 273.16°C
B a temperature of 0°C
C a temperature of 273 °K
D a negative pressure and 0°C temperature

Answer: a temperature of – 273.16°C
25 Intensive property of a system is one whose value
A depends on the mass of the system, like volume
B does not depend on the mass of the system, like temperature, pressure, etc.
C is not dependent on the path followed but on the state
D is dependent on the path followed and not on the state

Answer: does not depend on the mass of the system, like temperature, pressure, etc.
26 Temperature of a gas is produced due to
A its heating value
B kinetic energy of molecules
C repulsion of molecules
D attraction of molecules

Answer: kinetic energy of molecules
27 Kinetic theory of gases assumes that the collisions between the molecules are
A perfectly elastic
B perfectly inelastic
C partly elastic
D partly inelastic

Answer: perfectly elastic
28 An ideal gas as compared to a real gas at very high pressure occupies
A more volume
B less volume
C same volume
D unpredictable behaviour

Answer: more volume
29 The unit of temperature in S.I. units is
A Centigrade
B Celsius
C Fahrenheit
D Kelvin

Answer: Kelvin
30 The unit of mass in S.I. units is
A kilogram
B gram
C tonne
D quintal

Answer: kilogram
31 Carnot cycle is
A a reversible cycle (ft) an irreversible cycle
B a semi-reversible cycle
C a quasi static cycle
D an adiabatic irreversible cycle

Answer: a reversible cycle (ft) an irreversible cycle
32 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

Answer: sum of heat and work transfer will be zero
33 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

Answer: final temperature is 0°K
34 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

Answer: entropy
35 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 sophistications

Answer: possible, but with lot of sophistications
36 In a Carnot cycle, heat is transferred at
A constant pressure
B constant volume
C constant temperature
D constant enthaply

Answer: constant temperature
37 A diathermic wall is one which
A prevents thermal interaction
B permits thermal interaction
C encourages thermal interaction
D discourages thermal interaction

Answer: permits thermal interaction
38 An adiabatic wall is one which
A prevents thermal interaction
B permits thermal interaction
C encourages thermal interaction
D discourages thermal interaction

Answer: prevents thermal interaction
39 The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
A The room will be cooled to the temperature inside the refrigerator
B The room will be cooled very slightly
C The room will be gradually warmed up
D The temperature of the air in room will remain unaffected

Answer: The room will be gradually warmed up
40 Water contained in a beaker can be made to boil by passing steam through it
A at atmospheric pressure
B at a pressure below the firuosphejric pressure
C at a pressure greater than atmospheric pressure
D any pressure

Answer: at a pressure greater than atmospheric pressure
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