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Free download in PDF Thermodynamics Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(29)
The unit of temperature in S.I. units is
[A]
Centigrade
[B]
Celsius
[C]
Fahrenheit
[D]
Kelvin
(30)
The unit of mass in S.I. units is
[A]
kilogram
[B]
gram
[C]
tonne
[D]
quintal
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
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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