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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers
Question # 1
An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
Choose an answer
decrease
remains the same
increase
any one of them
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Question # 2
The pressure exerted by the gas is
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directly proportional to the P.E
inversely proportional to the P.E
inversely proportional to the K.E
directly proportional to the K.E
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Question # 3
Which of the following is not thermo dynamical function?
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Enthalpy
Work done
Gibb's energy
Internal energy
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Question # 4
The rate of change of momentum of a molecule is equal to:
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Pressure
Work
Density
Force
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Question # 5
If a liquid is heated in weightlessness, the heat is transmitted through
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Conduction
Convection
Radiation
Neither, because the liquid cannot be heated in weightlessness
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Question # 6
A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
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1/2
More than 1/2
Less than 1/2
Between 1 and 2
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Question # 7
Average KE of a gas molecule has:
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Direct relation with absolute temperature and inverse relation with pressure
Direction relation with both absolute temperature and pressure
Inverse relation with both absolute temperature and pressure
None of these
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Question # 8
According to the second law, which is must to produce work
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a source contains a large amount of heat energy
two sources at the same temperature
two sources at the different temperatures
a source contains a small amount of energy
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Question # 9
When two objects are rubbed together, their internal energy
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remains same
decreases
remains the same then decreases
increases
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Question # 10
One kilogram of different substances contain
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same number of molecules
different number of molecules
may be same or different
none of them
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Question # 11
A carnot cycle consists of
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One step
two step
three steps
four steps
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Question # 12
At O
° K which of the following properties of a gas will be zero?
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Kinetic energy
Potential energy
Vibrational energy
Density
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Question # 13
First law of thermodynamics is consequence of conservation of
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Work
Energy
Heat
All of these
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Question # 14
At what temperature the adiabatic change is equivalent to the isothermal change?
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Zero degree Celsius
Zero Kelvin
Critical temperature
Above critical temperature
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Question # 15
For making cooking utensils, which of the following pairs of properties is most suited?
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Low specific heat and high conductivity
Low specific heat and low conductivity
High specific heat and high conductivity
High specific heat and low conductivity
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Question # 16
When heat is added into the system then change in entropy is
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negative
positive
zero
any one of them
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Question # 17
Boyle's law is applicable in
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Isochoric process
Isothermal process
Isobaric process
Isotonic process
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Question # 18
On colliding in a closed container, the gas molecules
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Transfer momentum to the walls
Momentum becomes zero
Move in opposite directions
Perform Brownian motion
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Question # 19
If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I
3
gives the:
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Force
Density
Work done
Pressure
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