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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers
Question # 1
The pressure necessary to liquify a gas at the critical temperature is called.
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Normal pressure
Atmospheric pressure
Critical pressure
Liquid pressure
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Question # 2
For which process is the relation Delta Q = Delta V true.
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Isothermal
Adiabatic
isobaric
Isochoric
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Question # 3
Diffusion of gases occurs because the molecules of the
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Gas present in a higher concentration exerts a high pressure
Gases are different
Gasses attract each other
Gasses over about randomly
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Question # 4
Which of the following is a thermodynamic potential
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Internal energy
Enthalpy
Gibb's free energy
All of these
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Question # 5
Which law states that two given samples of an ideal gas at the same temperature pressure and volume contain the same number of molecules.
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Charles law
Avogadro's
Boyles law
Boizmann law
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Question # 6
A gas thermometer is more sensitive than a mercury thermometer because the expansion of gas for 1 o/c rise in temperature is.
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Five times as much as mercury
Ten times as much as mercury
Twenty times as much as mercury
Hundred times as much as mercury
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Question # 7
Which of the following devoices are used for measuring temperature.
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Thermocouples
Thermistors
Thermometers
All of these
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Question # 8
The practical efficiency of a heat engine is
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25% to 30.5 %
35% to 45%
30% to 45%
15% to 25%
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Question # 9
In four stroke cycle the crank makes
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One complete revolution
Two complete revolutions
three complete revolutions
Four complete reveolutions
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Question # 10
In which thermodynamic process enthalpy of the system remains constant.
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Isenthalpic process
Isolated process
Isobaric process
Isochoric process
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Question # 11
Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.
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Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
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Question # 12
What is the average K.E. of gas molecules at temperature equal to K.
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kt/3
3/2 KT
1/2 KT
2/3 KT
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Question # 13
Mean free path of gas molecules in inversely proportional to its.
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Weight
Temperature
Pressure
Volume
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Question # 14
By definition a gas is said to be have undergone adiabatic compressing when
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No heat exchange occurs between the gas and its surroundings
The gas is compressed quickly
The gas is compressed slowly
The temperature of the gas remains constant
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Question # 15
Law of increase of entropy is a result of
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First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
Zeroth law of thermodynamics
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Question # 16
If T1 and T2 are source and sink temperature respectively Carnot efficiency is.
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T1+T2/T1
T1-T2/T1
T1+T2/T2
T1-T2/T2
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Question # 17
What is the amount of mechanical work done to melt 1 g of ic completely
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4.2 J
42 J
80 J
336 J
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Question # 18
The zero point of Kelvin scale is called.
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Critical point
Terminal point
Absolute zero
Mid point
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Question # 19
Which of the following is a non contacting device that intercepts and measures thermal radiation.
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Thermometer
Pyrometer
Voltmeter
Lactometer
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Question # 20
The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.
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It remains the same
It increases by a factor of 2
It increases by a factor of 4
It increases by a factor of 8
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Question # 21
Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other.
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Third law of thermodynamics
Second law of thermodynamics
First law of thermodynamics
Zeroth law of thermodynamics
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