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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers
Question # 1
The temperature of a certain substance in Celsius scale of temperature is 800
o
C in Kelvin scale it is.
Choose an answer
173 K
931 K
1073 K
1193 K
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Question # 2
Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0
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Isobaric process
Isochoric process
Isothermal process
Adiabatic process
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Question # 3
When the temperature of source and sink of a heat engine become equal the entropy change will be.
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Zero
Maximum
Minimum
Negative
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Question # 4
If volume of the gas doubled without changing its temperature the pressure of the gas is
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Reduced to half of original value
Not changed
Reduced to one fourth of original value
Doubled
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Question # 5
A heat engine with 100% efficiency would have to.
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Do no work
Be at uniform temperature
Use no heat
Discharge of 0
o
C
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Question # 6
When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.
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An increase in pressure
An increase in temperature
A change in phase
A change in entropy
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Question # 7
Contrivances for converting heat into work are called.
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Heat pumps
Heat engines
IC engines
Jet engine
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Question # 8
Thermodynamics deals with
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Isolated systems
The interactions among various parts of the system
The microscopic behavior of a system
The interactions between system and surrounding
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Question # 9
According to kinetic energy of gases one assumes that the collisions between the molecules are.
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Perfectly elastic
Perfectly inelastic
Partly elastic
Partly inelastic
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Question # 10
At the temperature of -273
o
C. pressure of a gas at constant volume becomes zero This specific temperature is called.
Choose an answer
Freezing point
Critical temperature
Absolute zero
Terminal point
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Question # 11
Most cooking involves
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Adiabatic process
Isothermal process
Isobaric process
Isochoric process
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Question # 12
A diatomic gas contains only
Choose an answer
Translational K.E.
Rotational K.E.
Vibrational K.E.
All of these
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Question # 13
Absolute zero may be regarded as the temperature of which
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Water freezes
All substances are solids
All gases become liquids
Molecular motioning a gas would ceases
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Question # 14
Which of the following is an example of an irreversible process.
Choose an answer
Isothermal and adiabatic process
Melting of ice
Work done against friction
Pettier effect
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Question # 15
Temperature of a gas is related to.
Choose an answer
Total K.E. of the gas molecules
The K.E. of the centre of mass of the gas
The P.E. of the centre of mass of the gas
Total K.E. of the molecules w.r.t the centre of mass of gas
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Question # 16
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 # 17
Mean free path in a gas is the
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Distance travelled by a molecule before hitting a wall
Average distance travelled by a molecule in one second
Average distance travelled between molecules between any two successive collisions
Root mean square velocity
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Question # 18
The internal energy of monoatomic gas is.
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3/2 RT
Independent of temperature
In the form of K.E.
Partially kinetic and partially potential
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Question # 19
Which of the following is a clinical thermometer.
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Gas thermometer
Mercury thermometer
Alcohol thermometer
Radiation thermometer
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Question # 20
How does heat transfer between objects.
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From cold to hot objects
From hot to cold objects
By electromagnetic radiations
From hotter to hottest objects.
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Question # 21
The gas temperature is increased from 27
o
C to 127
o
C What is the ratio of mean kinetic energies.
Choose an answer
3/4
4/3
9/10
10/9
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