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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers
Question # 1
On which temperature scale a degree is 1/180 of the interval between the freezing point and the boiling point.
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Celsius scale
Fahrenheit scales
Rankine scale
Kelvin scale
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Question # 2
The process is which volume of the system remains constant.
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Isobaric process
Isochoric process
Isothermal process
Adiatatic process
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Question # 3
The number of molecules or atoms in a specific volume of a gas is independent of their
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Volume
Pressure
Size
Temperature
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Question # 4
If two gases have same reduced pressure volume and temperature it is according to
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Boyle's law
Charles law
Law of corresponding state
Zeroth law
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Question # 5
The change in entropy for any reversible cycle is identically
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Infinite
Positive
Negative
Zero
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Question # 6
In an isobaric process there is no.
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Pressure change
Internal energy change
Heat exchanged
volume change or work done
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Question # 7
A Carnot engine has the same efficiency between (i) 100 K and 500 K and ii) T and 900 K What will be T.
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90 K
100 K
180 K
200 K
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Question # 8
When the temperature of a body is equal to that of the surrounding then the body appears
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Dull black
Red hot
In thermal equilibrium
To be cold
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Question # 9
Two stem engine A and B have their sources at 900 K and 600 K and their sinks are at 450 K and 300 K respectively.
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They are equally efficient
A is less efficient than B
a is more efficient than B
Their efficiencies cannot be determined
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Question # 10
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 # 11
Which quantity must be the same for two bodies if they are to be in thermal equilibrium.
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Internal energy
P.E
Temperature
Mass
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Question # 12
The mechanical equivalent of heat
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Has the same dimension as heat
Has the same dimension as work
Has the same dimensions as energy
Is dimensionless
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Question # 13
Identify the irreversible process
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Explosion of a bomb
Slow expansion of a gas
Slow compression of a gas
Slow compression of an eleastic spring
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Question # 14
During solid ficain the temperature.
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Remains constant at the freezing point
Increases at the freezing point
Decreases at the freezing point
Decreases at the melting point
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Question # 15
Difference between Cp and Cv is equal to
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General gas constant
Planck's conatant
Molar gas constant
Boltzmann's constant
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Question # 16
What happens to Carnot efficiency if the source temperature increases.
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Decreases
Increases
Remain the same
Becomes zero
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Question # 17
The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.
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The efficiency of the working substance of the engine
the ideal gas scale of temperature
The ratio of the absolute temperature of the reservoirs
The thermal capacity of the working substance
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Question # 18
In the gas equation PV =nRT , V is the volume of.
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1 g of gas
1 L of gas
1 mol of gas
1 kg of gas
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Question # 19
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 # 20
When a hot liquid is mixed with a cold liquid temperature of the mixture.
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First decreases and then becomes constant
First increases and then becomes constant
Continuously decreaes
Is undefined for some time and then nearly becomes constant
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Question # 21
If the temperature of the source and sink are increased by same amount the efficiency of the engine.
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Increases
Decreases
Remains unchanged
May increases of decrease
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