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MDCAT Physics Chapter 5 Thermodynamics Online Test MCQs With Answers
Question # 1
In an ideal gas, the molecules have:
Choose an answer
Kinetic energy only
Potential energy only
Both KE and PE
None of these
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Question # 2
A process which is carried at constant temperature and Boyle's law can be applied is called:
Choose an answer
Adiabatic process
Isothermal process
Isochoric process
None of these
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Question # 3
In which process, the change in internal energy of the system of zero:
Choose an answer
Isochoric process
isobaric process
Adiabatic process
Isothermal process
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Question # 4
If temperature of the sink is decreased, efficiency of a carnot engine.
Choose an answer
Remains constant
Decreases
Increases
None of these
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Question # 5
The equation PVr = Constant applies to:
Choose an answer
Isothermal process
Adiabatic process
Isobaric process
None of these
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Question # 6
In thermodynamics, the change in internal energy depends upon:
Choose an answer
The path taken between initial and final states
The initial state only
The final state only
Initial and final states
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Question # 7
A process in which no heat enters or leaves the system is called.
Choose an answer
Adiabatic process
Isothermal process
Isochoric process
None of these
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Question # 8
When heat is added to the system, the entropy change is:
Choose an answer
Positive
Negative
Zero
None of these
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Question # 9
The pressure exerted on the walls on the vessel by gas molecules is defined as:
Choose an answer
Force per unit volume
Energy per unit area
mass per unit volume
None of these
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Question # 10
The efficiency of a particle heat engine:
Choose an answer
can be 100%
Cannot be 100%
Is always zero
None of these
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Question # 11
If P is the pressure and V is the volume, Then PV will represent:
Choose an answer
Power
Work
Force
None of these
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Question # 12
The relationship between Boltzmann constant K with R and N
A
is given as:
Choose an answer
k = RN
A
k = R/N
A
k = NR/N
A
None of these
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Question # 13
Real gases strictly obey gas laws at:
Choose an answer
High pressures and low temperatures
Low pressures and high temperatures
High pressures and & temperatures
None of these
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Question # 14
The number of molecules in one mole of gas is equal to:
Choose an answer
Avogadro number N
A
Gas constant R
Boltzmann constant k
None of these
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Question # 15
Avogadro number is known as number of molecules in:
Choose an answer
One kg of a substance
Unit volume of a substance
One mole of a substance
None of these
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Question # 16
If the temperature difference between hot and cold body is greater the heat engine is:
Choose an answer
Not efficient
Less efficient
More efficient
NOne of above
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Question # 17
Petrol engine coverts ____________ of available heat energy into work.
Choose an answer
20% to 25%
25% to 30%
30% to 35%
35% to 40%
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Question # 18
The efficiency of a practical heat engine:
Choose an answer
Can be 100%
Can not be 100%
Is always Zero
None of these
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Question # 19
What will be efficiency of carnot engine when it is operated between the temperatures 47
o
C and 127
o
C:
Choose an answer
Reversible
Irreversible
Sometimes A and B
None of these
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Question # 20
No of spark plugs needed in diesel engine is:
Choose an answer
Four
Five
Six
None of these
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