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MDCAT Physics Chapter 5 Thermodynamics Online Test MCQs With Answers
Question # 1
For a gas obeying Boyle's law, if the pressure is doubled the volume becomes:
Choose an answer
One half
Double
Four times
None of these
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Question # 2
The rate of change of momentum of a molecule is equal to:
Choose an answer
Pressure
Work
Density
Force
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Question # 3
Absolute zero is considered as that temperature at which:
Choose an answer
All liquids become gases
All gases become liquids
Water freezes
None of these
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Question # 4
Thermal radiations are a type of:
Choose an answer
Mechanical waves
Electromagnetic waves
Alpha rays
Electrons
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Question # 5
Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.
Choose an answer
Four , Six
One , four
two , five
None of these
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Question # 6
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 # 7
Number of spark plugs needed in diesel engine is:
Choose an answer
Four
Five
Six
None of these
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Question # 8
No entropy change is associated with:
Choose an answer
Isothermal
Adiabatic process
Isobaric process
None of them
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Question # 9
A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:
Choose an answer
20%
80%
50%
None of these
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Question # 10
When two objects come to common temperature, the body is said to be in:
Choose an answer
Static equilibrium
Dynamic equilibrium
Thermal equilibrium
None of these
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Question # 11
Only those processes are probable to take place for which entropy os the system:
Choose an answer
Increases
Remains constant
Both A and B are correct
None of above
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Question # 12
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 # 13
The equation W = ________𝜟U represents:
Choose an answer
Thermal process
adiabatic process
Isobaric process
None of these
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Question # 14
Electromagnetic waves emitted by hot bodies are called:
Choose an answer
Photoelectrons
Alpha rats
Thermal radiation
None of these
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Question # 15
Diesel 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 # 16
The equation PVr = Constant applies to:
Choose an answer
Isothermal process
Adiabatic process
Isobaric process
None of these
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Question # 17
In the theory of dimensional analysis, heat may be properly represented by:
Choose an answer
ML
2
T
-2
MT
-2
ML
-1
T
-1
None of these
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Question # 18
At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:
Choose an answer
Double
Remains constant
Half
None of these
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Question # 19
If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
Choose an answer
-2 mv
Zero
2 mv
mv
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Question # 20
At constant temperature, if the density of the gas is increased, its pressure will:
Choose an answer
Decrease
Increase
Remain unchanged
None of these
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Question # 21
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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