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Online Tests
Physics Fsc Part 1 Chapter 11 Online Test MCQs With Answers
Question # 1
A Carnot engine has an efficiency of 50% when its sink temperature is at 27
o
C. The temperature of source.
Choose an answer
273
o
C
300
o
C
327
o
C
373
o
C
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Question # 2
For a diatomic gas Cv= 5R/2 then gamma for this gas is.
Choose an answer
5/7
4/35
7/5
35/4
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Question # 3
For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.
Choose an answer
Double
Three fold
One half
Remains the same
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Question # 4
The efficiency of diesel engine is about
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25 % to 30%
35% to 40%
40% to 50%
50% to 60%
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Question # 5
If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.
Choose an answer
25%
50%
70%
100%
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Question # 6
The Carnot cycle can be shown by which graph
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P - T graph
P - V Graph
V- T graph
PV -T graph
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Question # 7
When hot and cold water are mixed, the entropy.
Choose an answer
Decreases
Increases
Remain constant
Zero
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Question # 8
The curve representing an adiabatic process is called.
Choose an answer
An adiabatic
An isotherm
Both of these
None of these
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Question # 9
Which is the process in which temperature of the system remains constant.
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Adiabatic process
Isochoric process
Isothermal process
Isobaric process
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Question # 10
The efficiency of any heat engine can never be
Choose an answer
+ve
100%
-ve
None of these
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Question # 11
The potential energy to the molecules of an ideal gas is considered to be.
Choose an answer
Maximum
Zero
1/2 kx
2
1/2 kx
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Question # 12
A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.
Choose an answer
100%
70%
60%
50%
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Question # 13
In thermodynamics system internal energy decrease by 100 J and 100 J of work done on the system then heat lost will be.
Choose an answer
Zero
100 J
200 J
-200 J
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Question # 14
A gas performs 10 J of work while expanding adiabatically. the change in its internal energy is.
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10 J
-10 J
100 J
-200 J
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Question # 15
The difference between tow molar capacities is equal to.
Choose an answer
Plank's constant
General gas equation
Molar gas constant
Boltzmann constant
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Question # 16
A cycle of petrol engine undergoes
Choose an answer
Two process
Three process
Four process
single process
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Question # 17
Heat is form of.
Choose an answer
Power
Momentum
Energy
Torque
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Question # 18
In case the work done in zero.
Choose an answer
Constant pressure
Constant volume
Constant temperature
Constant mass
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