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Online Tests
Physics Fsc Part 1 Chapter 11 Online Test MCQs With Answers
Question # 1
The temperature scale which is independent of nature of substance is.
Choose an answer
Thermodynamic scale
Centigrade scale
Fahrenheit scale
Regnault scale
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Question # 2
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 # 3
Size of the molecules is much smaller as compared to the
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Mass of the molecules
Distance between the molecules
Density of the molecules
Volume of the molecules
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Question # 4
The unit o pressure of gas is
Choose an answer
Nm
-2
Pascal
Atmosphere
All of these
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Question # 5
The internal energy of system does not depend on
Choose an answer
Temperature
Pressure
Path
Final and initial state
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Question # 6
For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.
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Double
Three fold
One half
Remains the same
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Question # 7
The mean kinetic energy of gas is at.
Choose an answer
0
o
C
-273
o
C
100 K
100
o
C
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Question # 8
The efficiency of any heat engine can never be
Choose an answer
+ve
100%
-ve
None of these
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Question # 9
No spark plug is needed in the
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Petrol engine
Diesel engine
Gas engine
Water engine
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Question # 10
The efficiency of heat engine whose sink is at 17
o
C and source at 200
o
C is.
Choose an answer
38%
63%
80%
90%
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Question # 11
If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.
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25%
50%
70%
100%
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Question # 12
Entropy of measure of.
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Internal energy of system
Order of system
Disorder of system
Potential energy of system
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Question # 13
The SI unit of product of pressure and volume is.
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Watt
Joule
Pascal
Newton
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Question # 14
Which remains constant in an adiabatic process.
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Volume
Pressure
entropy
temperature
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Question # 15
Pascal is the unit of
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Pressure
Force
Tension
Weight
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Question # 16
An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.
Choose an answer
0 K
0
o
C
100 K
100
o
C
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Question # 17
When hot and cold water are mixed, the entropy.
Choose an answer
Decreases
Increases
Remain constant
Zero
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Question # 18
A device based upon the thermodynamics property of matter is called.
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Calorimeter
Heat engine
thermometer
Voltmeter
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Question # 19
A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.
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28o J
920 J
600 J
200 J
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Question # 20
Efficiency of a heat engine working between 27
o
C and 32
o
C will be.
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50%
90%
40%
62%
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Question # 21
A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.
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100%
70%
60%
50%
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Question # 22
Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be
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3/4
9/16
4/3
10/9
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Question # 23
The temperature of human body on Kelvin scale is
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210K
310K
410K
510K
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Question # 24
In thermodynamics system internal energy decrease by 100 J and 100 J of work done on the system then heat lost will be.
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Zero
100 J
200 J
-200 J
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Question # 25
the change in internal energy is defined as
Choose an answer
Q - W
Q-T
Q + P
Q - P
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