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Online Tests
Physics Fsc Part 1 Chapter 11 Online Test MCQs With Answers
Question # 1
Almost all the raw energy is librated from
Choose an answer
Heat
Earth
Light
All of these
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Question # 2
Average translational K.E. of molecules for an ideal gas is given as
Choose an answer
1/2 KT
KT
2/3 KT
3/2 KT
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Question # 3
Which of following is irreversible process
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Slow compression of an elastic spring
Slow evaporation of substances in isolated vessel
Slow expansion of a gas
A chemical explosion
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Question # 4
An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.
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0 K
0
o
C
100 K
100
o
C
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Question # 5
Force acting on the piston to move outward is.
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Compressive stoke
Power stoke
All stoke
Exhaust stoke
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Question # 6
Mercury is used as a thermometric substance because
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It is opaque
Does not stick to glass
Has low specific heat
All of these
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Question # 7
The kinetic energy of molecules of an ideal gas at absolute zero is
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Very low
Very high
Zero
First increases then decreases
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Question # 8
In the thermodynamics process , the equation W = -delta U represents.
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Isothermal expension
Isothermal compression
Adiabatic expansion
Adiabatic compression
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Question # 9
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 # 10
For working of heat engine, there must be.
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A source
A sink
either of these
Both of these
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Question # 11
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 # 12
The increase in thermal pollution of environment means.
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Increase in the entropy
Decrease in the entropy
Entropy remains constant
Entropy becomes zero
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Question # 13
The efficiency of any heat engine can never be
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+ve
100%
-ve
None of these
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Question # 14
No spark plug is needed in the
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Petrol engine
Diesel engine
Gas engine
Water engine
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Question # 15
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 # 16
The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.
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0
o
C
0 K
0
o
F
100 K
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Question # 17
For a diatomic gas Cv= 5R/2 then gamma for this gas is.
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5/7
4/35
7/5
35/4
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Question # 18
The collision between the gas molecules is
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Elastic
Inelastic
Both a and b
None of these
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Question # 19
In reversible process the entropy of system.
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Remain constant
Decrease
Increase
Becomes zero
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Question # 20
Value of triple point of water is given as.
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Zero K
100 K
273.16 K
373.16 K
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Question # 21
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 # 22
Cloud formation in atmosphere is an example of.
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Isothermal process
Isochoric process
Adiabatic process
Isobaric process
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Question # 23
The curve representing an adiabatic process is called.
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An adiabatic
An isotherm
Both of these
None of these
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Question # 24
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 # 25
The unit o pressure of gas is
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Nm
-2
Pascal
Atmosphere
All of these
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