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Online Tests
11th Class Part 1 Physics Chapter 11 Test Online MCQs With Answers
Question # 1
The ideal gas law is.
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PV =NVk
P = NkT
PV =nRT
P=nRT
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Question # 2
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 # 3
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 # 4
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 # 5
The temperature scale which is independent of nature of substance is.
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Thermodynamic scale
Centigrade scale
Fahrenheit scale
Regnault scale
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Question # 6
The actual efficiency of property turned petrol engine is.
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20% to 30%
30% to 35%
40% to 45%
25% to 30%
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Question # 7
Pascal is the unit of
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Pressure
Force
Tension
Weight
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Question # 8
the work done in isochoric process is.
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Constant
Variable
Zero
Depend upon condition
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Question # 9
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 # 10
No spark plug is needed in the
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Petrol engine
Diesel engine
Gas engine
Water engine
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Question # 11
During adiabatic process, which factor remains constant.
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Entropy
Pressure
Momentum
Power
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Question # 12
When hot and cold water are mixed, the entropy.
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Decreases
Increases
Remain constant
Zero
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Question # 13
For working of heat engine, there must be
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A source
A sink
Ether of these
Both of them
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Question # 14
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 # 15
Efficiency of steam locomotive is.
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8%
10%
9%
7%
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Question # 16
Which remains constant in an adiabatic process.
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Volume
Pressure
entropy
temperature
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Question # 17
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 # 18
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 # 19
If heat is added to a system, then its entropy will.
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Increases and positive
Decrease and positive
Increases but negative
Decreases but negative
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Question # 20
The internal energy of a piece of lead when beaten by hammer will.
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Increase
Decrease
Remains constant
Increases and then decrease
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Question # 21
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 # 22
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 # 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
According to first law of thermodynamics the quantity which is conserved.
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Force
Momentum
Energy
Power
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Question # 25
A Carnot engine has an efficiency of 50% when its sink temperature is at 27
o
C. The temperature of source.
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273
o
C
300
o
C
327
o
C
373
o
C
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