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Online Tests
ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers
Question # 1
We cannot utilize the heat contents of oceans and atmosphere because
Choose an answer
there is no reservoir at the same temperature
there is no reservoir at the temperature lower than any one of two
there is no reservoir at the temperature higher than any one of two
none of them
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Question # 2
First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
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how heat is absorbed
how heat extracted
how this conversion takes place
none of them
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Question # 3
Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
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Newton's second law
Pascal's law
Carnot theorem
Second law of thermodynamics
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Question # 4
The earliest heat engine was
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petrol engine
diesel engine
electric engine
steam engine
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Question # 5
On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
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outwards
inwards
in either way
none of these
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Question # 6
A process is a reversible process, if the entropy of the system
Choose an answer
increases
decreases
remains constant
none of them
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Question # 7
If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is
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P=P/V<1/2mv
2
>
P=2N/V<1/2mv
2
>
P=2/3N/V<1/2mv
2
>
P=2/3N/V<mv
2
>
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Question # 8
Melting point of ice
Choose an answer
Increases with increasing pressure
Decreases with increasing pressure
Is independent of pressure
Is proportional to pressure
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Question # 9
Efficiency of carnot engine is independent of the
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temperature of sink
temperature of source
nature of the working substances
none of them
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Question # 10
At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
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81 K
355 K
627 K
627
°C
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Question # 11
On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
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adiabatically
isothermally
isochorcally
isobarically
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Question # 12
Gas constant per molecule is called:
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Universal gas constant
Stefen's constant
Boltzmann constant
Gravitation constant
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Question # 13
Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
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N = nN
A
m = MN
A
n = N N
A
, M = mN
A
M = N
A
/N , N
A
= m/n
N = nN
A
, M = mN
A
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Question # 14
The coefficient of linear expansion of iron is 0.000011 per
°K. An iron rod is 10 metre long at 27
°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to
Choose an answer
0
°C
10
°C
17
°C
20
°C
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Question # 15
The heat required to raise the temperature of one mole of the substance through 1 K is called
Choose an answer
heat capacity
specific heat capacity
molar specific heat
all of them
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