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Online Tests
Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers
Question # 1
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
Choose an answer
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 # 2
The basis to define a temperature scale that is independent of material properties is provided by
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carbon cycle
nitrogen cycle
Carnot cycle
irreversible cycle
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Question # 3
The volume of a gas will be double of what it is at 0
°C (pressure remaining constant) at
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546 K
273 K
546
°C
273
°C
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Question # 4
The pressure exerted by the gas is
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directly proportional to the P.E
inversely proportional to the P.E
inversely proportional to the K.E
directly proportional to the K.E
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Question # 5
Sadi carnot described an ideal heat engine in
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1820
1840
1860
1880
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Question # 6
If the distance between two charges is doubled, the force between them will become:
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Double
Half
Three times
One fourth
One third
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Question # 7
The work done by the system on its environment is considered as
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positive
negative
zero
any one of them
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Question # 8
10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
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Each have same number of molecules
Don't have same number of molecules
Can't be predicted
None
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Question # 9
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 # 10
We can express the work in term of
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directly measurable variables
indirectly measurable variables
either of them
both of them
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Question # 11
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 # 12
At what temperature the adiabatic change is equivalent to the isothermal change?
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Zero degree Celsius
Zero Kelvin
Critical temperature
Above critical temperature
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Question # 13
The percentage of available heat energy converted into work by a petrol engine is roughly
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35 %
40 %
35 to 40 %
25 %
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Question # 14
Maximum density of H
2
O is at the temperature
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32
°F
39.2
°F
42
°F
4
°F
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Question # 15
When heat is removed from the system
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negative
positive
zero
any one of them
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Question # 16
First law of thermodynamic is special case of
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Law of conservation of energy
Charle's law
Law of conservation of mass
Boyle's law
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Question # 17
If R is gas constant for 1 gram mole, C
p
and C
v
are specific heat for a solid then
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C
p
- C
v
= R
C
p
- C
v < R
C
p
- C
v = 0
C
p
- C
v > R
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Question # 18
The state in which ice, water and vapour coexists in equilibrium is called
Choose an answer
zero degree celsius
zero degree fahrenheit
absolute zero
373 K
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Question # 19
One kilogram of different substances contain
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same number of molecules
different number of molecules
may be same or different
none of them
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Question # 20
Energy gas behaves like an ideal gast at
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High temperature and low pressure
Low temperature and high pressure
Both A and B
None
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Question # 21
The unit of thermodynamical scale is
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centigrade
fahrenheit
kelvin
none of them
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Question # 22
For the working of a heat engine, there must be
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a source of heat at high temperature
a sink at low temperature
both of them
none of them
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Question # 23
According to kinetic theory of gases, molecules of a gas behave like
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Inelastic spheres
Perfectly elastic rigid sphere
Perfectly elastic non-rigid spheres
Inelastic non-rigid spheres
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Question # 24
While deriving the equation for pressure of a gas we consider the
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rotational motion of molecules
vibrational motion of molecules
linear motion of molecules
all of them
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Question # 25
Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be
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R/2
P
2P
Depending on the relative mass of the gases
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Question # 26
A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
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1/2
More than 1/2
Less than 1/2
Between 1 and 2
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Question # 27
Truth of kinetic energy is confirmed by:
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Diffusion of gases
Brownian motion
Both A and B
None of these
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Question # 28
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 # 29
Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
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heat capacity
specific heat capacity
specific heat at constant volume
specific heat at constant pressure
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Question # 30
The behaviour of gases is well accounted by the kinetic theory based on
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microscopic approach
macroscopic approach
both of them
none of them
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Question # 31
The Boltzman constant has the value
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1.38 x 10
-23
JK
-1
1.28 x 10
-23
JK
-1
1.38 x 10
-26
JK
-1
1.28 x 10
-26
JK
-1
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