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Online Tests
Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers
Question # 1
Which of the following does not have the same units:
Choose an answer
Work
Heat
Kinetic energy
Power
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Question # 2
A diatomic gas molecule has
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translational energy
rotaional energy
vibrational energy
all of them
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Question # 3
Pressure may be define as _______ per second per unit area:
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Change in force
Change in momentum
Change in energy
Work done
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Question # 4
In the study of thermodynamics, which gas is considered as the working substance
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real gas
ideal gas
any gas may be ideal or real
none of them
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Question # 5
On colliding in a closed container, the gas molecules
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Transfer momentum to the walls
Momentum becomes zero
Move in opposite directions
Perform Brownian motion
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Question # 6
Melting point of ice
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Increases with increasing pressure
Decreases with increasing pressure
Is independent of pressure
Is proportional to pressure
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Question # 7
The percentage of available heat energy converted into work by a diesel engine is roughly
Choose an answer
35 %`
40 %
35 - 40 %
25 %
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Question # 8
The internal energy of an ideal gas system is generally the
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translational K.E of molecules
vibrational K.E of molecules
rotational K.E of molecules
all of them
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Question # 9
The temperature of gas is produced by
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At potential energy of its molecules
The kinetic energy of its molecules
The attractive force between its molecules
The repulsive force between its molecules
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Question # 10
Which of the following is not an assumption of kinetic energy
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a finite volume of gas consists of very large number of molecules
the gas molecules are in random motion
collision between the gas molecules are inelastic
the size of the gas molecules is much smaller than the separation between molecules
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Question # 11
In the formula P = N
0
KT, N
0
denotes:
Choose an answer
Number of molecules per unit per volume
Number of moles
Number of molecules
None of these
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Question # 12
The curve representing an isothermal process is called
Choose an answer
adiabat
isotherm
fixed temperature
none of them
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Question # 13
Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
Choose an answer
Newton's second law
Pascal's law
Carnot theorem
Second law of thermodynamics
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Question # 14
The volume of a gas will be double of what it is at 0
°C (pressure remaining constant) at
Choose an answer
546 K
273 K
546
°C
273
°C
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Question # 15
Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure
Choose an answer
A greater than than of B
A is equal to that of B
A is less than that of B
A is twice the pressure of B
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Question # 16
On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
Choose an answer
adiabatically
isothermally
isochorically
isobarically
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Question # 17
When two objects come to common temperature, the body is said to be in:
Choose an answer
Static equilibrium
Dynamic equilibrium
Thermal equilibrium
None of these
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Question # 18
In all natural processes where heat flows from one system to another, there is always a net
Choose an answer
decrease in entropy
increase in entropy
decrease or increase in entropy
none of them
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Question # 19
Hotness and coldness of an object is represented in terms:
Choose an answer
Heat
Temperature
Chemical energy
None of these
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