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Online Tests
ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers
Question # 1
The efficiency of petrol engine is usually not more than 25% to 30% because of
Choose an answer
friction
heat losses
both of them
none of them
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Question # 2
The second law of thermodynamics is concerned with the circumstances in which
Choose an answer
heat can be converted into work
direction of flow of heat
none of them
both of them
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Question # 3
In which process the condition for the application of Boyle's law on the gas is fulfilled
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isochoric process
adiabatic process
isothermal process
none of them
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Question # 4
The heat required to raise the temperature of one mole of the substance through 1 K is called
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heat capacity
specific heat capacity
molar specific heat
all of them
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Question # 5
The curve representing an isothermal process is called
Choose an answer
adiabat
isotherm
fixed temperature
none of them
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Question # 6
Electromagnetic waves emitted by hot bodies are called:
Choose an answer
Photoelectrons
Alpha rays
Thermal radiation
None of these
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Question # 7
If the volume of the gas is to be increased by 4 times, then
Choose an answer
Temperature and pressure must be doubled
At constant P the temperature must be increased by 4 times
At constant T the pressure must be increased by four times
It cannot be increased
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Question # 8
The only significant motion possessed by the mono-atomic gas represented is:
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Translatory
Rotatory
Vibratory
None of these
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Question # 9
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 # 10
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 # 11
A typical four stroke petrol engine undergoes how many successive processes in each cycle
Choose an answer
one
two
three
four
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Question # 12
Truth of kinetic energy is confirmed by:
Choose an answer
Diffusion of gases
Brownian motion
Both A and B
None of these
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Question # 13
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 # 14
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 # 15
The disorder in the system increases due to the
Choose an answer
removal of heat
addition of heat
removal or addition of heat
none of them
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Question # 16
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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