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Online Tests
PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers
Question # 1
If temperature of the sink is decreased the efficiency of a Carnot engine
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Increases
Decreases
Remains constant
First increases and thend ecreases
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Question # 2
A Carnot engine can be 100% efficient of the sink is at.
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0 k
0 oF
0 oC
273 K
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Question # 3
When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.
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An increase in pressure
An increase in temperature
A change in phase
A change in entropy
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Question # 4
In which thermodynamic process enthalpy of the system remains constant.
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Isenthalpic process
Isolated process
Isobaric process
Isochoric process
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Question # 5
Which of the following phenomenon gives evidence of the molecular structure of mater
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Evaporation
Diffusion
Brownian movement
All of the above
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Question # 6
One calorie equals to
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1.2 J
2.2 J
3.2 J
4.2 J
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Question # 7
When the temperature of a body is equal to that of the surrounding then the body appears
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Dull black
Red hot
In thermal equilibrium
To be cold
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Question # 8
The pressure necessary to liquify a gas at the critical temperature is called.
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Normal pressure
Atmospheric pressure
Critical pressure
Liquid pressure
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Question # 9
if temperature eon Celsius scale is 50 oC the temperature on Fahrenheit scale will be.
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102
o
F
108
o
F
112
o
F
122
o
F
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Question # 10
If a gas does 10 J of external work white expanding then the change in internal energy is equal to.
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0 J
10 J
-10 J
100 J
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Question # 11
The efficiency of Carnot engine is
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Less than one
Zero
Greeter than one
Infinite
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Question # 12
Triple point of water in Kelvin scale is
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0 K
100 K
273 .15 K
373.15 K
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Question # 13
The ratio between the energy dissipated in some process and the heat that appears as a result is the
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Specific heat
Mechanical equivalent of heat
Kilocalories
Triple point
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Question # 14
Which of the following should not change in an Isothermal process.
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Volume
Pressure
Temperature
All of these
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Question # 15
First law of thermodynamics is a
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Boyle 's law
Charles' law
Law of energy conservation
Steffen Boltzmann law
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Question # 16
Which thermometer is called sprint thermometer
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Alcohol thermometer
Mercury in glass thermometer
Gas thermometer
Radiation thermometer
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Question # 17
What is the represented by the area inside the Carnot cycle.
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Heat taken to increase the body temperature.
Energy loss due to leakage
Useful work done
Heat rejected by the system
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Question # 18
A cup of coffee at 80
o
C is left to cool to 30 oc if the heat capacity of the cup and coffee is 2.0 kJ k-1 how much heat is released during the cooling.
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0.04 kJ
100 KJ
60 kJ
160 kJ
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Question # 19
The specific heat of an ideal gas values as
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To
T1
T2
T3
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Question # 20
If two gases have same reduced pressure volume and temperature it is according to
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Boyle's law
Charles law
Law of corresponding state
Zeroth law
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Question # 21
In which temperature range water decreases in volume with increasing temperature.
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From 0
o
C to 4
o
C
from 0
o
C to 10
o
C
from 50
o
C to 100
o
C
from 75
o
C to 100
o
C
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