ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

Internal energy is the sum of all the forms of

Question # 2

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 3

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 4

The disorder in the system increases due to the

Question # 5

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 6

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

Question # 7

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 8

In all natural processes where heat flows from one system to another, there is always a net

Question # 9

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 10

Boyle's law is applicable in

Question # 11

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 12

Pressure may be define as _______ per second per unit area:

Question # 13

For the working of a heat engine, there must be

Question # 14

Pressure of a gas at constant volume is proportion to

Question # 15

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 16

The curve representing an isothermal process is called

Question # 17

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 18

The curve representing an adiabatic process is called

Question # 19

Generally a temperature scale is established by

Question # 20

The internal energy of a system does not depend upon the

Question # 21

The rate of change of momentum of a molecule is equal to:

Question # 22

Which of the following does not have the same units:

Question # 23

Which of the following is not an assumption of kinetic energy

Question # 24

The internal energy of an ideal gas system is generally the

Question # 25

Energy gas behaves like an ideal gast at

Question # 26

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Question # 27

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 28

A real gas can be approximated to an ideal gas at

Question # 29

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 30

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
2 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
3 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
4 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
5 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
6 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
7 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
8 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
9 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
10 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these

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