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

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

Question # 2

Which of the following is not an assumption of kinetic energy

Question # 3

In the study of thermodynamics, which gas is considered as the working substance

Question # 4

Which quantity is important in stating the entropy of the system

Question # 5

When two objects come to common temperature, the body is said to be in:

Question # 6

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

Question # 7

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 8

If the volume of the gas is to be increased by 4 times, then

Question # 9

Absolute temperature can be calculated by

Question # 10

The product of the pressure and volume of an ideal gas is

Question # 11

Boyle's law is applicable in

Question # 12

A diatomic gas molecule has

Question # 13

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 14

For the working of a heat engine, there must be

Question # 15

Pressure of a gas at constant volume is proportion to

Question # 16

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 17

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

Question # 18

A real gas can be approximated to an ideal gas at

Question # 19

Which of the following is not thermo dynamical function?

Question # 20

The basis to define a temperature scale that is independent of material properties is provided by

Question # 21

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 22

No spark plug is needed in

Question # 23

The absolute temperature of the tripple point of water is

Question # 24

Sadi carnot described an ideal heat engine in

Question # 25

Adiabatic change occurs when the gas

Question # 26

When heat is added into the system then change in entropy is

Question # 27

At O° K which of the following properties of a gas will be zero?

Question # 28

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

Question # 29

The work done by the system on its environment is considered as

Question # 30

The motion of molecules in gases is:

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ECAT Class Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
2 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
3 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
4 Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called
A. heat capacity
B. specific heat capacity
C. specific heat at constant volume
D. specific heat at constant pressure
5 Absolute zero is considered as that temperature at which:
A. All liquid become gases
B. All gases become liquid
C. Water freezes
D. None of these
6 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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
7 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them
8 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
9 The curve representing an adiabatic process is called
A. isotherm
B. adiabat
C. adiable
D. none of them
10 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

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