ECAT Pre General Science Physics Chapter 11 MCQ Test With Answer

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

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

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ECAT Pre General Science Physics Chapter 11 Heat & Thermodynamics

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Question # 1

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 2

Boyle's law is applicable in

Question # 3

Real gases strictly obey gas law at:

Question # 4

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 5

Good absorbers of heat are

Question # 6

Average KE of a gas molecule has:

Question # 7

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 8

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 9

The pressure exerted by the gas is

Question # 10

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 # 11

Hotness and coldness of an object is represented in terms:

Question # 12

A real gas can be approximated to an ideal gas at

Question # 13

In the formula P = N0KT, N0denotes:

Question # 14

The efficiency of diesel engine is

Question # 15

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 16

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 17

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

Question # 18

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 19

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

Question # 20

The temperature of gas is produced by

Question # 21

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

Question # 22

The number of translation degress of freedom for a diatomic gas is

Question # 23

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 24

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 25

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 26

The example of reversible process is

Question # 27

A reversible cycle is the one in which

Question # 28

Triple point of water is

Question # 29

When heat is removed from the system

Question # 30

While deriving equation of pressure by kinetic theory of gases, we take into account:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Which of the following is not an assumption of kinetic energy
A. a finite volume of gas consists of very large number of molecules
B. the gas molecules are in random motion
C. collision between the gas molecules are inelastic
D. the size of the gas molecules is much smaller than the separation between molecules
2 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
3 The product of the pressure and volume of an ideal gas is
A. A constant
B. Approximately equal to the universal gas constant
C. Directly proportional to its temperature
D. Inversely proportional to its temperature
4 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
5 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
6 The state in which ice, water and vapour coexists in equilibrium is called
A. zero degree celsius
B. zero degree fahrenheit
C. absolute zero
D. 373 K
7 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
8 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
9 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
10 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them

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