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

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

Question # 2

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

Question # 3

The curve representing an adiabatic process is called

Question # 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

Question # 5

First law of thermodynamics is consequence of conservation of

Question # 6

Absolute zero is considered as that temperature at which:

Question # 7

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

Question # 8

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

Question # 9

Real gases strictly obey gas law at:

Question # 10

Truth of kinetic energy is confirmed by:

Question # 11

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

Question # 12

No spark plug is needed in

Question # 13

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

Question # 14

The state in which ice, water and vapour coexists in equilibrium is called

Question # 15

The earliest heat engine was

Question # 16

Heat travels through vacuum by

Question # 17

Good absorbers of heat are

Question # 18

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 # 19

Which of the following is not an example of adiabatic process

Question # 20

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

Question # 21

One kilogram of different substances contain

Question # 22

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

Question # 23

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

Question # 24

In a heat engine, heat is supplied by the

Question # 25

Which of the following is not thermo dynamical function?

Question # 26

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

Question # 27

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 # 28

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

Question # 29

The disorder in the system increases due to the

Question # 30

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Gas constant per molecule is called:
A. Universal gas constant
B. Stefen's constant
C. Boltzmann constant
D. Gravitation constant
2 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
3 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
4 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
5 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
6 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
7 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
8 R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes
A. 2V
B. 3V
C. 0.5V
D. V
9
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
10 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these

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