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

The internal energy of a system does not depend upon the

Question # 2

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 3

The motion of molecules in gases is:

Question # 4

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

Question # 5

The earliest heat engine was

Question # 6

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 7

The example of irreversible process is

Question # 8

Internal energy is the sum of all the forms of

Question # 9

Carnot heat engine only used

Question # 10

Real gases strictly obey gas law at:

Question # 11

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

Question # 12

The percentage of available heat energy converted into work by a diesel engine is roughly

Question # 13

We cannot utilize the heat contents of oceans and atmosphere because

Question # 14

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 # 15

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

Question # 16

In thermodynamics, internal energy is the function of

Question # 17

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

Question # 18

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 19

If the distance between two charges is doubled, the force between them will become:

Question # 20

In an adiabatic expansion, the temperature of the gas

Question # 21

Rate of diffusion is

Question # 22

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

Question # 23

Sadi carnot described an ideal heat engine in

Question # 24

The bicycle pump provides a good example of

Question # 25

A carnot cycle consists of

Question # 26

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

Question # 27

In an adiabatic process the work is done at the expense of the

Question # 28

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

Question # 29

Absolute temperature can be calculated by

Question # 30

In the formula P = N0KT, N0denotes:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
2 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
3 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
4 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
5 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
6 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated
7 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
8 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
9 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
10 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

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