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

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 2

According to the second law, which is must to produce work

Question # 3

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

Question # 4

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

Question # 5

Average KE of a gas molecule has:

Question # 6

At absolute temperature, the kinetic energy of the molecules

Question # 7

According to kinetic theory of gases, molecules of a gas behave like

Question # 8

First law of thermodynamics is consequence of conservation of

Question # 9

Maximum density of H2O is at the temperature

Question # 10

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

Question # 11

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

Question # 12

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 13

Energy gas behaves like an ideal gast at

Question # 14

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 # 15

The ideal gas law is

Question # 16

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 # 17

Sadi carnot described an ideal heat engine in

Question # 18

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

Question # 19

The example of irreversible process is

Question # 20

Triple point of water is

Question # 21

Pressure of a gas at constant volume is proportion to

Question # 22

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

Question # 23

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

Question # 24

The behaviour of gases is well accounted by the kinetic theory based on

Question # 25

The concept of entropy was introduced into the study of thermodynamics in

Question # 26

In an adiabatic expansion, the temperature of the gas

Question # 27

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

Question # 28

For the working of a heat engine, there must be

Question # 29

The bicycle pump provides a good example of

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
3 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
4 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
5 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
6 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
7 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
8 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
9 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
10 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them

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