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

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 # 2

The relationship between Boltzmann constant k with R and NAis given as:

Question # 3

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

Question # 4

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

Question # 5

Good absorbers of heat are

Question # 6

Efficiency of carnot engine is independent of the

Question # 7

On colliding in a closed container, the gas molecules

Question # 8

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 # 9

At constant volume temperature is increased. Then

Question # 10

The example of reversible process is

Question # 11

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 12

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 13

In the formula P = N0KT, N0denotes:

Question # 14

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

Question # 15

The second law of thermodynamics is concerned with the circumstances in which

Question # 16

Absolute temperature can be calculated by

Question # 17

Pressure of a gas at constant volume is proportion to

Question # 18

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

Question # 19

Which of the following does not have the same units:

Question # 20

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 21

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

Question # 22

The unit of thermodynamical scale is

Question # 23

Electromagnetic waves emitted by hot bodies are called:

Question # 24

A diatomic gas molecule has

Question # 25

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

Question # 26

The example of irreversible process is

Question # 27

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 28

For the working of a heat engine, there must be

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
2 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
3 Heat travels through vacuum by
A. Conduction
B. Convection
C. Radiation
D. Both A and B
4 A succession of events which bring the system back to its initial condition is called
A. reversible process
B. irreversible process
C. a cycle
D. none of them
5 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
6 According to kinetic theory of gases, molecules of a gas behave like
A. Inelastic spheres
B. Perfectly elastic rigid sphere
C. Perfectly elastic non-rigid spheres
D. Inelastic non-rigid spheres
7 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
8 On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves
A. outwards
B. inwards
C. in either way
D. none of these
9 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
10 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force

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