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

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

Question # 2

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 3

Absolute zero is considered as that temperature at which:

Question # 4

We cannot utilize the heat contents of oceans and atmosphere because

Question # 5

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 # 6

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

Question # 7

The motion of molecules in gases is:

Question # 8

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

Question # 9

Truth of kinetic energy is confirmed by:

Question # 10

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 # 11

The temperature of gas is produced by

Question # 12

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 13

Boyle's law is applicable in

Question # 14

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

Question # 15

The only significant motion possessed by the mono-atomic gas represented is:

Question # 16

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

Question # 17

First law of thermodynamics is consequence of conservation of

Question # 18

A real gas can be approximated to an ideal gas at

Question # 19

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 20

The ideal gas law is

Question # 21

The bicycle pump provides a good example of

Question # 22

Carnot heat engine only used

Question # 23

The volume of universal gas constant R is:

Question # 24

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

Question # 25

The Boltzman constant has the value

Question # 26

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

Question # 27

A process is a reversible process, if the entropy of the system

Question # 28

Good absorbers of heat are

Question # 29

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

Question # 30

When the temperature of source and sink of a heat engine become equal entropy change will be

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them
2 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
3 Which of the following does not have the same units:
A. Work
B. Heat
C. Kinetic energy
D. Power
4 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
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 In the formula P = N0KT, N0denotes:
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
7 Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
8 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
9 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
10 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids

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