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 efficiency of diesel engine is

Question # 2

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

Question # 3

The product of the pressure and volume of an ideal gas is

Question # 4

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

Question # 5

Electromagnetic waves emitted by hot bodies are called:

Question # 6

At absolute temperature, the kinetic energy of the molecules

Question # 7

Pressure exerted by a gas is

Question # 8

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 9

Maximum density of H2O is at the temperature

Question # 10

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

Question # 11

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

Question # 12

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

Question # 13

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 # 14

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

Question # 15

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

Question # 16

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 # 17

Triple point of water is

Question # 18

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 # 19

If the formula PV = nRT, n denotes:

Question # 20

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 21

For the working of a heat engine, there must be

Question # 22

Efficiency of carnot engine is independent of the

Question # 23

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 24

Pressure of a gas at constant volume is proportion to

Question # 25

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 26

A real gas can be approximated to an ideal gas at

Question # 27

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

Question # 28

First law of thermodynamic is special case of

Question # 29

On colliding in a closed container, the gas molecules

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
2 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
3 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
4 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
5 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
6 What temperature is the same on Celsius scale as well as on Fahrenheit scale?
A. 32°C
B. -32°C
C. -40°C
D. -212°C
7 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
8 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
9 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
10 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

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