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

Rate of diffusion is

Question # 2

The curve representing an adiabatic process is called

Question # 3

The curve representing an isothermal process is called

Question # 4

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

Question # 5

At O° K which of the following properties of a gas will be zero?

Question # 6

Rice takes longest to cook

Question # 7

Which of the following does not have the same units:

Question # 8

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 9

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 # 10

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

Question # 11

The nature of thermal radiation is similar to:

Question # 12

Melting point of ice

Question # 13

The rate of change of momentum of a molecule is equal to:

Question # 14

The work done by the system on its environment is considered as

Question # 15

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

Question # 16

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 # 17

We can express the work in term of

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Pressure of a gas at constant volume is proportion to

Question # 22

In the theory of dimensional analysis, heat may be properly represented by:

Question # 23

Carnot heat engine only used

Question # 24

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 25

A succession of events which bring the system back to its initial condition is called

Question # 26

Average KE of a gas molecule has:

Question # 27

Electromagnetic waves emitted by hot bodies are called:

Question # 28

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

Question # 29

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

Question # 30

In all natural processes where heat flows from one system to another, there is always a net

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 No spark plug is needed in
A. petrol engine
B. diesel engine
C. both of them
D. none of them
4 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
A. 0 J
B. 2 J
C. 5 J
D. 10 J
5 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
6 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
7 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
8 First law of thermodynamics is consequence of conservation of
A. Work
B. Energy
C. Heat
D. All of these
9 If a liquid is heated in weightlessness, the heat is transmitted through
A. Conduction
B. Convection
C. Radiation
D. Neither, because the liquid cannot be heated in weightlessness
10 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

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