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 a liquid is heated in weightlessness, the heat is transmitted through

Question # 2

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

Question # 3

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 4

The example of irreversible process is

Question # 5

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

Question # 6

Which of the following does not have the same units:

Question # 7

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 8

While deriving the equation for pressure of a gas we consider the

Question # 9

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 10

The example of reversible process is

Question # 11

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

Question # 12

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 13

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 14

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

Question # 15

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

Question # 16

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 17

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 # 18

Real gases strictly obey gas law at:

Question # 19

At constant volume temperature is increased. Then

Question # 20

The unit of thermodynamical scale is

Question # 21

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

Question # 22

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 23

When two objects come to common temperature, the body is said to be in:

Question # 24

The motion of molecules in gases is:

Question # 25

Which of the following is not an example of adiabatic process

Question # 26

We cannot utilize the heat contents of oceans and atmosphere because

Question # 27

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

Question # 28

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

Question # 29

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 30

The temperature of gas is produced by

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to
A. 0°C
B. 10°C
C. 17°C
D. 20°C
2
During the whole carnot cycle
A. Thermal equilibrium is maintained
B. mechanical equilibrium is maintained
C. both the thermal and mechanical equilibriumis maintained
D. both the thermal and mechanical equilibrium is not maintained
3 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
4 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
5 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
6 Which quantity is important in stating the entropy of the system
A. initial entropy
B. final entropy
C. change in entropy
D. none of them
7 In an adiabatic process the work is done at the expense of the
A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them
8 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one 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 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%

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