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

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

Question # 2

The Boltzman constant has the value

Question # 3

Which of the following does not have the same units:

Question # 4

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 5

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

Question # 6

A carnot cycle consists of

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Which of the following is not an example of adiabatic process

Question # 11

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

Question # 12

The efficiency of diesel engine is

Question # 13

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

Question # 14

Real gases strictly obey gas law at:

Question # 15

Gas constant per molecule is called:

Question # 16

Internal energy is the sum of all the forms of

Question # 17

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

Question # 18

In the formula P = N0KT, N0denotes:

Question # 19

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

Question # 20

A process in which no heat enters or leaves the system is called

Question # 21

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

Question # 22

The curve representing an adiabatic process is called

Question # 23

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

Question # 24

The temperature scale approved in SI units is:

Question # 25

In case of an ideal gas, the P.E associated with its molecule is

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

A succession of events which bring the system back to its initial condition 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 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C
2 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
3 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
A. P=P/V<1/2mv2>
B. P=2N/V<1/2mv2>
C. P=2/3N/V<1/2mv2>
D. P=2/3N/V<mv2>
4 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
5 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C
6 The absolute temperature of the tripple point of water is
A. 100°C
B. 4°C
C. 373 K
D. 273.16 K
7 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
8 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
9 The internal energy of a system does not depend upon the
A. initial state of the system
B. final state of the system
C. path
D. none of them
10 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them

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