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

Internal energy is the sum of all the forms of

Question # 2

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 # 3

An isochoric process is one which take place at

Question # 4

In thermodynamics, internal energy is the function of

Question # 5

Boyle's law is applicable in

Question # 6

The curve representing an adiabatic process is called

Question # 7

Carnot heat engine only used

Question # 8

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

Question # 9

The nature of thermal radiation is similar to:

Question # 10

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 11

We cannot utilize the heat contents of oceans and atmosphere because

Question # 12

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

Question # 13

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

Question # 14

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 # 15

The second law of thermodynamics is concerned with the circumstances in which

Question # 16

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

Question # 17

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 18

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 19

No spark plug is needed in

Question # 20

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

Question # 21

The process which is carried out at constant temperature is known as

Question # 22

The volume of universal gas constant R is:

Question # 23

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

Question # 24

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 25

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

Question # 26

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

Question # 27

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 # 28

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

Question # 29

If the formula PV = nRT, n denotes:

Question # 30

The pressure exerted by the gas is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
2 A diatomic gas molecule has
A. translational energy
B. rotaional energy
C. vibrational energy
D. all of them
3 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
4 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
5 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
6 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
7 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
8 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
9 One mole of any substance contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
10 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them

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