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

According to kinetic theory of gases, molecules of a gas behave like

Question # 2

Real gases strictly obey gas law at:

Question # 3

The internal energy of a system does not depend upon the

Question # 4

Maximum density of H2O is at the temperature

Question # 5

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 6

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

Question # 7

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

Question # 8

The Boltzman constant has the value

Question # 9

Energy gas behaves like an ideal gast at

Question # 10

When heat is removed from the system

Question # 11

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

Question # 12

In an adiabatic expansion, the temperature of the gas

Question # 13

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

Question # 14

Which of the following is not an example of adiabatic process

Question # 15

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

Question # 16

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

Question # 17

Which of the following is not thermo dynamical function?

Question # 18

If an amount of heat enters the system it could

Question # 19

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

Question # 20

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

Question # 21

The unit of thermodynamical scale is

Question # 22

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 23

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 24

Truth of kinetic energy is confirmed by:

Question # 25

The example of irreversible process is

Question # 26

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 # 27

In the formula P = N0KT, N0denotes:

Question # 28

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

Question # 29

For the working of a heat engine, there must be

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 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
3
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
4 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
5 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
6 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
7 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
8 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
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
9 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
10 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1

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