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

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

Question # 2

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

Question # 3

The internal energy of a system does not depend upon the

Question # 4

If water in a closed bottle is taken up to the moon and opened, the water gets

Question # 5

Carnot heat engine only used

Question # 6

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 7

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

Question # 8

Efficiency of carnot engine is independent of the

Question # 9

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

Question # 10

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

Question # 11

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

Question # 12

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

Question # 13

The curve representing an isothermal process is called

Question # 14

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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 # 21

If an amount of heat enters the system it could

Question # 22

The disorder in the system increases due to the

Question # 23

Truth of kinetic energy is confirmed by:

Question # 24

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

Question # 25

Rate of diffusion is

Question # 26

Gas constant per molecule is called:

Question # 27

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

Question # 28

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 29

Sadi carnot described an ideal heat engine in

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
2 The relationship between Boltzmann constant k with R and NAis given as:
A. k = RNA
B. k =R/NA
C. k = NR/NA
D. None of these
3 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
4 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
5 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
6 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
7 A heat engine is that which converts
A. mechanical energy into thermal energy
B. thermal energy into mechanical energy
C. K.E into potential energy
D. heat energy into light energy
8 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
9 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them
10 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

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