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

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

Question # 2

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 # 3

Good absorbers of heat are

Question # 4

For the working of a heat engine, there must be

Question # 5

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 # 6

Which of the following is not thermo dynamical function?

Question # 7

The example of irreversible process is

Question # 8

Real gases strictly obey gas law at:

Question # 9

The disorder in the system increases due to the

Question # 10

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

Question # 11

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

Question # 12

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

Question # 13

In an adiabatic expansion, the temperature of the gas

Question # 14

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

Question # 15

Efficiency of carnot engine is independent of the

Question # 16

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

Question # 17

If the volume of the gas is to be increased by 4 times, then

Question # 18

The volume of universal gas constant R is:

Question # 19

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

Question # 20

A reversible cycle is the one in which

Question # 21

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

Question # 22

We can express the work in term of

Question # 23

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

Question # 24

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

Question # 25

Which quantity is important in stating the entropy of the system

Question # 26

One mole of any substance contain

Question # 27

When heat is removed from the system

Question # 28

At constant volume temperature is increased. Then

Question # 29

Rate of diffusion is

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A carnot cycle consists of
A. One step
B. two step
C. three steps
D. four steps
2 When two objects come to common temperature, the body is said to be in:
A. Static equilibrium
B. Dynamic equilibrium
C. Thermal equilibrium
D. None of these
3 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
4 If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
A. 2 : 1
B. 4 : 1
C. 1 : 4
D. 3 : 4
5 The volume of universal gas constant R is:
A. 8.314 J/K mole K
B. 8314 J/K mole K
C. 8.314 J/mole K
D. None of these
6 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%
7 In the reverse process, the working substance passes through the same stages as in the direct process and
A. thermal effects at each stage are exactly reversed
B. mechanical effects at each stage are exactly reversed
C. thermal and mechanical effects at each stage remain the same
D. thermal and mechanical effects at each stage are exactly reversed
8 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
A. 0 J
B. 2 J
C. 5 J
D. 10 J
9 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
10 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K

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