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

Which of the following is not thermo dynamical function?

Question # 2

The value of E0in coulomb's law is:

Question # 3

Melting point of ice

Question # 4

In all natural processes where heat flows from one system to another, there is always a net

Question # 5

We can express the work in term of

Question # 6

At constant volume temperature is increased. Then

Question # 7

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

Question # 8

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 # 9

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 # 10

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

Question # 11

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

Question # 12

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 13

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

Question # 14

Real gases strictly obey gas law at:

Question # 15

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

Question # 16

Boyle's law is applicable in

Question # 17

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

Question # 18

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

Question # 19

During the whole carnot cycle

Question # 20

Pressure of a gas at constant volume is proportion to

Question # 21

At absolute temperature, the kinetic energy of the molecules

Question # 22

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 23

Average KE of a gas molecule has:

Question # 24

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

Question # 25

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

Question # 26

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

Question # 27

When heat is removed from the system

Question # 28

Electromagnetic waves emitted by hot bodies are called:

Question # 29

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

Question # 30

The internal energy of a system does not depend upon the

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
2 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
3 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
4 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
5 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
6 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
7 The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at
A. 546 K
B. 273 K
C. 546°C
D. 273°C
8 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
9 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
10 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them

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