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 temperature of gas is produced by

Question # 2

The example of reversible process is

Question # 3

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

Question # 4

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 5

When heat is removed from the system

Question # 6

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

Question # 7

The earliest heat engine was

Question # 8

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

Question # 9

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 # 10

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

Question # 11

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 # 12

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

Question # 13

According to the second law, which is must to produce work

Question # 14

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

Question # 15

A reversible cycle is the one in which

Question # 16

In a heat engine, heat is supplied by the

Question # 17

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

Question # 18

Hotness and coldness of an object is represented in terms:

Question # 19

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

Question # 20

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 21

In thermodynamics, internal energy is the function of

Question # 22

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

Question # 23

Which of the following is not an example of adiabatic process

Question # 24

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

Question # 25

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

Question # 26

Generally a temperature scale is established by using certain physical properties of a material which varies

Question # 27

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 28

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

Question # 29

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
2 In the study of thermodynamics, which gas is considered as the working substance
A. real gas
B. ideal gas
C. any gas may be ideal or real
D. none of them
3 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
4 Efficiency of carnot engine is independent of the
A. temperature of sink
B. temperature of source
C. nature of the working substances
D. none of them
5 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
6 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
7 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
8 Brownian motion increases due to
A. Increase in size of Brownian particle
B. Increase in temperature of medium
C. Increase in density of medium
D. Increase in viscosity of medium
9 At constant temperature, if the density of the gas is increased, its pressure will:
A. One kg of a substance
B. Unit volume of a substance
C. One mole of a substance
D. None of these
10 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these

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