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

Pressure exerted by a gas is

Question # 2

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

Question # 3

A carnot cycle consists of

Question # 4

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

Question # 5

The efficiency of diesel engine is

Question # 6

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

Question # 7

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 8

Rice takes longest to cook

Question # 9

The unit of thermodynamical scale is

Question # 10

Hotness and coldness of an object is represented in terms:

Question # 11

When heat is removed from the system

Question # 12

The only significant motion possessed by the mono-atomic gas represented is:

Question # 13

Pressure may be define as _______ per second per unit area:

Question # 14

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

Question # 15

Adiabatic change occurs when the gas

Question # 16

If an amount of heat enters the system it could

Question # 17

We cannot utilize the heat contents of oceans and atmosphere because

Question # 18

The state in which ice, water and vapour coexists in equilibrium is called

Question # 19

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 20

The temperature scale approved in SI units is:

Question # 21

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 22

Gas constant per molecule is called:

Question # 23

The Boltzman constant has the value

Question # 24

Triple point of water is

Question # 25

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

A real gas can be approximated to an ideal gas at

Question # 30

The ideal gas law is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
2 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
3 The internal energy of an ideal gas system is generally the
A. translational K.E of molecules
B. vibrational K.E of molecules
C. rotational K.E of molecules
D. all of them
4 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
5 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
6 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
7 Since the absolute scale is independent of the property of the working substance, hence, can be applied at
A. very high temperature
B. very low temperature
C. any one of them
D. none of them
8 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
9 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them
10 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

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