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 value of E0in coulomb's law is:

Question # 2

The internal energy of an ideal gas system is generally the

Question # 3

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

Question # 4

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

Question # 5

In the formula P = N0KT, N0denotes:

Question # 6

Real gases strictly obey gas law at:

Question # 7

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

Question # 8

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

Question # 9

The temperature scale approved in SI units is:

Question # 10

Electromagnetic waves emitted by hot bodies are called:

Question # 11

The second law of thermodynamics is concerned with the circumstances in which

Question # 12

In an adiabatic expansion, the temperature of the gas

Question # 13

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

Question # 14

Heat travels through vacuum by

Question # 15

An isochoric process is one which take place at

Question # 16

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

Question # 17

The disorder in the system increases due to the

Question # 18

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

Question # 19

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 # 20

The internal energy of a system does not depend upon the

Question # 21

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

Question # 22

Brownian motion increases due to

Question # 23

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

Question # 24

Adiabatic change occurs when the gas

Question # 25

At constant volume temperature is increased. Then

Question # 26

Boyle's law is applicable in

Question # 27

We can express the work in term of

Question # 28

In case of an ideal gas, the P.E associated with its molecule is

Question # 29

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

Question # 30

A diatomic gas molecule has

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
2 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
3 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them
4 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
5 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
6 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
7 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
8 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
9 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
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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