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

A process in which no heat enters or leaves the system is called

Question # 2

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

Question # 3

The Boltzman constant has the value

Question # 4

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

Question # 5

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

Question # 6

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

Question # 7

The basis to define a temperature scale that is independent of material properties is provided by

Question # 8

Absolute temperature can be calculated by

Question # 9

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

Question # 10

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

Question # 11

First law of thermodynamic is special case of

Question # 12

Which of the following is not thermo dynamical function?

Question # 13

The relationship between Boltzmann constant k with R and NAis given as:

Question # 14

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 15

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

Question # 16

When two objects come to common temperature, the body is said to be in:

Question # 17

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 # 18

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

Question # 19

In a heat engine, heat is supplied by the

Question # 20

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 21

Melting point of ice

Question # 22

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

Question # 23

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

Question # 24

Real gases strictly obey gas law at:

Question # 25

If the formula PV = nRT, n denotes:

Question # 26

Which of the following is not an assumption of kinetic energy

Question # 27

In thermodynamics, internal energy is the function of

Question # 28

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 # 29

The internal energy of an ideal gas system is generally the

Question # 30

The nature of thermal radiation is similar to:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
2 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
3 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
4 The motion of molecules in gases is:
A. Orderly
B. Random
C. Circular
D. All of these
5 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
6 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
7 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
8 Truth of kinetic energy is confirmed by:
A. Diffusion of gases
B. Brownian motion
C. Both A and B
D. None of these
9 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these
10 If water in a closed bottle is taken up to the moon and opened, the water gets
A. Freeze
B. Boiled
C. Dissociated into O2and H2
D. Evaporated

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