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

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

Question # 2

Pressure exerted by a gas is

Question # 3

Rice takes longest to cook

Question # 4

During the whole carnot cycle

Question # 5

The temperature of gas is produced by

Question # 6

Absolute temperature can be calculated by

Question # 7

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 # 8

If the formula PV = nRT, n denotes:

Question # 9

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

Question # 10

The efficiency of diesel engine is

Question # 11

Heat travels through vacuum by

Question # 12

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 13

Triple point of water is

Question # 14

On colliding in a closed container, the gas molecules

Question # 15

The internal energy of a system does not depend upon the

Question # 16

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 # 17

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

Question # 18

Real gases strictly obey gas law at:

Question # 19

A carnot cycle consists of

Question # 20

If an amount of heat enters the system it could

Question # 21

Which of the following is not thermo dynamical function?

Question # 22

The behaviour of gases is well accounted by the kinetic theory based on

Question # 23

A diatomic gas molecule has

Question # 24

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

Question # 25

In an adiabatic expansion, the temperature of the gas

Question # 26

The absolute temperature for an ideal gas is

Question # 27

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

Question # 28

The unit of thermodynamical scale is

Question # 29

A reversible cycle is the one in which

Question # 30

In which process the condition for the application of Boyle's law on the gas is fulfilled

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ECAT Chapter 11 Important MCQ's

Sr.# Question Answer
1 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
2 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
3 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
4 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
A. 300°C
B. 573°C
C. 600°C
D. 743°C
5 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
6 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
7 Sadi carnot described an ideal heat engine in
A. 1820
B. 1840
C. 1860
D. 1880
8 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
9 An isochoric process is one which take place at
A. Constant internal energy
B. Constant entropy
C. Constant volume
D. Constant pressure
10 First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about
A. how heat is absorbed
B. how heat extracted
C. how this conversion takes place
D. none of them

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