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

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

Question # 2

Internal energy is the sum of all the forms of

Question # 3

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

Question # 4

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 # 5

First law of thermodynamics is consequence of conservation of

Question # 6

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

Question # 7

Adiabatic change occurs when the gas

Question # 8

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

Question # 9

An isochoric process is one which take place at

Question # 10

No spark plug is needed in

Question # 11

A heat engine is that which converts

Question # 12

A carnot cycle consists of

Question # 13

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

Question # 14

Sadi carnot described an ideal heat engine in

Question # 15

We can express the work in term of

Question # 16

The motion of molecules in gases is:

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

Efficiency of carnot engine is independent of the

Question # 21

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

Question # 22

When heat is removed from the system

Question # 23

In thermodynamics, internal energy is the function of

Question # 24

Which of the following is a state variable

Question # 25

Which quantity is important in stating the entropy of the system

Question # 26

Absolute temperature can be calculated by

Question # 27

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

Question # 28

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

Question # 29

The earliest heat engine was

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
4 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:
A. N = nNAm = MNA
B. n = N NA, M = mNA
C. M = NA/N , NA= m/n
D. N = nNA, M = mNA
5 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
6 The volume of universal gas constant R is:
A. 8.314 J/K mole K
B. 8314 J/K mole K
C. 8.314 J/mole K
D. None of these
7 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
8 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
9 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
10 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2

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