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

Question # 2

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 # 3

The ideal gas law is

Question # 4

First law of thermodynamics is consequence of conservation of

Question # 5

In the reverse process, the working substance passes through the same stages as in the direct process and

Question # 6

At constant volume temperature is increased. Then

Question # 7

The nature of thermal radiation is similar to:

Question # 8

A typical four stroke petrol engine undergoes how many successive processes in each cycle

Question # 9

The motion of molecules in gases is:

Question # 10

The Boltzman constant has the value

Question # 11

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 12

A process is a reversible process, if the entropy of the system

Question # 13

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

Question # 14

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

Question # 15

The internal energy of a system does not depend upon the

Question # 16

While deriving the equation for pressure of a gas we consider the

Question # 17

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 # 18

The curve representing an adiabatic process is called

Question # 19

Triple point of water is

Question # 20

Generally a temperature scale is established by

Question # 21

Real gases strictly obey gas law at:

Question # 22

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 23

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 # 24

Absolute zero is considered as that temperature at which:

Question # 25

In thermodynamics, internal energy is the function of

Question # 26

In a heat engine, heat is supplied by the

Question # 27

If an amount of heat enters the system it could

Question # 28

No spark plug is needed in

Question # 29

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

Question # 30

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
2 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
3 Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is
A. 1 : 2
B. 2 : 3
C. 3 : 4
D. 8 : 9
4 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
5 Triple point of water is
A. 273.16°F
B. 372.16K
C. 273.16°F
D. 273.16
6 While deriving the equation for pressure of a gas we consider the
A. rotational motion of molecules
B. vibrational motion of molecules
C. linear motion of molecules
D. all of them
7 Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure
A. A greater than than of B
B. A is equal to that of B
C. A is less than that of B
D. A is twice the pressure of B
8 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
9 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
10 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them

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