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 second law of thermodynamics is concerned with the circumstances in which

Question # 2

Rice takes longest to cook

Question # 3

The internal energy of a system does not depend upon the

Question # 4

On colliding in a closed container, the gas molecules

Question # 5

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

Question # 6

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

Question # 7

In an adiabatic expansion, the temperature of the gas

Question # 8

If the distance between two charges is doubled, the force between them will become:

Question # 9

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 10

In all natural processes where heat flows from one system to another, there is always a net

Question # 11

Brownian motion increases due to

Question # 12

Pressure exerted by a gas is

Question # 13

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

Question # 14

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

Question # 15

Carnot heat engine only used

Question # 16

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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

Specific heat at constant pressure is greater than the specific heat at constant volume because

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

Melting point of ice

Question # 24

A reversible cycle is the one in which

Question # 25

The ideal gas law is

Question # 26

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

Question # 27

The example of reversible process is

Question # 28

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 29

Internal energy is the sum of all the forms of

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The unit of thermodynamical scale is
A. centigrade
B. fahrenheit
C. kelvin
D. none of them
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 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
A. Newton's second law
B. Pascal's law
C. Carnot theorem
D. Second law of thermodynamics
4 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
A. 100 K
B. 273 K
C. 0 K
D. -273 K
5 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
6 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
7 If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:
A. Force
B. Density
C. Work done
D. Pressure
8 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
9 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
10 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

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