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

Question # 2

In the formula P = N0KT, N0denotes:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

Question # 7

Melting point of ice

Question # 8

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

Question # 9

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

Question # 10

Rate of diffusion is

Question # 11

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

Question # 12

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

Question # 13

The disorder in the system increases due to the

Question # 14

The number of translation degress of freedom for a diatomic gas is

Question # 15

The earliest heat engine was

Question # 16

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

Question # 17

In an adiabatic expansion, the temperature of the gas

Question # 18

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

Question # 19

Absolute temperature can be calculated by

Question # 20

On colliding in a closed container, the gas molecules

Question # 21

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 # 22

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

Question # 23

The value of E0in coulomb's law is:

Question # 24

Boyle's law is applicable in

Question # 25

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 26

Carnot heat engine only used

Question # 27

The concept of entropy was introduced into the study of thermodynamics in

Question # 28

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

Question # 29

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

Question # 30

If the formula PV = nRT, n denotes:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to
A. 0°C
B. 10°C
C. 17°C
D. 20°C
2 The temperature of gas is produced by
A. At potential energy of its molecules
B. The kinetic energy of its molecules
C. The attractive force between its molecules
D. The repulsive force between its molecules
3 If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy
A. 0 J
B. 2 J
C. 5 J
D. 10 J
4 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
5 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
6 The earliest heat engine was
A. petrol engine
B. diesel engine
C. electric engine
D. steam engine
7 At what temperature the adiabatic change is equivalent to the isothermal change?
A. Zero degree Celsius
B. Zero Kelvin
C. Critical temperature
D. Above critical temperature
8 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
9 Hotness and coldness of an object is represented in terms:
A. Heat
B. Temperature
C. Chemical energy
D. None of these
10 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

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