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

Melting point of ice

Question # 2

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

Question # 3

First law of thermodynamics is consequence of conservation of

Question # 4

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

Question # 5

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

Question # 6

Real gases strictly obey gas law at:

Question # 7

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

Question # 8

For the working of a heat engine, there must be

Question # 9

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

Question # 10

The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

Question # 11

The volume of universal gas constant R is:

Question # 12

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

Question # 13

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

Question # 14

Efficiency of carnot engine is independent of the

Question # 15

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 # 16

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

Question # 17

The second law of thermodynamics is concerned with the circumstances in which

Question # 18

If the formula PV = nRT, n denotes:

Question # 19

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

Question # 20

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

Question # 21

The efficiency of petrol engine is usually not more than 25% to 30% because of

Question # 22

The absolute temperature of the tripple point of water is

Question # 23

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

Question # 24

First law of thermodynamic is special case of

Question # 25

According to the second law, which is must to produce work

Question # 26

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

Question # 27

The curve representing an isothermal process is called

Question # 28

The temperature scale approved in SI units is:

Question # 29

Triple point of water is

Question # 30

The state in which ice, water and vapour coexists in equilibrium is called

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 While deriving equation of pressure by kinetic theory of gases, we take into account:
A. Only linear motion of molecules
B. Only rotational motion
C. Only vibratory motion
D. All of these
2 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them
3 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
4 If the distance between two charges is doubled, the force between them will become:
A. Double
B. Half
C. Three times
D. One fourth
5 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
6 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
7 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed
A. adiabatically
B. isothermally
C. isochorcally
D. isobarically
8 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
9 The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called
A. heat capacity
B. specific heat capacity
C. molar specific heat
D. molar specific heat at constant volume
10 Melting point of ice
A. Increases with increasing pressure
B. Decreases with increasing pressure
C. Is independent of pressure
D. Is proportional to pressure

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