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

During the whole carnot cycle

Question # 2

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

Question # 3

If the formula PV = nRT, n denotes:

Question # 4

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

Question # 5

Boyle's law is applicable in

Question # 6

Which of the following is a state variable

Question # 7

Electromagnetic waves emitted by hot bodies are called:

Question # 8

When heat is removed from the system

Question # 9

The ideal gas law is

Question # 10

The heat required to raise the temperature of one mole of the substance through 1 K is called

Question # 11

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 # 12

In an adiabatic process the work is done at the expense of the

Question # 13

The internal energy of an ideal gas system is generally the

Question # 14

If an amount of heat enters the system it could

Question # 15

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

Question # 16

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 # 17

Rate of diffusion is

Question # 18

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

Question # 19

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

Question # 20

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 21

When heat is added into the system then change in entropy is

Question # 22

The disorder in the system increases due to the

Question # 23

Which of the following is not thermo dynamical function?

Question # 24

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

Question # 25

The volume of universal gas constant R is:

Question # 26

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 27

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 # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 If the formula PV = nRT, n denotes:
A. Number of molecules per unit volume
B. Number of moles
C. Number of molecules
D. None of these
3 The example of reversible process is
A. an explosion
B. changes occur suddenly
C. slow compression of a gas
D. all of them
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 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
6 The temperature scale approved in SI units is:
A. Celsius scale
B. Kelvin scale
C. Fehrenheit scale
D. None of these
7 On colliding in a closed container, the gas molecules
A. Transfer momentum to the walls
B. Momentum becomes zero
C. Move in opposite directions
D. Perform Brownian motion
8 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
9 Specific heat at constant pressure is greater than the specific heat at constant volume because
A. Heat is used up to increase temperature at constant pressure
B. Heat is used by gas for expansions purposes at constant pressure
C. Heat is use dup to increase internal energy
D. The above statement is invalid
10 In all natural processes where heat flows from one system to another, there is always a net
A. decrease in entropy
B. increase in entropy
C. decrease or increase in entropy
D. none of them

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