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

A carnot cycle consists of

Question # 2

During the whole carnot cycle

Question # 3

The process which is carried out at constant temperature is known as

Question # 4

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

Question # 5

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

Question # 6

The Boltzman constant has the value

Question # 7

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

Question # 8

Triple point of water is

Question # 9

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

Question # 10

In which process the condition for the application of Boyle's law on the gas is fulfilled

Question # 11

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

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

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

Question # 14

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 # 15

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

Question # 16

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

Question # 17

If the formula PV = nRT, n denotes:

Question # 18

In an adiabatic expansion, the temperature of the gas

Question # 19

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

Question # 20

Electromagnetic waves emitted by hot bodies are called:

Question # 21

Rice takes longest to cook

Question # 22

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

Question # 23

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

Question # 24

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 25

The bicycle pump provides a good example of

Question # 26

Pressure of a gas at constant volume is proportion to

Question # 27

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

Question # 28

The efficiency of diesel engine is

Question # 29

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 30

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
2 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
3 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
4 Generally a temperature scale is established by using certain physical properties of a material which varies
A. nonlinearly with temperature
B. linearly with temperature
C. either of them
D. none of them
5 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
6 What temperature is the same on Celsius scale as well as on Fahrenheit scale?
A. 32°C
B. -32°C
C. -40°C
D. -212°C
7 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
8 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
9 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
10 In an adiabatic process the work is done at the expense of the
A. energy supplied to the system
B. energy gained from the surroundings
C. internal energy
D. none of them

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