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 unit of thermodynamical scale is

Question # 2

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

Question # 3

Triple point of water is

Question # 4

During the whole carnot cycle

Question # 5

Pressure of a gas at constant volume is proportion to

Question # 6

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

Question # 7

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

Question # 8

Which of the following does not have the same units:

Question # 9

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

Question # 10

At constant temperature, if the density of the gas is increased, its pressure will:

Question # 11

When the temperature of source and sink of a heat engine become equal entropy change will be

Question # 12

The work done on the system by the environment is considered as

Question # 13

In an adiabatic expansion, the temperature of the gas

Question # 14

Maximum density of H2O is at the temperature

Question # 15

The curve representing an isothermal process is called

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

The example of irreversible process is

Question # 20

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

Question # 21

The motion of molecules in gases is:

Question # 22

Which of the following is a state variable

Question # 23

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

Question # 24

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

Question # 25

Internal energy is the sum of all the forms of

Question # 26

The behaviour of gases is well accounted by the kinetic theory based on

Question # 27

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

Question # 28

At O° K which of the following properties of a gas will be zero?

Question # 29

At absolute temperature, the kinetic energy of the molecules

Question # 30

Sadi carnot described an ideal heat engine in

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 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
2 The nature of thermal radiation is similar to:
A. Ultraviolet rays
B. Light rays
C. Both of them
D. None of these
3 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
4 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
5 A succession of events which bring the system back to its initial condition is called
A. reversible process
B. irreversible process
C. a cycle
D. none of them
6 First law of thermodynamic is special case of
A. Law of conservation of energy
B. Charle's law
C. Law of conservation of mass
D. Boyle's law
7 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
8 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
9 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
10 The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at
A. 546 K
B. 273 K
C. 546°C
D. 273°C

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