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

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 # 2

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

Question # 3

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

Question # 4

Average KE of a gas molecule has:

Question # 5

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

Question # 6

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

Question # 7

Maximum density of H2O is at the temperature

Question # 8

Carnot heat engine only used

Question # 9

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

Question # 10

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

Question # 11

Internal energy is the sum of all the forms of

Question # 12

On colliding in a closed container, the gas molecules

Question # 13

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

Question # 14

The earliest heat engine was

Question # 15

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

Question # 16

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

Question # 17

First law of thermodynamics is consequence of conservation of

Question # 18

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

Question # 19

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

Question # 20

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 # 21

The unit of thermodynamical scale is

Question # 22

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

Question # 23

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

Question # 24

A succession of events which bring the system back to its initial condition is called

Question # 25

When heat is removed from the system

Question # 26

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

Question # 27

A reversible cycle is the one in which

Question # 28

A real gas can be approximated to an ideal gas at

Question # 29

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

Question # 30

At constant volume temperature is increased. Then

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
2 At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be
A. 81 K
B. 355 K
C. 627 K
D. 627°C
3 The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be
A. 2.0 x 10-5/°C
B. 4.0x10-5/°C
C. 6.0x10-5/°C
D. 2.33x10-5/°C
4 The process which is carried out at constant temperature is known as
A. adiabatic process
B. isothermal process
C. isochoric process
D. none of them
5 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
6 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
7 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
8 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
9 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
10 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%

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