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

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

Question # 2

Average KE of a gas molecule has:

Question # 3

In thermodynamics, internal energy is the function of

Question # 4

Brownian motion increases due to

Question # 5

At constant volume temperature is increased. Then

Question # 6

On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands

Question # 7

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

Question # 8

A process in which no heat enters or leaves the system is called

Question # 9

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

Question # 10

The only significant motion possessed by the mono-atomic gas represented is:

Question # 11

In all natural processes where heat flows from one system to another, there is always a net

Question # 12

The value of E0in coulomb's law is:

Question # 13

A heat engine is that which converts

Question # 14

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

Question # 15

During the whole carnot cycle

Question # 16

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

Question # 17

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

Question # 18

Electromagnetic waves emitted by hot bodies are called:

Question # 19

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

Question # 20

Real gases strictly obey gas law at:

Question # 21

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

Question # 22

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 # 23

First law of thermodynamics is consequence of conservation of

Question # 24

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

Question # 25

The earliest heat engine was

Question # 26

One mole of any substance contain

Question # 27

When two objects are rubbed together, their internal energy

Question # 28

Carnot heat engine only used

Question # 29

A carnot cycle consists of

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 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
2 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
3 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
4 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
5 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
6 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
7 At O° K which of the following properties of a gas will be zero?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
8 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
9 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
10 Which of the following is a state variable
A. entropy
B. pressure
C. volume
D. all of them

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