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

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

Question # 2

Melting point of ice

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Energy gas behaves like an ideal gast at

Question # 7

Boyle's law is applicable in

Question # 8

During the whole carnot cycle

Question # 9

The example of irreversible process is

Question # 10

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

Question # 11

Real gases strictly obey gas law at:

Question # 12

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

Question # 13

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

Question # 14

If R is gas constant for 1 gram mole, Cpand Cvare specific heat for a solid then

Question # 15

If an amount of heat enters the system it could

Question # 16

The temperature of gas is produced by

Question # 17

The curve representing an isothermal process is called

Question # 18

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

Question # 19

First law of thermodynamics is consequence of conservation of

Question # 20

Triple point of water is

Question # 21

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

Question # 22

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

Question # 23

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

Question # 24

The earliest heat engine was

Question # 25

We cannot utilize the heat contents of oceans and atmosphere because

Question # 26

A diatomic gas molecule has

Question # 27

The efficiency of diesel engine is

Question # 28

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

Question # 29

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

Question # 30

The disorder in the system increases due to the

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
2 The work done on the system by the environment is considered as
A. positive
B. negative
C. zero
D. any one of them
3 On a cold morning a metal surface will fell colder to touch than a wooden surface, because
A. Metal has high specific heat
B. Metal has high thermal conductivity
C. Metal has low specific heat
D. Metal has low thermal conductivity
4 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
5 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
6 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
7 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
8 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
9 One kilogram of different substances contain
A. same number of molecules
B. different number of molecules
C. may be same or different
D. none of them
10 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:
A. Double
B. Remains constant
C. Half
D. None of these

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