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 heat is added into the system then change in entropy is

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

The nature of thermal radiation is similar to:

Question # 6

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

Question # 7

In the theory of dimensional analysis, heat may be properly represented by:

Question # 8

According to kinetic theory of gases, molecules of a gas behave like

Question # 9

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

Question # 10

If an amount of heat enters the system it could

Question # 11

Efficiency of carnot engine is independent of the

Question # 12

A heat engine is that which converts

Question # 13

If the formula PV = nRT, n denotes:

Question # 14

The volume of universal gas constant R is:

Question # 15

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

Question # 16

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

Question # 17

The pressure exerted by the gas is

Question # 18

The curve representing an isothermal process is called

Question # 19

When heat is removed from the system

Question # 20

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the:

Question # 21

A diatomic gas molecule has

Question # 22

The motion of molecules in gases is:

Question # 23

A real gas can be approximated to an ideal gas at

Question # 24

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

Question # 25

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

Question # 26

In a heat engine, heat is supplied by the

Question # 27

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

Question # 28

Pressure of a gas at constant volume is proportion to

Question # 29

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

Question # 30

Pressure may be define as _______ per second per unit area:

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 The percentage of available heat energy converted into work by a diesel engine is roughly
A. 35 %`
B. 40 %
C. 35 - 40 %
D. 25 %
2 A process is a reversible process, if the entropy of the system
A. increases
B. decreases
C. remains constant
D. none of them
3 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
4 In a heat engine, heat is supplied by the
A. cold reservoir
B. sink
C. hot reservoir
D. none of them
5 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
6 The state in which ice, water and vapour coexists in equilibrium is called
A. zero degree celsius
B. zero degree fahrenheit
C. absolute zero
D. 373 K
7 In case of an ideal gas, the P.E associated with its molecule is
A. maximum
B. zero
C. minimum
D. not fixed
8 Amount of heat required to raise the temperature of a body through 1 K is called its
A. Specific heat
B. Water equivalent
C. Thermal capacity
D. Entropy
9 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
10 A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
A. reversible process
B. irreversible process
C. any one of them
D. none of them

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