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

00:00
Question # 1

Carnot heat engine only used

Question # 2

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

Question # 3

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

Question # 4

One mole of any substance contain

Question # 5

In case of an ideal gas, the P.E associated with its molecule is

Question # 6

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

Question # 7

The efficiency of diesel engine is

Question # 8

Brownian motion increases due to

Question # 9

The value of E0in coulomb's law is:

Question # 10

No spark plug is needed in

Question # 11

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 # 12

At what temperature the adiabatic change is equivalent to the isothermal change?

Question # 13

A real gas can be approximated to an ideal gas at

Question # 14

In an adiabatic process the work is done at the expense of the

Question # 15

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

Question # 16

If the formula PV = nRT, n denotes:

Question # 17

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

Question # 18

If an amount of heat enters the system it could

Question # 19

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

Question # 20

Which quantity is important in stating the entropy of the system

Question # 21

Real gases strictly obey gas law at:

Question # 22

The absolute temperature for an ideal gas is

Question # 23

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

Question # 24

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

Question # 25

While deriving equation of pressure by kinetic theory of gases, we take into account:

Question # 26

A reversible cycle is the one in which

Question # 27

A diatomic gas molecule has

Question # 28

The ideal gas law is

Question # 29

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

Question # 30

Generally a temperature scale is established by

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ECAT Physics Chapter 11 Important MCQ's

Sr.# Question Answer
1 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
2 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
3 Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be
A. R/2
B. P
C. 2P
D. Depending on the relative mass of the gases
4 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
5 According to the second law, which is must to produce work
A. a source contains a large amount of heat energy
B. two sources at the same temperature
C. two sources at the different temperatures
D. a source contains a small amount of energy
6 On the power stroke, a spark fires the mixtures causing a rapid increase in pressure and temperature and the burning mixture expands
A. adiabatically
B. isothermally
C. isochorically
D. isobarically
7 At constant volume temperature is increased. Then
A. Collision on walls will be less
B. Number of collisions per unit time will increase
C. Collision will be in straight lines
D. Collision will not change
8 Good absorbers of heat are
A. Poor emitters
B. Non emitters
C. Good emitters
D. Highly polarized
9 A process in which no heat enters or leaves the system is called
A. isochoric process
B. isothermal process
C. adiabatic process
D. none of them
10 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

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