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

The state in which ice, water and vapour coexists in equilibrium is called

Question # 2

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 # 3

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

Question # 4

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

Question # 5

If 42 J heat is transferred to the system and the work done by the system is 32 J then what will be the change in internal energy

Question # 6

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

Question # 7

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 # 8

One kilogram of different substances contain

Question # 9

Amount of heat required to raise the temperature of a body through 1 K is called its

Question # 10

The absolute temperature of the tripple point of water is

Question # 11

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

Question # 12

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

Question # 13

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

Question # 14

Good absorbers of heat are

Question # 15

First law of thermodynamics is consequence of conservation of

Question # 16

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

Question # 17

Truth of kinetic energy is confirmed by:

Question # 18

The example of reversible process is

Question # 19

If a liquid is heated in weightlessness, the heat is transmitted through

Question # 20

In an ideal gas, the molecules have:

Question # 21

We can express the work in term of

Question # 22

The nature of thermal radiation is similar to:

Question # 23

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

Question # 24

Pressure of a gas at constant volume is proportion to

Question # 25

The unit of thermodynamical scale is

Question # 26

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

Question # 27

The value of E0in coulomb's law is:

Question # 28

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

Question # 29

For the working of a heat engine, there must be

Question # 30

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

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Sr.# Question Answer
1 If a process cannot be retraced in the backward direction by reversing the controlling factors, it is
A. a reversible process
B. an irreversible process
C. any one of them
D. both of them
2 When the temperature of source and sink of a heat engine become equal entropy change will be
A. Zero
B. Max
C. Min
D. -ve
3 For making cooking utensils, which of the following pairs of properties is most suited?
A. Low specific heat and high conductivity
B. Low specific heat and low conductivity
C. High specific heat and high conductivity
D. High specific heat and low conductivity
4 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:
A. -2 mv
B. Zero
C. 2 mv
D. mv
5 Electromagnetic waves emitted by hot bodies are called:
A. Photoelectrons
B. Alpha rays
C. Thermal radiation
D. None of these
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 In the formula P = N0KT, N0denotes:
A. Number of molecules per unit per volume
B. Number of moles
C. Number of molecules
D. None of these
8 The percentage of available heat energy converted into work by a petrol engine is roughly
A. 35 %
B. 40 %
C. 35 to 40 %
D. 25 %
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 Real gases strictly obey gas law at:
A. High pressure and low temperatures
B. Low pressures and high temperatures
C. High pressures and high temperatures
D. None of these
11 The work done by the system on its environment is considered as
A. positive
B. negative
C. zero
D. any one of them
12 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
13 The curve representing an isothermal process is called
A. adiabat
B. isotherm
C. fixed temperature
D. none of them
14 A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be
A. 1/2
B. More than 1/2
C. Less than 1/2
D. Between 1 and 2
15 If the volume of the gas is to be increased by 4 times, then
A. Temperature and pressure must be doubled
B. At constant P the temperature must be increased by 4 times
C. At constant T the pressure must be increased by four times
D. It cannot be increased
16 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
17 Which of the following is not an example of adiabatic process
A. the rapid escape of air from a burst type
B. the rapid expansion and compression of air through which a sound wave is passing
C. cloud formation in the atmosphere
D. none of them
18 If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of
A. second law thermodynamics
B. first law of thermodynamics
C. third law of thermodynamics
D. none of them
19 Internal energy is the sum of all the forms of
A. K.E
B. P.E
C. both of them
D. none of them
20 The behaviour of gases is well accounted by the kinetic theory based on
A. microscopic approach
B. macroscopic approach
C. both of them
D. none of them
21 The disorder in the system increases due to the
A. removal of heat
B. addition of heat
C. removal or addition of heat
D. none of them
22 We can express the work in term of
A. directly measurable variables
B. indirectly measurable variables
C. either of them
D. both of them
23 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
24 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
25 At absolute temperature, the kinetic energy of the molecules
A. Becomes zero
B. Becomes maximum
C. Becomes minimum
D. Remain constant
26 The value of E0in coulomb's law is:
A. 9 x 109Nm2C-2
B. 8.85 x 10-12C2N-1m-2
C. 8.85 x 10-12Nm2C-2
D. 9 x 109C2N-1m-2
27 A reversible cycle is the one in which
A. some of the changes are reversible
B. all of the changes are reversible
C. all of the changes are irreversible
D. none of them
28 When heat is added into the system then change in entropy is
A. negative
B. positive
C. zero
D. any one of them
29 Pressure exerted by a gas is
A. Independent of density of the gas
B. Inversely proportional to the density of the gas
C. Directly proportional to the square of the density of the gas
D. Directly proportional to the density of the gas
30 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

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