ECAT Pre Engineering Physics Chapter 11 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics

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Question # 1

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

Question # 2

When heat is removed from the system

Question # 3

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

Question # 4

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

Question # 5

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

Question # 6

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

Question # 7

One kilogram of different substances contain

Question # 8

For making cooking utensils, which of the following pairs of properties is most suited?

Question # 9

Absolute zero is considered as that temperature at which:

Question # 10

At O° K which of the following properties of a gas will be zero?

Question # 11

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

Question # 12

The curve representing an isothermal process is called

Question # 13

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

Question # 14

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

Question # 15

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

Question # 16

At absolute temperature, the kinetic energy of the molecules

Question # 17

Rice takes longest to cook

Question # 18

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 # 19

Which of the following is a state variable

Question # 20

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

Question # 21

The curve representing an adiabatic process is called

Question # 22

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

Question # 23

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

Question # 24

When heat is added into the system then change in entropy is

Question # 25

Heat travels through vacuum by

Question # 26

One mole of any substance contain

Question # 27

Carnot heat engine only used

Question # 28

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

Question # 29

Boyle's law is applicable in

Question # 30

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

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Sr.# Question Answer
1 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
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
A. 0°C
B. 10°C
C. 17°C
D. 20°C
3 The curve representing an adiabatic process is called
A. isotherm
B. adiabat
C. adiable
D. none of them
4 The absolute temperature for an ideal gas is
A. directly proportional to the rotational K.E of gas molecules
B. directly proportional to the vibrational K.E of gas molecules
C. directly proportional to the average translational K.E.of gas molecules
D. directly proportional to the P.E. of gas molecules
5 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
6 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
7 The only significant motion possessed by the mono-atomic gas represented is:
A. Translatory
B. Rotatory
C. Vibratory
D. None of these
8 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
9 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
10 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
11 Generally a temperature scale is established by
A. one fixed point
B. two fixed point
C. three fixed point
D. four fixed point
12 The number of translation degress of freedom for a diatomic gas is
A. 2
B. 3
C. 5
D. 6
13 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
14 The efficiency of petrol engine is usually not more than 25% to 30% because of
A. friction
B. heat losses
C. both of them
D. none of them
15 The rate of change of momentum of a molecule is equal to:
A. Pressure
B. Work
C. Density
D. Force
16 For the working of a heat engine, there must be
A. a source of heat at high temperature
B. a sink at low temperature
C. both of them
D. none of them
17 Average KE of a gas molecule has:
A. Direct relation with absolute temperature and inverse relation with pressure
B. Direction relation with both absolute temperature and pressure
C. Inverse relation with both absolute temperature and pressure
D. None of these
18 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
19 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
20 Rate of diffusion is
A. Faster in solids than in liquids and gases
B. Faster in liquids than in solids and gases
C. Equal to solids, liquids and gases
D. Faster in gases than in liquids and solids
21 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
22 What temperature is the same on Celsius scale as well as on Fahrenheit scale?
A. 32°C
B. -32°C
C. -40°C
D. -212°C
23 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
24 Carnot heat engine only used
A. isothermal processes
B. adiabatic processes
C. both of them
D. none of them
25 When heat is removed from the system
A. negative
B. positive
C. zero
D. any one of them
26 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
A. Clausius statement of second law
B. Kelvin'sstatement of second law
C. Clausius statement of first law
D. Kelvin's statement of first law
27 A typical four stroke petrol engine undergoes how many successive processes in each cycle
A. one
B. two
C. three
D. four
28 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
29 Energy gas behaves like an ideal gast at
A. High temperature and low pressure
B. Low temperature and high pressure
C. Both A and B
D. None
30 An irreversible heat flow from a hot to cold substances of a system, causes the disorder to
A. decrease
B. remains the same
C. increase
D. any one of them

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