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

Sadi carnot described an ideal heat engine in

Question # 2

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

Question # 3

Triple point of water is

Question # 4

The work done by the system on its environment is considered as

Question # 5

The nature of thermal radiation is similar to:

Question # 6

We can express the work in term of

Question # 7

A process in which no heat enters or leaves the system is called

Question # 8

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

Question # 9

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 # 10

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

Question # 11

First law of thermodynamics is consequence of conservation of

Question # 12

Adiabatic change occurs when the gas

Question # 13

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

Question # 14

Pressure of a gas at constant volume is proportion to

Question # 15

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 # 16

Absolute temperature can be calculated by

Question # 17

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

Question # 18

During the whole carnot cycle

Question # 19

In thermodynamics, internal energy is the function of

Question # 20

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

Question # 21

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

Question # 22

The temperature of gas is produced by

Question # 23

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 # 24

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

Question # 25

In an adiabatic expansion, the temperature of the gas

Question # 26

Internal energy is the sum of all the forms of

Question # 27

One mole of any substance contain

Question # 28

Maximum density of H2O is at the temperature

Question # 29

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

Question # 30

The value of E0in coulomb's law is:

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Sr.# Question Answer
1 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
A. 0 J
B. 2 J
C. 5 J
D. 10 J
2 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
3 In an adiabatic expansion, the temperature of the gas
A. increases
B. becomes zero
C. decreases
D. decreases rapidly
4 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
5 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
6 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
7 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
8 The second law of thermodynamics is concerned with the circumstances in which
A. heat can be converted into work
B. direction of flow of heat
C. none of them
D. both of them
9 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
10 The example of irreversible process is
A. slowly liquification
B. slowly evaporation
C. an explosion
D. all of them
11 Which of the following is not thermo dynamical function?
A. Enthalpy
B. Work done
C. Gibb's energy
D. Internal energy
12 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
13 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
14 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is
A. 70%
B. 100%
C. 35%
D. 38%
15 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
16 The efficiency of diesel engine is
A. 25%
B. 25 - 30%
C. 35%
D. 35 - 40%
17 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:
A. Force
B. Density
C. Work done
D. Pressure
18 Absolute zero is considered as that temperature at which:
A. All liquid become gases
B. All gases become liquid
C. Water freezes
D. None of these
19 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
20 When two objects are rubbed together, their internal energy
A. remains same
B. decreases
C. remains the same then decreases
D. increases
21 The concept of entropy was introduced into the study of thermodynamics in
A. 1856
B. 1865
C. 1656
D. 1685
22 Boyle's law is applicable in
A. Isochoric process
B. Isothermal process
C. Isobaric process
D. Isotonic process
23 In which process the condition for the application of Boyle's law on the gas is fulfilled
A. isochoric process
B. adiabatic process
C. isothermal process
D. none of them
24 The Boltzman constant has the value
A. 1.38 x 10-23JK-1
B. 1.28 x 10-23JK-1
C. 1.38 x 10-26JK-1
D. 1.28 x 10-26JK-1
25 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
26 The ideal gas law is
A. P = nRT
B. V = nRT
C. PV =RT
D. PV =nRT
27 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
28 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:
A. Ideal gas
B. Inert gas
C. Real gas
D. None of these
29 In the theory of dimensional analysis, heat may be properly represented by:
A. ML2T-2
B. MT-2
C. ML-1T-1
D. None of these
30 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 %

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