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

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 # 2

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

Question # 3

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 # 4

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

Question # 5

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

Question # 6

In thermodynamics, internal energy is the function of

Question # 7

The motion of molecules in gases is:

Question # 8

Real gases strictly obey gas law at:

Question # 9

The pressure exerted by the gas is

Question # 10

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

Question # 11

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

Question # 12

Which of the following is a state variable

Question # 13

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

Question # 14

Average KE of a gas molecule has:

Question # 15

During the whole carnot cycle

Question # 16

Heat travels through vacuum by

Question # 17

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

Question # 18

The number of translation degress of freedom for a diatomic gas is

Question # 19

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

Question # 20

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

Question # 21

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

Question # 22

Melting point of ice

Question # 23

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

Question # 24

Hotness and coldness of an object is represented in terms:

Question # 25

A real gas can be approximated to an ideal gas at

Question # 26

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

Question # 27

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

Question # 28

The product of the pressure and volume of an ideal gas is

Question # 29

Gas constant per molecule is called:

Question # 30

For the working of a heat engine, there must be

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Sr. # Question Answer
1 The number of translation degress of freedom for a diatomic gas is

A. 2

B. 3

C.5

D. 6

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

A. Conduction

B. Convection

C.Radiation

D. Neither, because the liquid cannot be heated in weightlessness

3 In a heat engine, heat is supplied by the

A. cold reservoir

B. sink

C.hot reservoir

D. none of them

4 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

A. N = nNAm = MNA

B. n = N NA, M = mNA

C.M = NA/N , NA= m/n

D. N = nNA, M = mNA

5 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

6 The unit of thermodynamical scale is

A. centigrade

B. fahrenheit

C.kelvin

D. none of them

7 We can express the work in term of

A. directly measurable variables

B. indirectly measurable variables

C.either of them

D. both of them

8 Triple point of water is

A. 273.16°F

B. 372.16K

C.273.16°F

D. 273.16

9 The bicycle pump provides a good example of

A. first law of thermodynamics

B. second law of thermodynamics

C.third law of thermodynamics

D. none of them

10 When two objects come to common temperature, the body is said to be in:

A. Static equilibrium

B. Dynamic equilibrium

C.Thermal equilibrium

D. None of these

11 The example of reversible process is

A. an explosion

B. changes occur suddenly

C.slow compression of a gas

D. all of them

12 Carnot heat engine only used

A. isothermal processes

B. adiabatic processes

C.both of them

D. none of them

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

A. Change in force

B. Change in momentum

C.Change in energy

D. Work done

14 If the distance between two charges is doubled, the force between them will become:

A. Double

B. Half

C.Three times

D. One fourth

15 Good absorbers of heat are

A. Poor emitters

B. Non emitters

C.Good emitters

D. Highly polarized

16 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

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

A. Non-uniform density

B. uniform density

C.high density

D. low density

18 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

19 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

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

A. Zero degree Celsius

B. Zero Kelvin

C.Critical temperature

D. Above critical temperature

21 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

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

A. decrease in entropy

B. increase in entropy

C.decrease or increase in entropy

D. none of them

23 The product of the pressure and volume of an ideal gas is

A. A constant

B. Approximately equal to the universal gas constant

C.Directly proportional to its temperature

D. Inversely proportional to its temperature

24 Maximum density of H2O is at the temperature

A. 32°F

B. 39.2°F

C.42°F

D. 4°F

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

A. outwards

B. inwards

C.in either way

D. none of these

26 Truth of kinetic energy is confirmed by:

A. Diffusion of gases

B. Brownian motion

C.Both A and B

D. None of these

27 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

28 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

29 Which of the following is not an assumption of kinetic energy

A. a finite volume of gas consists of very large number of molecules

B. the gas molecules are in random motion

C.collision between the gas molecules are inelastic

D. the size of the gas molecules is much smaller than the separation between molecules

30 The motion of molecules in gases is:

A. Orderly

B. Random

C.Circular

D. All of these

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