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ECAT Physics Heat and Thermodynamics Online Test

Maan AliLast Updated: April 18, 2025

Physics Heat and Thermodynamics MCQS Online Test

ECAT Physics Heat and Thermodynamics Chapter Online Test

Total Questions:	88
Time Allowed:	40 Minutes
Total Marks:	88
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Heat and Thermodynamics Chapter Online Test

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Page 1 of 4

1. The temperature at which liquid changes into vapour is called as:

Melting point

None of these

Boiling Point

Expansion Point

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

Less than ½

More than ½

Between 1 and 2

3. For the measurement of thermodynamic property known as temperature, is based on

Third law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

4. The scales of temperature are based on two fixed points which are

The temperatures of melting ice and boiling water at atmospheric pressure

The temperatures of water at 0? 100? C

The temperatures of frozen and boiling mercury

The temperatures of ice cold and boiling water

5. Good absorbers of heat are

Poor emitters

Good emitters

None emitters

Highly polarized

6. If 4 moles of a gas are added to a container that already holds 1 mole of gas, how will the pressure change within the container? (Assume volume and temperature are constant.)

The pressure will be 2 times as great.

The pressure will not change.

The pressure will be 4 times as great.

The pressure will be 5 times as great.

7. At 0 K which of the following properties of a gas will be zero?

Vibrational energy

Potential energy

Density

Kinetic energy

8. Carnot cycle has maximum efficiency for

Irreversible engine

New engine

Petrol engine

Reversible engine

9. Work done is zero for the following process

Throttling

Free expansion

None of the above

Constant volume

10. On colliding in a closed container, the gas molecules

Momentum becomes zero

Transfer momentum to the walls

Perform Brownian motion

Move in opposite directions

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

Specific heat

Water equivalent

Entropy

Thermal capacity

12. Pressure exerted by a gas is

Inversely proportional to the density of the gas

Directly proportional to the density of the gas

Independent of density of the gas

Directly proportional to the square of the density of the gas

13. In an adiabatic change PVr=constant ‘ϒ’ is the ratio of specific heats

Molar sp. heat a constt, volume molar sp, heat at constt, pressure

Molar sp, heat at constt, volume Specific heat at constt. pressure

Specific heat at consst, Pressure Specific heat at constt, volume

None of these

14. The main cause for the irreversibility is

All of the above

Mechanical and fluid friction

Heat transfer with a finite temperature difference

Unrestricted expansion

15. A real gas can be approximated to an ideal gas at

Low temperature

High pressure

High density

Low density

16. An isolated system is one, which

Permits the passage of energy and matter across the boundaries

Permits the passage of energy only

Permits the passage of matter only

Does not permit the passage of energy and matter across it

17. When two bodies are in thermal equilibrium with a third body, they are also is thermal equilibrium with each other this statement is

None of these

First law of thermodynamics

Second law of thermodynamics

Zero the law of thermodynamics

18. The ideal efficiency for a heat engine operating between temperatures of 2950 K and 318 K is

50%

11%

25%

89%

19. Carnot cycle efficiency depends upon

Temperature range of operation

Effectiveness of insulating material around the engine

Condition of engine

Properties of the medium/substance used

20. We can produce heat by

Chemical processes

Electrical processes

All of these

Frictional process

21. For reversible adiabatic process, change in entropy is

Maximum

Zero

Unpredictable

Minimum

22. Radiation is the transfer of heat by means of:

Magnetic wave

None of these

Electrical wave

Electromagnetic waves

23. Absolute temperature can be calculated by

Motion of the molecule

Mean square velocity

Both A and B

None of these

24. If 3.0 L of helium at 20.0°C is allowed to expand to 4.4L, with the pressure remaining the same, what is the new temperature?

702°C

30.0°C

157°C

430°C

25. If the volume of a confined gas is doubled while the temperature remains constant, what change (if any) would be observed in the pressure?

It would be ¼ as large

It would be half

It would be four times as large

It would double

Page 2 of 4

26. 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 mixture will be:

R/2

Depending on the relative mass of the gases

27. 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

5°C

6.67°C

-20°C

0°C

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

-212°C

-40°C

32°C

-32°C

29. A fixed mass of gas in a thermally insulated container is compressed. After compression, the temperature of the gas will have

Fallen, since the molecules collide more frequently with one and so their average speed is lower

Fallen, since more molecules bombard the container and so they must be moving slower

Remained constant if the compression is very slow

Rise, since doing work on the gas increases the kinetic energy of the molecules.

30. The form of energy that produces feeling of hotness is called as:

Heat

None of these

Work

Energy

31. General gas equation is

PV = mRT

= Constant

PV = RT

PV = Constant

32. At constant volume temperature is increased. Then

Collision on walls will be less

Number of collisions per unit time will increase

Collisions will not change

Collisions will be in straight lines

33. The value of Boltzman constant is

1.28 x 10¯²² JK¯¹

1.38 x 10¯²⁸ JK¯¹

1.38 x 10¯²⁹ JK¯¹

1.38 x 10¯²³ JK¯¹

34. Internal energy of a perfect gas depends upon

Temperature, pressure and specific heats

Temperature only

Temperature and pressure

None of these

35. First law of thermodynamic is special case of

Boyle’s law

Charle’s law

Law of conservation of mass

Low of conservation of energy

36. The length of a metallic rod is 5 meter at 100°C. The coefficient of cubical expansion of the metal will be

2.0 x 10¯⁵/°C

2.33 x 10¯⁵/°C

4.0 x 10¯⁵/°C

6.0 x 10¯⁵/°C

37. Energy can neither be created not destroyed but only converted from one from to another. This statement is

None of these

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

38. Which of the following statements is true?

All particles moving with the same velocity have the same kinetic energy.

All particles having the same kinetic energy have the same mass

As the kinetic energy of a particle is halved, its velocity is also halved

All particles at the same temperature have the same kinetic energy

39. Pressure of gas is directly proportional to the average translational K.E. of the gas molecule.

P = 2/3 N/V < ½ mv² >

P = 2/3 V/N < ½ mv² >

P = 3/3 N//V < ½ mv² >

40. The relation of the adiabatic change is

PV = constant

PVᶜ = constant

PV¯ᶜ = constant

PV² = constant

41. First law of thermodynamics deals with conservation of

Energy

Momentum

Heat

Mass

42. All changes which occur suddenly are irreversible through

Conduction

All of these

Convection

Radiation

43. On a cold morning a metal surface will feel colder to touch than a wooden surface, because

Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

44. Temperature is a property which determines

How much heat a body contains

Whether a body will feel hot or cold to touch

How much total absolute energy a body has

In which direction heat will flow between two systems

45. A perpetual motion machine of the first kind is a machine which produces power without consuming any energy is

Impossible according to first law of thermodynamics

Possible according to first law of thermodynamics

Impossible according to second law of thermodynamics

Possible according to second law of thermodynamics

46. For the measurement of thermodynamics property known as temperature, is based on

Zeroth law of thermodynamics

Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

47. Melting point of ice

Decreases with increasing pressure

Increases with increasing pressure

Is proportional to pressure

Is independent of pressure

48. A gas at temperature of 27°C is heated at constant pressure to triple its volume. The final temperature of the gas will be

627°C

81 K

255 K

627 K

49. Rice takes longest to cook

At Mount Everest

In a submarina 100 m below the surface of the sea

At Murree

At sea level

50. Carnot cycle efficiency is maximum when

Initial temperature is 0°K

Final temperature is 0°C

Difference between initial and final temperature is 0°K

Final temperature is 0°K

Page 3 of 4

51. The coefficient of linear expansion of Iron is 0.000011 per °K. An iron rod is 10 meter long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

0°C

10°C

17°C

20°C

52. A cycle try bursts suddenly. This represents an

Isochoric process

Adiabatic process

Isothermal process

Isobaric process

53. First law of thermodynamics is consequence of conservation of

Heat

All of these

Work

Energy

54. Specific heat at constant pressure is greater than the specific heat at constant volume because

Heat is used by gas for expansions purposes at constant pressure

Heat is use dup to increase internal energy

The above statement is invalid

Heat is used up to increase temperature at constant pressure

55. At absolute temperature, the kinetic energy of the molecules

Becomes minimum

Remain constant

Becomes zero

Becomes maximum

56. In the relation n = PV/RT .n = ?

Number of molecules

Mass number

Atomic number

Number of moles

57. Internal energy per mole of gas depends on

Viscosity

Thermal conductivity

Temperature

Density

58. The materials which allow heat to pass through them easily are called as:

Insulators of heat

None of these

Conductors of heat

Semi conductors of heat

59. The temperature of gas is produced by

The attractive force between its molecules

The repulsive force between its molecules

At potential energy of its molecules

The kinetic energy of its molecules

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

Low specific heat and high conductivity

High specific heat and low conductivity

High specific heat and high conductivity

Low specific heat and low conductivity

61. According to first law of thermodynamics

Total energy of a system during a process remains constant

Total energy of a system remains constant

None of these

Enthalpy entropy and total energy remains constant

62. Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency

All the reversible engines have the same efficiency

Irreversible engines have maximum efficiency

All engines are designed as reversible in order to obtain maximum efficiency.

63. The size of one degree of Celsius is equal to

3.2 degrees of Fahrenheit scale

1.8 degrees of Fahrenheit scale

2.12 degrees of Fahrenheit scale

One degree of Fahrenheit scale

64. Heat travels through vacuum by

Conduction

Convection

Both A and B

Radiation

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

Above critical temperature

Critical temperature

Zero degree Celsius

Zero Kelvin

66. For the successful operation of Heat engine which conation should be met?

Operated at certain temperature difference

None of these

Both a and b

Cyclic process

67. The relation between Cp and Cv is given by

None of these

Cp = Cv

Cp > Cv

Cp < Cv

68. 3 1 cal. = ?

None of these

4.2 joule

1.2 joule

3.2 joule

69. At constant temperature, on increasing the pressure of a gas by 5%, its volume will decrease by

5.26%

4.76%

4.26%

70. The efficiency of the Carnot cycle may be increased by

Increasing the highest temperature

Decreasing the highest temperature

Decreasing the lowest temperature

Increasing the lowest temperature

71. What does the m/l³ show?

Pressure

Density

None of these

Mass

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

Neither, because the liquid cannot be heated in weightlessness

Convection

Conduction

Radiation

73. If water in a closed bottle is taken up to the moon and opened, the water gets

Freeze

Dissociated into O₂ and H₂

Boiled

Evaporated

74. Two identical samples of a gas are allowed to expand
i) isothermally Work done is
ii) adiabatically

Neither of them

7 Comments

Memoona fatiima says:

April 16, 2022 at 12:36 pm

Thank you so much for giving us these free test . These are so beneficial for students . I am glad to found this email and app .

Iqra says:

October 23, 2021 at 9:52 pm

nice mcqs with hardworking everyone should solve them

Iqra says:

October 23, 2021 at 9:50 pm

nice mcqs

Iqra says:

October 23, 2021 at 9:49 pm

if you work hard you will success

Iqra says:

October 23, 2021 at 9:48 pm

Inshallah I will rock

munahil says:

August 18, 2021 at 8:03 pm

well done.. please add more test related to heat

Khushbakht Kamal says:

September 8, 2020 at 5:08 pm

very helpful to me
sir sary chapters ky bad aisi hi mcqs lya kryn
sir you are a hardworker

ECAT Physics Heat and Thermodynamics Online Test

Physics Heat and Thermodynamics MCQS Online Test

ECAT Physics Heat and Thermodynamics Chapter Online Test

Physics Heat and Thermodynamics Chapter Online Test

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Maan Ali

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Physics Heat and Thermodynamics MCQS Online Test

ECAT Physics Heat and Thermodynamics Chapter Online Test

Physics Heat and Thermodynamics Chapter Online Test

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Maan Ali

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