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

More in the isothermal process

Equal in both processes

Neither of them

2. 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

A is twice the pressure of B

A is less than that of B

A is equal to that of B

A is greater than that of B

3. Pressure exerted by a gas is

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

Independent of density of the gas

Inversely proportional to the density of the gas

4. Good absorbers of heat are

Highly polarized

None emitters

Good emitters

Poor emitters

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

None of these

Both a and b

Operated at certain temperature difference

Cyclic process

6. If the volume of the gas is to be increased by 4 times, then

It cannot be increased

At constant T the pressure must be increased by four times

Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

7. 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 frozen and boiling mercury

The temperatures of ice cold and boiling water

The temperatures of water at 0? 100? C

8. According to Clausis statement of second law of thermodynamics

Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

Heat can’t be transferred from low temperature source to high temperature source

Heat can’t be transferred from low temperature to high temperature source without the aid of external energy

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle.

9. 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 double

It would be ¼ as large

It would be four times as large

It would be half

10. The amount of heat required to raise temperature of a substance by 1°C is called as:

None of these

Heat capacity

Work capacity

Energy capacity

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

None of these

First law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

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

5.26%

4.76%

4.26%

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

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

Conduction

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

Expansion Point

Boiling Point

Melting point

None of these

15. 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

16. 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 K

81 K

627°C

255 K

17. On colliding is a closed container, the gas molecules

Move in opposite directions

Momentum becomes zero

Transfer momentum to the walls

Perform Brownian motion

18. What does the m/l³ show?

Density

Mass

None of these

Pressure

19. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly

Temperature

Internal energy

Entropy

Enthalpy

20. A cycle try bursts suddenly. This represents an

Isochoric process

Isobaric process

Isothermal process

Adiabatic process

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

Possible according to first law of thermodynamics

Impossible according to second law of thermodynamics

Impossible according to first law of thermodynamics

Possible according to second law of thermodynamics

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

Remain constant

Becomes minimum

Becomes maximum

Becomes zero

23. Which is not example of adiabatic process?

Cloud formation

Passage of sound wave through air

Steam engine

Tyre burst

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

2.33 x 10¯⁵/°C

6.0 x 10¯⁵/°C

4.0 x 10¯⁵/°C

2.0 x 10¯⁵/°C

25. Internal energy of a perfect gas depends upon

Temperature, pressure and specific heats

None of these

Temperature only

Temperature and pressure

Page 2 of 4

26. Absolute temperature can be calculated by

Mean square velocity

Motion of the molecule

Both A and B

None of these

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

-20°C

5°C

6.67°C

0°C

28. Work done is zero for the following process

Free expansion

Constant volume

Throttling

None of the above

29. 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

17°C

0°C

20°C

10°C

30. Specific heat is the amount of heat required to raise the temperature

Of a unit mass by 10°

By unit degree of a unit mass

None of these

By unit degree of a substance

31. For reversible adiabatic process, change in entropy is

Minimum

Zero

Unpredictable

Maximum

32. We can produce heat by

Electrical processes

Chemical processes

All of these

Frictional process

33. General gas equation is

PV = mRT

= Constant

PV = Constant

PV = RT

34. Which of the following statements is true?

All particles at the same temperature have the same kinetic energy

All particles having the same kinetic energy have the same mass

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

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

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

Work

None of these

Energy

Heat

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

Potential energy

Density

Vibrational energy

Kinetic energy

37. The temperature of gas is produced by

The attractive force between its molecules

At potential energy of its molecules

The kinetic energy of its molecules

The repulsive force between its molecules

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

Magnetic wave

Electromagnetic waves

None of these

Electrical wave

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

Insulators of heat

Semi conductors of heat

None of these

Conductors of heat

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

P = 2/3 N/V < ½ mv² >

P = 3/3 N//V < ½ mv² >

P = 2/3 N/V < ½ mv² >

P = 2/3 V/N < ½ mv² >

41. An isolated system is one, which

Permits the passage of energy only

Does not permit the passage of energy and matter across it

Permits the passage of matter only

Permits the passage of energy and matter across the boundaries

42. Entropy change depends on

Thermodynamic state

Heat transfer

Mass transfer

Change of temperature

43. First law of thermodynamic is special case of

Charle’s law

Law of conservation of mass

Low of conservation of energy

Boyle’s law

44. We prefer mercury as a thermometric substance because

All of these

It opaque to light

Over a wide range of temperature its expansion is uniform

It does not stick to thermometer glass

45. Rice takes longest to cook

At Murree

In a submarina 100 m below the surface of the sea

At Mount Everest

At sea level

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

Above critical temperature

Critical temperature

Zero Kelvin

Zero degree Celsius

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

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

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

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

None of these

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

32°C

-212°C

-40°C

-32°C

49. 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

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

High specific heat and high conductivity

High specific heat and low conductivity

Low specific heat and low conductivity

Low specific heat and high conductivity

Page 3 of 4

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

11%

25%

89%

50%

52. Carnot cycle efficiency is maximum when

Final temperature is 0°K

Initial temperature is 0°K

Difference between initial and final temperature is 0°K

Final temperature is 0°C

53. The size of the molecule in comparison with the separation between the molecules is

Very small

Extremely small

None of these

Small

54. The value of Boltzman constant is

1.38 x 10¯²⁹ JK¯¹

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁸ JK¯¹

1.28 x 10¯²² JK¯¹

55. Carnot cycle efficiency depends upon

Properties of the medium/substance used

Temperature range of operation

Condition of engine

Effectiveness of insulating material around the engine

56. First law of thermodynamics is consequence of conservation of

Energy

All of these

Work

Heat

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

10.2 x 10³ J

1.7 x 10³ J

6.8 x 10³ J

3.4 x 10³ J

58. 3 1 cal. = ?

3.2 joule

None of these

1.2 joule

4.2 joule

59. All changes which occur suddenly are irreversible through

Convection

All of these

Radiation

Conduction

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

1.8 degrees of Fahrenheit scale

One degree of Fahrenheit scale

2.12 degrees of Fahrenheit scale

3.2 degrees of Fahrenheit scale

61. At constant volume temperature is increased. Then

Collisions will be in straight lines

Collisions will not change

Collision on walls will be less

Number of collisions per unit time will increase

62. 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?

157°C

30.0°C

702°C

430°C

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

Increasing the lowest temperature

Increasing the highest temperature

Decreasing the lowest temperature

Decreasing the highest temperature

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

Zeroth law of thermodynamics

Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

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

Remained constant if the compression is very slow

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

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

66. Heat travels through vacuum by

Convection

Both A and B

Conduction

Radiation

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

Boiled

Dissociated into O₂ and H₂

Freeze

Evaporated

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

Water equivalent

Entropy

Thermal capacity

Specific heat

69. The relation of the adiabatic change is

PV = constant

PV¯ᶜ = constant

PV² = constant

PVᶜ = constant

70. The relation between Cp and Cv is given by

Cp > Cv

Cp = Cv

None of these

Cp < Cv

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

Perform Brownian motion

Momentum becomes zero

Move in opposite directions

Transfer momentum to the walls

72. 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 5 times as great.

The pressure will be 2 times as great.

The pressure will not change.

The pressure will be 4 times as great.

73. 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

2 : 3

3 : 4

1 : 2

8 : 9

74. First law of thermodynamics deals with conservation of

Mass

Heat

Momentum

Energy

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

Metal has high thermal conductivity

Metal has high specific heat

Metal has low thermal conductivity

Metal has low specific heat

Page 4 of 4

76. According to first law of thermodynamics

Enthalpy entropy and total energy remains constant

Total energy of a system remains constant

Total energy of a system during a process remains constant

None of these

77. 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:

Depending on the relative mass of the gases

R/2

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

Atomic number

Mass number

Number of molecules

Number of moles

79. Temperature is a property which determines

In which direction heat will flow between two systems

How much total absolute energy a body has

How much heat a body contains

Whether a body will feel hot or cold to touch

80. What are standard temperature and pressure conditions for gases?

0 K and 760 torr

-273°C and 1 atm

0°C and 0 torr

0°C and 760 torr

81. The main cause for the irreversibility is

Mechanical and fluid friction

Unrestricted expansion

All of the above

Heat transfer with a finite temperature difference

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

First law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

Third law of thermodynamics

83. Melting point of ice

Increases with increasing pressure

Is independent of pressure

Is proportional to pressure

Decreases with increasing pressure

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

The above statement is invalid

Heat is use dup to increase internal energy

Heat is used up to increase temperature at constant pressure

Heat is used by gas for expansions purposes at constant pressure

85. Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency

Irreversible engines have maximum efficiency

All the reversible engines have the same efficiency

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

86. Carnot cycle has maximum efficiency for

Irreversible engine

Reversible engine

New engine

Petrol engine

87. Internal energy per mole of gas depends on

Density

Viscosity

Thermal conductivity

Temperature

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

Low temperature

Low density

High density

High pressure

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Maan AliLast Updated: April 18, 2025

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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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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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