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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 efficiency of the Carnot cycle may be increased by

Increasing the lowest temperature

Decreasing the highest temperature

Increasing the highest temperature

Decreasing the lowest temperature

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

The temperatures of frozen and boiling mercury

The temperatures of water at 0? 100? C

The temperatures of melting ice and boiling water at atmospheric pressure

The temperatures of ice cold and boiling water

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

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

None of these

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

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

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

More than ½

Between 1 and 2

Less than ½

5. Internal energy of a perfect gas depends upon

Temperature only

Temperature, pressure and specific heats

Temperature and pressure

None of these

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

First law of thermodynamics

Zeroth law of thermodynamics

None of these

Second law of thermodynamics

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

Zero the law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

None of these

8. The main cause for the irreversibility is

Unrestricted expansion

Mechanical and fluid friction

All of the above

Heat transfer with a finite temperature difference

9. A cycle try bursts suddenly. This represents an

Isobaric process

Adiabatic process

Isochoric process

Isothermal process

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

More in the adiabatic process

Neither of them

Equal in both processes

11. 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

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

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

12. 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

13. Which is not example of adiabatic process?

Steam engine

Cloud formation

Passage of sound wave through air

Tyre burst

14. For reversible adiabatic process, change in entropy is

Maximum

Unpredictable

Minimum

Zero

15. Rice takes longest to cook

At sea level

In a submarina 100 m below the surface of the sea

At Mount Everest

At Murree

16. According to first law of thermodynamics

Enthalpy entropy and total energy remains constant

Total energy of a system during a process remains constant

None of these

Total energy of a system remains constant

17. We prefer mercury as a thermometric substance because

It does not stick to thermometer glass

Over a wide range of temperature its expansion is uniform

All of these

It opaque to light

18. 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 >

19. 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

6.67°C

5°C

0°C

20. Temperature is a property which determines

How much heat a body contains

How much total absolute energy a body has

Whether a body will feel hot or cold to touch

In which direction heat will flow between two systems

21. 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

22. Heat travels through vacuum by

Both A and B

Convection

Conduction

Radiation

23. Good absorbers of heat are

Poor emitters

None emitters

Highly polarized

Good emitters

24. We can produce heat by

All of these

Frictional process

Chemical processes

Electrical processes

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

Possible according to second law of thermodynamics

Impossible according to second law of thermodynamics

Possible according to first law of thermodynamics

Impossible according to first law of thermodynamics

Page 2 of 4

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

Momentum becomes zero

Transfer momentum to the walls

Move in opposite directions

Perform Brownian motion

27. 3 1 cal. = ?

1.2 joule

None of these

3.2 joule

4.2 joule

28. Absolute temperature can be calculated by

Mean square velocity

Both A and B

Motion of the molecule

None of these

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

Zero Kelvin

Critical temperature

Zero degree Celsius

Above critical temperature

30. Entropy change depends on

Change of temperature

Thermodynamic state

Heat transfer

Mass transfer

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

Heat capacity

None of these

Work capacity

Energy capacity

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

81 K

627 K

627°C

255 K

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

Very small

None of these

Extremely small

Small

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

Temperature and pressure must be doubled

At constant T the pressure must be increased by four times

It cannot be increased

At constant P the temperature must be increased by 4 times

35. Work done is zero for the following process

Free expansion

Throttling

Constant volume

None of the above

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

Neither, because the liquid cannot be heated in weightlessness

Convection

Conduction

Radiation

37. 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

38. 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 equal to that of B

A is greater than that of B

A is less than that of B

39. 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 not change.

The pressure will be 4 times as great.

The pressure will be 2 times as great.

40. 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

41. What does the m/l³ show?

Density

Mass

Pressure

None of these

42. 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

Heat is used up to increase temperature at constant pressure

The above statement is invalid

43. First law of thermodynamics is consequence of conservation of

Heat

Energy

All of these

Work

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

High specific heat and high conductivity

Low specific heat and low conductivity

Low specific heat and high conductivity

High specific heat and low conductivity

45. According to Clausis statement of second law of thermodynamics

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

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

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

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

46. First law of thermodynamic is special case of

Low of conservation of energy

Law of conservation of mass

Charle’s law

Boyle’s law

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

Atomic number

Number of molecules

Mass number

Number of moles

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

32°C

-212°C

-40°C

-32°C

49. The value of Boltzman constant is

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁹ JK¯¹

1.28 x 10¯²² JK¯¹

1.38 x 10¯²⁸ JK¯¹

50. 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

1 : 2

3 : 4

2 : 3

8 : 9

Page 3 of 4

51. Carnot cycle has maximum efficiency for

Petrol engine

Reversible engine

New engine

Irreversible engine

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

Becomes maximum

Becomes zero

Remain constant

Becomes minimum

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

0°C and 760 torr

0 K and 760 torr

0°C and 0 torr

-273°C and 1 atm

54. 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 four times as large

It would be half

It would be ¼ as large

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

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

56. At constant volume temperature is increased. Then

Collision on walls will be less

Collisions will be in straight lines

Collisions will not change

Number of collisions per unit time will increase

57. All changes which occur suddenly are irreversible through

Convection

Radiation

All of these

Conduction

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

4.26%

5.26%

4.76%

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

Energy

Work

None of these

Heat

60. 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.

61. First law of thermodynamics deals with conservation of

Mass

Energy

Heat

Momentum

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

1.8 degrees of Fahrenheit scale

2.12 degrees of Fahrenheit scale

One degree of Fahrenheit scale

3.2 degrees of Fahrenheit scale

63. Carnot cycle efficiency depends upon

Condition of engine

Temperature range of operation

Properties of the medium/substance used

Effectiveness of insulating material around the engine

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

Third law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

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

Entropy

Temperature

Internal energy

Enthalpy

66. Carnot cycle efficiency is maximum when

Difference between initial and final temperature is 0°K

Final temperature is 0°K

Initial temperature is 0°K

Final temperature is 0°C

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

Cyclic process

None of these

Both a and b

Operated at certain temperature difference

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

Magnetic wave

Electrical wave

None of these

Electromagnetic waves

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

89%

50%

25%

11%

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

Vibrational energy

Kinetic energy

Potential energy

Density

71. Melting point of ice

Decreases with increasing pressure

Increases with increasing pressure

Is proportional to pressure

Is independent of pressure

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

None of these

Boiling Point

Expansion Point

Melting point

73. 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

20°C

10°C

0°C

17°C

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

Metal has high specific heat

Metal has low specific heat

Metal has low thermal conductivity

Metal has high thermal conductivity

75. The temperature of gas is produced by

The repulsive force between its molecules

At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

Page 4 of 4

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

1.7 x 10³ J

10.2 x 10³ J

6.8 x 10³ J

3.4 x 10³ J

77. Internal energy per mole of gas depends on

Temperature

Thermal conductivity

Viscosity

Density

78. General gas equation is

= Constant

PV = mRT

PV = RT

PV = Constant

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

Move in opposite directions

Perform Brownian motion

Transfer momentum to the walls

Momentum becomes zero

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

Water equivalent

Specific heat

Entropy

Thermal capacity

81. The relation of the adiabatic change is

PV = constant

PVᶜ = constant

PV² = constant

PV¯ᶜ = constant

82. The relation between Cp and Cv is given by

Cp < Cv

None of these

Cp = Cv

Cp > Cv

83. An isolated system is one, which

Permits the passage of matter only

Permits the passage of energy only

Does not permit the passage of energy and matter across it

Permits the passage of energy and matter across the boundaries

84. 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

By unit degree of a substance

None of these

85. 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

4.0 x 10¯⁵/°C

6.0 x 10¯⁵/°C

2.0 x 10¯⁵/°C

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

High pressure

Low temperature

High density

Low density

87. Pressure exerted by a gas is

Inversely proportional to the density of the gas

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

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

Freeze

Boiled

Dissociated into O₂ and H₂

Evaporated

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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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