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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

Neither of them

2. Internal energy of a perfect gas depends upon

None of these

Temperature, pressure and specific heats

Temperature and pressure

Temperature only

3. All changes which occur suddenly are irreversible through

All of these

Conduction

Radiation

Convection

4. 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

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

Internal energy

Temperature

Enthalpy

Entropy

6. Melting point of ice

Increases with increasing pressure

Decreases with increasing pressure

Is proportional to pressure

Is independent of pressure

7. Good absorbers of heat are

Good emitters

Highly polarized

Poor emitters

None emitters

8. Internal energy per mole of gas depends on

Thermal conductivity

Temperature

Viscosity

Density

9. Carnot cycle efficiency depends upon

Temperature range of operation

Properties of the medium/substance used

Effectiveness of insulating material around the engine

Condition of engine

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

Heat

Energy

None of these

Work

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

Becomes maximum

Remain constant

Becomes minimum

Becomes zero

12. First law of thermodynamics deals with conservation of

Heat

Mass

Energy

Momentum

13. 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

First law of thermodynamics

Second law of thermodynamics

None of these

14. The relation between Cp and Cv is given by

Cp > Cv

Cp = Cv

None of these

Cp < Cv

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

-212°C

-32°C

32°C

-40°C

16. We prefer mercury as a thermometric substance because

It opaque to light

All of these

Over a wide range of temperature its expansion is uniform

It does not stick to thermometer glass

17. Work done is zero for the following process

Free expansion

Throttling

None of the above

Constant volume

18. Heat travels through vacuum by

Conduction

Convection

Both A and B

Radiation

19. 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

255 K

81 K

627°C

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

Low specific heat and high conductivity

High specific heat and high conductivity

High specific heat and low conductivity

Low specific heat and low conductivity

21. Which of the following statements is true?

All particles at the same temperature have the same kinetic energy

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

All particles having the same kinetic energy have the same mass

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

22. 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 half

It would be ¼ as large

It would be four times as large

It would double

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

Melting point

None of these

Expansion Point

Boiling Point

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

3.2 degrees of Fahrenheit scale

One degree of Fahrenheit scale

1.8 degrees of Fahrenheit scale

2.12 degrees of Fahrenheit scale

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

50%

25%

11%

89%

Page 2 of 4

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

Move in opposite directions

Perform Brownian motion

Transfer momentum to the walls

Momentum becomes zero

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

None of these

By unit degree of a substance

Of a unit mass by 10°

By unit degree of a unit mass

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

Water equivalent

Entropy

Specific heat

Thermal capacity

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

Convection

Conduction

Neither, because the liquid cannot be heated in weightlessness

Radiation

30. The relation of the adiabatic change is

PV = constant

PV² = constant

PV¯ᶜ = constant

PVᶜ = constant

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

None of these

Conductors of heat

Semi conductors of heat

Insulators of heat

32. 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

33. Temperature is a property which determines

How much total absolute energy a body has

Whether a body will feel hot or cold to touch

How much heat a body contains

In which direction heat will flow between two systems

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

P = 2/3 V/N < ½ mv² >

P = 2/3 N/V < ½ mv² >

P = 3/3 N//V < ½ mv² >

35. First law of thermodynamics is consequence of conservation of

Heat

Energy

Work

All of these

36. 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 greater than that of B

A is equal to that of B

A is less than that of B

37. According to first law of thermodynamics

Total energy of a system during a process remains constant

None of these

Total energy of a system remains constant

Enthalpy entropy and total energy remains constant

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

Mass number

Number of moles

Atomic number

Number of molecules

39. 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

10°C

0°C

17°C

20°C

40. 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

41. Entropy change depends on

Change of temperature

Heat transfer

Thermodynamic state

Mass transfer

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

Between 1 and 2

More than ½

Less than ½

43. A cycle try bursts suddenly. This represents an

Isobaric process

Isothermal process

Adiabatic process

Isochoric process

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

Heat is used up to increase temperature at constant pressure

Heat is use dup to increase internal energy

Heat is used by gas for expansions purposes at constant pressure

The above statement is invalid

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

Work capacity

Energy capacity

None of these

Heat capacity

46. 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

0°C

-20°C

47. Carnot cycle has maximum efficiency for

Petrol engine

Reversible engine

New engine

Irreversible engine

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

Electrical wave

Magnetic wave

Electromagnetic waves

None of these

49. 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

50. 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

Page 3 of 4

51. What does the m/l³ show?

Mass

Pressure

Density

None of these

52. Which is not example of adiabatic process?

Steam engine

Passage of sound wave through air

Tyre burst

Cloud formation

53. General gas equation is

= Constant

PV = Constant

PV = mRT

PV = RT

54. 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

Impossible according to second law of thermodynamics

Possible according to second law of thermodynamics

Possible according to first law of thermodynamics

55. Pressure exerted by a gas is

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

Inversely proportional to the density of the gas

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

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

None of these

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

At constant P the temperature must be increased by 4 times

It cannot be increased

Temperature and pressure must be doubled

At constant T the pressure must be increased by four times

58. At constant volume temperature is increased. Then

Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

59. Rice takes longest to cook

At Murree

In a submarina 100 m below the surface of the sea

At sea level

At Mount Everest

60. 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

4.0 x 10¯⁵/°C

6.0 x 10¯⁵/°C

2.33 x 10¯⁵/°C

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

Kinetic energy

Vibrational energy

Potential energy

Density

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

The temperatures of water at 0? 100? C

The temperatures of ice cold and boiling water

The temperatures of melting ice and boiling water at atmospheric pressure

The temperatures of frozen and boiling mercury

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

None of these

Cyclic process

Operated at certain temperature difference

Both a and b

64. 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 be 5 times as great.

The pressure will be 4 times as great.

The pressure will not change.

65. 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

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

0 K and 760 torr

0°C and 760 torr

-273°C and 1 atm

0°C and 0 torr

67. 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?

30.0°C

157°C

430°C

702°C

68. The main cause for the irreversibility is

All of the above

Mechanical and fluid friction

Heat transfer with a finite temperature difference

Unrestricted expansion

69. Carnot cycle efficiency is maximum when

Final temperature is 0°K

Difference between initial and final temperature is 0°K

Final temperature is 0°C

Initial temperature is 0°K

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

Transfer momentum to the walls

Move in opposite directions

Perform Brownian motion

Momentum becomes zero

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

High density

Low density

High pressure

Low temperature

72. First law of thermodynamic is special case of

Low of conservation of energy

Law of conservation of mass

Boyle’s law

Charle’s law

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

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

First law of thermodynamics

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

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

Remained constant if the compression is very slow

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

75. For reversible adiabatic process, change in entropy is

Minimum

Maximum

Zero

Unpredictable

Page 4 of 4

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

Very small

Small

None of these

Extremely small

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

Decreasing the highest temperature

Decreasing the lowest temperature

Increasing the highest temperature

Increasing the lowest temperature

78. 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

8 : 9

2 : 3

3 : 4

1 : 2

79. Which of the following is the correct statement?

Irreversible engines have maximum efficiency

All the reversible and irreversible engines have the same efficiency

All the reversible engines have the same efficiency

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

80. The temperature of gas is produced by

The repulsive force between its molecules

The attractive force between its molecules

The kinetic energy of its molecules

At potential energy of its molecules

81. We can produce heat by

Electrical processes

Frictional process

Chemical processes

All of these

82. Absolute temperature can be calculated by

Both A and B

Motion of the molecule

None of these

Mean square velocity

83. 3 1 cal. = ?

3.2 joule

None of these

1.2 joule

4.2 joule

84. The value of Boltzman constant is

1.28 x 10¯²² JK¯¹

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁹ JK¯¹

1.38 x 10¯²⁸ JK¯¹

85. 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

None of these

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

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

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

Boiled

Evaporated

Dissociated into O₂ and H₂

Freeze

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

Above critical temperature

Critical temperature

Zero Kelvin

Zero degree Celsius

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

5.26%

4.26%

4.76%

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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

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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

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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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