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

32°C

-40°C

-32°C

-212°C

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

Water equivalent

Specific heat

Thermal capacity

Entropy

3. 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.

4. A cycle try bursts suddenly. This represents an

Isochoric process

Isothermal process

Isobaric process

Adiabatic process

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

6.8 x 10³ J

3.4 x 10³ J

1.7 x 10³ J

10.2 x 10³ J

6. The temperature of gas is produced by

The attractive force between its molecules

The kinetic energy of its molecules

The repulsive force between its molecules

At potential energy of its molecules

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

5.26%

4.76%

4.26%

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

Low specific heat and low conductivity

Low specific heat and high conductivity

High specific heat and high conductivity

High specific heat and low conductivity

9. 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

10. Work done is zero for the following process

None of the above

Free expansion

Throttling

Constant volume

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

Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

12. First law of thermodynamics deals with conservation of

Momentum

Mass

Heat

Energy

13. 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

14. 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

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

Neither of them

Equal in both processes

More in the isothermal process

16. An isolated system is one, which

Does not permit the passage of energy and matter across it

Permits the passage of matter only

Permits the passage of energy only

Permits the passage of energy and matter across the boundaries

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

By unit degree of a unit mass

By unit degree of a substance

Of a unit mass by 10°

None of these

18. The value of Boltzman constant is

1.38 x 10¯²⁸ JK¯¹

1.28 x 10¯²² JK¯¹

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁹ JK¯¹

19. Rice takes longest to cook

At sea level

At Murree

In a submarina 100 m below the surface of the sea

At Mount Everest

20. Melting point of ice

Is independent of pressure

Is proportional to pressure

Decreases with increasing pressure

Increases with increasing pressure

21. Heat travels through vacuum by

Conduction

Convection

Both A and B

Radiation

22. Carnot cycle has maximum efficiency for

Petrol engine

Reversible engine

New engine

Irreversible engine

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

Move in opposite directions

Transfer momentum to the walls

Perform Brownian motion

Momentum becomes zero

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

None of these

Heat capacity

Energy capacity

Work capacity

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

Melting point

None of these

Boiling Point

Expansion Point

Page 2 of 4

26. Entropy change depends on

Heat transfer

Change of temperature

Thermodynamic state

Mass transfer

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

Electrical wave

Electromagnetic waves

None of these

Magnetic wave

28. 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

3 : 4

8 : 9

1 : 2

2 : 3

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

High density

High pressure

Low temperature

Low density

30. Which of the following statements is true?

All particles having the same kinetic energy have the same mass

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

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

31. Which of the following is the correct statement?

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

All the reversible engines have the same efficiency

Irreversible engines have maximum efficiency

All the reversible and irreversible engines have the same efficiency

32. At constant volume temperature is increased. Then

Number of collisions per unit time will increase

Collisions will not change

Collisions will be in straight lines

Collision on walls will be less

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

Transfer momentum to the walls

Move in opposite directions

Perform Brownian motion

Momentum becomes zero

34. The relation between Cp and Cv is given by

Cp = Cv

Cp < Cv

None of these

Cp > Cv

35. 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

430°C

157°C

30.0°C

36. What does the m/l³ show?

Density

Mass

None of these

Pressure

37. 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

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

11%

89%

50%

25%

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

Small

Extremely small

Very small

None of these

40. Internal energy of a perfect gas depends upon

Temperature only

Temperature, pressure and specific heats

None of these

Temperature and pressure

41. 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 less than that of B

A is greater than that of B

42. 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

Possible according to first law of thermodynamics

Impossible according to second law of thermodynamics

Impossible according to first law of thermodynamics

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

Number of molecules

Atomic number

Mass number

Number of moles

44. 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

45. Internal energy per mole of gas depends on

Viscosity

Thermal conductivity

Density

Temperature

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

Potential energy

Kinetic energy

Vibrational energy

Density

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

First law of thermodynamics

Third law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

48. For reversible adiabatic process, change in entropy is

Minimum

Maximum

Unpredictable

Zero

49. 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

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

Heat is use dup to increase internal energy

Heat is used by gas for expansions purposes at constant pressure

The above statement is invalid

Heat is used up to increase temperature at constant pressure

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. 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

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

Both a and b

Operated at certain temperature difference

Cyclic process

None of these

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

Zero degree Celsius

Zero Kelvin

Above critical temperature

Critical temperature

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

Decreasing the highest temperature

Increasing the lowest temperature

Decreasing the lowest temperature

Increasing the highest temperature

56. 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

57. First law of thermodynamic is special case of

Boyle’s law

Law of conservation of mass

Charle’s law

Low of conservation of energy

58. General gas equation is

PV = mRT

PV = Constant

PV = RT

= Constant

59. The relation of the adiabatic change is

PV = constant

PV¯ᶜ = constant

PV² = constant

PVᶜ = constant

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

At constant T the pressure must be increased by four times

At constant P the temperature must be increased by 4 times

It cannot be increased

Temperature and pressure must be doubled

61. 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 4 times as great.

The pressure will not change.

The pressure will be 5 times as great.

The pressure will be 2 times as great.

62. We can produce heat by

Chemical processes

All of these

Frictional process

Electrical processes

63. 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 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

64. Carnot cycle efficiency is maximum when

Initial temperature is 0°K

Difference between initial and final temperature is 0°K

Final temperature is 0°C

Final temperature is 0°K

65. First law of thermodynamics is consequence of conservation of

Work

Heat

Energy

All of these

66. 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

255 K

627 K

627°C

67. 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 V/N < ½ mv² >

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

Entropy

Internal energy

Enthalpy

Temperature

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

Heat

Energy

Work

None of these

70. 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

71. 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

None of these

First law of thermodynamics

Second law of thermodynamics

72. Absolute temperature can be calculated by

None of these

Motion of the molecule

Both A and B

Mean square velocity

73. 3 1 cal. = ?

3.2 joule

None of these

1.2 joule

4.2 joule

74. 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

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

Remain constant

Becomes maximum

Becomes zero

Becomes minimum

Page 4 of 4

76. Good absorbers of heat are

Highly polarized

Good emitters

None emitters

Poor emitters

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

Radiation

Conduction

Neither, because the liquid cannot be heated in weightlessness

Convection

78. The main cause for the irreversibility is

Heat transfer with a finite temperature difference

Unrestricted expansion

Mechanical and fluid friction

All of the above

79. According to first law of thermodynamics

Total energy of a system remains constant

Enthalpy entropy and total energy remains constant

None of these

Total energy of a system during a process remains constant

80. All changes which occur suddenly are irreversible through

Convection

Radiation

Conduction

All of these

81. 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 double

It would be four times as large

It would be half

82. Carnot cycle efficiency depends upon

Effectiveness of insulating material around the engine

Condition of engine

Temperature range of operation

Properties of the medium/substance used

83. 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

84. Which is not example of adiabatic process?

Tyre burst

Passage of sound wave through air

Steam engine

Cloud formation

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

Dissociated into O₂ and H₂

Boiled

Evaporated

Freeze

86. 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

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

0 K and 760 torr

-273°C and 1 atm

0°C and 760 torr

0°C and 0 torr

88. 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

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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

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Iqra says:

October 23, 2021 at 9:50 pm

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October 23, 2021 at 9:49 pm

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Iqra says:

October 23, 2021 at 9:48 pm

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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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