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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. Heat travels through vacuum by

Conduction

Both A and B

Convection

Radiation

2. Pressure exerted by a gas is

Independent of density of the gas

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

3. 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

4. Carnot cycle has maximum efficiency for

New engine

Irreversible engine

Reversible engine

Petrol engine

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

Low density

High density

Low temperature

High pressure

6. Carnot cycle efficiency depends upon

Temperature range of operation

Condition of engine

Properties of the medium/substance used

Effectiveness of insulating material around the engine

7. Internal energy per mole of gas depends on

Viscosity

Thermal conductivity

Temperature

Density

8. All changes which occur suddenly are irreversible through

Radiation

Conduction

Convection

All of these

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

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.

Remained constant if the compression is very slow

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

10. Carnot cycle efficiency is maximum when

Difference between initial and final temperature is 0°K

Initial temperature is 0°K

Final temperature is 0°K

Final temperature is 0°C

11. 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 >

12. 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

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

Mass number

Number of moles

Atomic number

Number of molecules

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

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

The temperatures of frozen and boiling mercury

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

None of these

Magnetic wave

Electromagnetic waves

Electrical wave

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

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

Transfer momentum to the walls

17. For reversible adiabatic process, change in entropy is

Minimum

Maximum

Unpredictable

Zero

18. First law of thermodynamic is special case of

Charle’s law

Low of conservation of energy

Law of conservation of mass

Boyle’s law

19. 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

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

Metal has low specific heat

Metal has high thermal conductivity

Metal has low thermal conductivity

Metal has high specific heat

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

Low specific heat and low conductivity

High specific heat and high conductivity

Low specific heat and high conductivity

High specific heat and low conductivity

22. Which is not example of adiabatic process?

Tyre burst

Steam engine

Passage of sound wave through air

Cloud formation

23. What does the m/l³ show?

None of these

Density

Pressure

Mass

24. 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

3.4 x 10³ J

10.2 x 10³ J

6.8 x 10³ J

25. We prefer mercury as a thermometric substance because

All of these

It does not stick to thermometer glass

Over a wide range of temperature its expansion is uniform

It opaque to light

Page 2 of 4

26. Good absorbers of heat are

Poor emitters

None emitters

Good emitters

Highly polarized

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

0°C

5°C

-20°C

6.67°C

28. An isolated system is one, which

Permits the passage of matter only

Permits the passage of energy and matter across the boundaries

Does not permit the passage of energy and matter across it

Permits the passage of energy only

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. The efficiency of the Carnot cycle may be increased by

Decreasing the highest temperature

Decreasing the lowest temperature

Increasing the lowest temperature

Increasing the highest temperature

31. Internal energy of a perfect gas depends upon

Temperature and pressure

None of these

Temperature, pressure and specific heats

Temperature only

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

627 K

627°C

81 K

255 K

33. 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

34. Melting point of ice

Decreases with increasing pressure

Is independent of pressure

Increases with increasing pressure

Is proportional to pressure

35. At constant volume temperature is increased. Then

Number of collisions per unit time will increase

Collisions will be in straight lines

Collision on walls will be less

Collisions will not change

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

First law of thermodynamics

None of these

Second law of thermodynamics

Zeroth law of thermodynamics

37. Entropy change depends on

Mass transfer

Change of temperature

Thermodynamic state

Heat transfer

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

4.0 x 10¯⁵/°C

2.0 x 10¯⁵/°C

2.33 x 10¯⁵/°C

6.0 x 10¯⁵/°C

39. Work done is zero for the following process

Throttling

Free expansion

None of the above

Constant volume

40. 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

30.0°C

157°C

41. Temperature is a property which determines

How much total absolute energy a body has

How much heat a body contains

Whether a body will feel hot or cold to touch

In which direction heat will flow between two systems

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

Extremely small

None of these

Small

Very small

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

Evaporated

Freeze

Dissociated into O₂ and H₂

Boiled

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

Equal in both processes

More in the isothermal process

Neither of them

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

Convection

Conduction

Neither, because the liquid cannot be heated in weightlessness

Radiation

46. 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

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

-273°C and 1 atm

0 K and 760 torr

0°C and 0 torr

0°C and 760 torr

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

Vibrational energy

Kinetic energy

Potential energy

Density

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

Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

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

-40°C

32°C

-32°C

-212°C

Page 3 of 4

51. Absolute temperature can be calculated by

Motion of the molecule

None of these

Mean square velocity

Both A and B

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

Boiling Point

Expansion Point

None of these

Melting point

53. According to Clausis statement of second law of thermodynamics

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

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 source to high temperature source

54. We can produce heat by

Electrical processes

All of these

Frictional process

Chemical processes

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

25%

89%

50%

11%

56. First law of thermodynamics deals with conservation of

Heat

Momentum

Mass

Energy

57. Which of the following is the correct statement?

All the reversible engines have the same efficiency

Irreversible engines have maximum efficiency

All the reversible and irreversible engines have the same efficiency

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

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

Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

It cannot be increased

At constant T the pressure must be increased by four times

59. A cycle try bursts suddenly. This represents an

Isothermal process

Isochoric process

Isobaric process

Adiabatic process

60. The main cause for the irreversibility is

All of the above

Mechanical and fluid friction

Heat transfer with a finite temperature difference

Unrestricted expansion

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

Entropy

Water equivalent

Specific heat

Thermal capacity

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

Second law of thermodynamics

Zeroth law of thermodynamics

First law of thermodynamics

Third law of thermodynamics

63. 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

2 : 3

8 : 9

1 : 2

64. According to first law of thermodynamics

Enthalpy entropy and total energy remains constant

Total energy of a system remains constant

None of these

Total energy of a system during a process remains constant

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

Second law of thermodynamics

First law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

66. 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 used up to increase temperature at constant pressure

The above statement is invalid

Heat is use dup to increase internal energy

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

None of these

Heat

Work

Energy

68. The relation between Cp and Cv is given by

None of these

Cp > Cv

Cp = Cv

Cp < Cv

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

Becomes maximum

Remain constant

Becomes zero

Becomes minimum

70. 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 four times as large

It would be ¼ as large

It would double

It would be half

71. General gas equation is

= Constant

PV = mRT

PV = Constant

PV = RT

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

4.26%

4.76%

5.26%

73. Rice takes longest to cook

At sea level

In a submarina 100 m below the surface of the sea

At Murree

At Mount Everest

74. 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

75. Which of the following statements is true?

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.

All particles at the same temperature have the same kinetic energy

Page 4 of 4

76. 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.

77. 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

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

Conductors of heat

Insulators of heat

Semi conductors of heat

None of these

79. The relation of the adiabatic change is

PVᶜ = constant

PV¯ᶜ = constant

PV = constant

PV² = constant

80. First law of thermodynamics is consequence of conservation of

All of these

Heat

Energy

Work

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

Perform Brownian motion

Move in opposite directions

Momentum becomes zero

Transfer momentum to the walls

82. 3 1 cal. = ?

4.2 joule

1.2 joule

3.2 joule

None of these

83. 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

84. 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 less than that of B

A is equal to that of B

A is twice the pressure of B

A is greater than that of B

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

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

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

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

None of these

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

None of these

Work capacity

Energy capacity

Heat capacity

87. 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

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

Enthalpy

Temperature

Internal energy

Entropy

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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

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Khushbakht Kamal says:

September 8, 2020 at 5:08 pm

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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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