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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. Good absorbers of heat are

Good emitters

Poor emitters

Highly polarized

None emitters

2. 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

3. 3 1 cal. = ?

1.2 joule

3.2 joule

None of these

4.2 joule

4. Entropy change depends on

Mass transfer

Thermodynamic state

Heat transfer

Change of temperature

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

Kinetic energy

Vibrational energy

Potential energy

Density

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

Energy

Heat

None of these

Work

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

Atomic number

Number of moles

Number of molecules

Mass number

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

Conductors of heat

Insulators of heat

None of these

Semi conductors of heat

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

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

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

By unit degree of a substance

Of a unit mass by 10°

None of these

By unit degree of a unit mass

11. 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 be 2 times as great.

The pressure will be 5 times as great.

The pressure will not change.

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

None of these

Cyclic process

Both a and b

Operated at certain temperature difference

13. 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

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

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

Remained constant if the compression is very slow

14. 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

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

Zero Kelvin

Critical temperature

Above critical temperature

Zero degree Celsius

16. 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

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

255 K

81 K

627 K

627°C

18. First law of thermodynamic is special case of

Low of conservation of energy

Charle’s law

Law of conservation of mass

Boyle’s law

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

None of these

Energy capacity

Heat capacity

Work capacity

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

The temperatures of ice cold and boiling water

The temperatures of water at 0? 100? C

The temperatures of frozen and boiling mercury

The temperatures of melting ice and boiling water at atmospheric pressure

21. Rice takes longest to cook

At sea level

In a submarina 100 m below the surface of the sea

At Murree

At Mount Everest

22. 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

6.0 x 10¯⁵/°C

2.33 x 10¯⁵/°C

2.0 x 10¯⁵/°C

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

Low temperature

Low density

High density

High pressure

24. A cycle try bursts suddenly. This represents an

Isothermal process

Isochoric process

Isobaric process

Adiabatic process

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

None of these

Electrical wave

Magnetic wave

Electromagnetic waves

Page 2 of 4

26. 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

27. What does the m/l³ show?

Mass

Pressure

None of these

Density

28. 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

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

Transfer momentum to the walls

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

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

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

None of these

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

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

31. All changes which occur suddenly are irreversible through

All of these

Convection

Conduction

Radiation

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

Specific heat

Water equivalent

Thermal capacity

Entropy

33. 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?

430°C

157°C

702°C

30.0°C

34. 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

3.4 x 10³ J

6.8 x 10³ J

1.7 x 10³ J

35. Work done is zero for the following process

Free expansion

Constant volume

Throttling

None of the above

36. The temperature of gas is produced by

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

At potential energy of its molecules

37. 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

6.67°C

5°C

-20°C

0°C

38. 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 low conductivity

High specific heat and high conductivity

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

Convection

Conduction

Radiation

Neither, because the liquid cannot be heated in weightlessness

40. Carnot cycle efficiency depends upon

Condition of engine

Effectiveness of insulating material around the engine

Temperature range of operation

Properties of the medium/substance used

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

89%

11%

25%

50%

42. Carnot cycle efficiency is maximum when

Difference between initial and final temperature is 0°K

Initial temperature is 0°K

Final temperature is 0°C

Final temperature is 0°K

43. 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

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

One degree of Fahrenheit scale

3.2 degrees of Fahrenheit scale

1.8 degrees of Fahrenheit scale

2.12 degrees of Fahrenheit scale

45. 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

1 : 2

8 : 9

2 : 3

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

Transfer momentum to the walls

Perform Brownian motion

Momentum becomes zero

Move in opposite directions

47. Melting point of ice

Is independent of pressure

Is proportional to pressure

Decreases with increasing pressure

Increases with increasing pressure

48. 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

Possible according to first law of thermodynamics

Possible according to second law of thermodynamics

Impossible according to second law of thermodynamics

49. According to first law of thermodynamics

Total energy of a system remains constant

Total energy of a system during a process remains constant

None of these

Enthalpy entropy and total energy remains constant

50. 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 greater than that of B

A is twice the pressure of B

A is equal to that of B

Page 3 of 4

51. 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 >

52. For reversible adiabatic process, change in entropy is

Unpredictable

Minimum

Maximum

Zero

53. 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

0°C

17°C

10°C

54. An isolated system is one, which

Permits the passage of matter only

Does not permit the passage of energy and matter across it

Permits the passage of energy only

Permits the passage of energy and matter across the boundaries

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

-40°C

-32°C

32°C

-212°C

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

Decreasing the highest temperature

Increasing the highest temperature

Decreasing the lowest temperature

Increasing the lowest temperature

57. The relation between Cp and Cv is given by

None of these

Cp = Cv

Cp < Cv

Cp > Cv

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

Zeroth law of thermodynamics

First law of thermodynamics

None of these

Second law of thermodynamics

59. The main cause for the irreversibility is

All of the above

Mechanical and fluid friction

Heat transfer with a finite temperature difference

Unrestricted expansion

60. 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

61. Internal energy of a perfect gas depends upon

Temperature and pressure

Temperature, pressure and specific heats

None of these

Temperature only

62. We can produce heat by

Frictional process

Electrical processes

All of these

Chemical processes

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

Expansion Point

Melting point

Boiling Point

None of these

64. 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

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

Second law of thermodynamics

Zero the law of thermodynamics

First law of thermodynamics

None of these

66. The relation of the adiabatic change is

PV = constant

PV² = constant

PVᶜ = constant

PV¯ᶜ = constant

67. Which of the following is the correct statement?

All the reversible engines have the same efficiency

All the reversible and irreversible engines have the same efficiency

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

Irreversible engines have maximum efficiency

68. First law of thermodynamics is consequence of conservation of

Energy

Heat

All of these

Work

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

4.26%

5.26%

4.76%

70. Which is not example of adiabatic process?

Cloud formation

Tyre burst

Steam engine

Passage of sound wave through air

71. Which of the following statements is true?

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

All particles at the same temperature have the same kinetic energy

All particles having the same kinetic energy have the same mass

72. 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 up to increase temperature at constant pressure

The above statement is invalid

Heat is used by gas for expansions purposes at constant pressure

73. 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

74. We prefer mercury as a thermometric substance because

It does not stick to thermometer glass

All of these

It opaque to light

Over a wide range of temperature its expansion is uniform

75. Heat travels through vacuum by

Conduction

Convection

Both A and B

Radiation

Page 4 of 4

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

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

Third law of thermodynamics

77. 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 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

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

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

Remain constant

Becomes zero

Becomes minimum

Becomes maximum

79. Absolute temperature can be calculated by

Motion of the molecule

None of these

Both A and B

Mean square velocity

80. Carnot cycle has maximum efficiency for

Irreversible engine

New engine

Reversible engine

Petrol engine

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

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

Metal has high specific heat

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

Freeze

Evaporated

Dissociated into O₂ and H₂

Boiled

83. General gas equation is

PV = mRT

PV = RT

PV = Constant

= Constant

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

Small

None of these

Extremely small

Very small

85. 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

86. The value of Boltzman constant is

1.38 x 10¯²³ JK¯¹

1.28 x 10¯²² JK¯¹

1.38 x 10¯²⁸ JK¯¹

1.38 x 10¯²⁹ JK¯¹

87. First law of thermodynamics deals with conservation of

Heat

Mass

Energy

Momentum

88. Internal energy per mole of gas depends on

Viscosity

Thermal conductivity

Temperature

Density

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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

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Iqra says:

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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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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