Home/ECAT/ECAT Physics Heat and Thermodynamics Online Test

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.
Test Helpful For:	ECAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

Physics Heat and Thermodynamics Chapter Online Test

Page 1 of 4

1. 3 1 cal. = ?

4.2 joule

1.2 joule

3.2 joule

None of these

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

P = 2/3 N/V < ½ mv² >

P = 2/3 V/N < ½ mv² >

P = 3/3 N//V < ½ mv² >

P = 2/3 N/V < ½ mv² >

3. Which is not example of adiabatic process?

Cloud formation

Steam engine

Tyre burst

Passage of sound wave through air

4. Good absorbers of heat are

Poor emitters

None emitters

Highly polarized

Good emitters

5. 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

2 : 3

8 : 9

1 : 2

3 : 4

6. Pressure exerted by a gas is

Inversely proportional to the density of the gas

Directly proportional to the density of the gas

Directly proportional to the square of the density of the gas

Independent of density of the gas

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

Electromagnetic waves

None of these

Magnetic wave

Electrical wave

8. 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 frozen and boiling mercury

The temperatures of melting ice and boiling water at atmospheric pressure

9. Internal energy per mole of gas depends on

Density

Temperature

Thermal conductivity

Viscosity

10. For reversible adiabatic process, change in entropy is

Maximum

Zero

Unpredictable

Minimum

11. All changes which occur suddenly are irreversible through

Conduction

Convection

All of these

Radiation

12. 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

0°C

5°C

-20°C

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

Zeroth law of thermodynamics

None of these

Second law of thermodynamics

First law of thermodynamics

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

Mass number

Number of molecules

Number of moles

Atomic number

15. Carnot cycle efficiency depends upon

Condition of engine

Properties of the medium/substance used

Effectiveness of insulating material around the engine

Temperature range of operation

16. 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

255 K

627°C

17. Entropy change depends on

Heat transfer

Change of temperature

Thermodynamic state

Mass transfer

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

Metal has low specific heat

Metal has low thermal conductivity

Metal has high specific heat

Metal has high thermal conductivity

19. According to first law of thermodynamics

None of these

Total energy of a system during a process remains constant

Total energy of a system remains constant

Enthalpy entropy and total energy remains constant

20. 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

21. 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 not change.

The pressure will be 4 times as great.

The pressure will be 5 times as great.

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

None of these

Expansion Point

Boiling Point

Melting point

23. 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

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

Potential energy

Kinetic energy

Density

Vibrational energy

25. 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

Page 2 of 4

26. 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

27. We can produce heat by

All of these

Electrical processes

Chemical processes

Frictional process

28. Heat travels through vacuum by

Both A and B

Conduction

Convection

Radiation

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

Impossible according to second law of thermodynamics

Impossible according to first law of thermodynamics

Possible according to second law of thermodynamics

Possible according to first law of thermodynamics

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

First law of thermodynamics

None of these

Second law of thermodynamics

Zero the law of thermodynamics

31. 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

32. The temperature of gas is produced by

The attractive force between its molecules

The kinetic energy of its molecules

At potential energy of its molecules

The repulsive force between its molecules

33. An isolated system is one, which

Permits the passage of energy and matter across the boundaries

Permits the passage of energy only

Does not permit the passage of energy and matter across it

Permits the passage of matter only

34. Melting point of ice

Increases with increasing pressure

Decreases with increasing pressure

Is proportional to pressure

Is independent of pressure

35. The relation of the adiabatic change is

PV = constant

PV² = constant

PVᶜ = constant

PV¯ᶜ = constant

36. 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?

157°C

430°C

702°C

30.0°C

37. At constant volume temperature is increased. Then

Number of collisions per unit time will increase

Collisions will not change

Collision on walls will be less

Collisions will be in straight lines

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

Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

39. Internal energy of a perfect gas depends upon

Temperature, pressure and specific heats

Temperature and pressure

Temperature only

None of these

40. First law of thermodynamics is consequence of conservation of

Energy

Heat

Work

All of these

41. Which of the following statements is true?

All particles at the same temperature have the same kinetic energy

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

All particles having the same kinetic energy have the same mass

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

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

Insulators of heat

Semi conductors of heat

Conductors of heat

None of these

43. What does the m/l³ show?

Mass

None of these

Density

Pressure

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

Small

Very small

None of these

Extremely small

45. 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 be half

It would be four times as large

It would double

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

High density

Low temperature

Low density

High pressure

47. The value of Boltzman constant is

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁸ JK¯¹

1.28 x 10¯²² JK¯¹

1.38 x 10¯²⁹ JK¯¹

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

Freeze

Evaporated

Boiled

Dissociated into O₂ and H₂

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

Entropy

Specific heat

Thermal capacity

Water equivalent

50. The main cause for the irreversibility is

All of the above

Heat transfer with a finite temperature difference

Mechanical and fluid friction

Unrestricted expansion

Page 3 of 4

51. Rice takes longest to cook

In a submarina 100 m below the surface of the sea

At Mount Everest

At Murree

At sea level

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

Temperature and pressure must be doubled

It cannot be increased

At constant T the pressure must be increased by four times

At constant P the temperature must be increased by 4 times

53. A cycle try bursts suddenly. This represents an

Isobaric process

Adiabatic process

Isochoric process

Isothermal process

54. 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.

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

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

Conduction

Radiation

Convection

Neither, because the liquid cannot be heated in weightlessness

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

Cyclic process

Both a and b

Operated at certain temperature difference

None of these

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

Becomes zero

Becomes minimum

Remain constant

Becomes maximum

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

-32°C

-212°C

32°C

-40°C

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

5.26%

4.76%

4.26%

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

Perform Brownian motion

Momentum becomes zero

Move in opposite directions

Transfer momentum to the walls

61. 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

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

Momentum becomes zero

Move in opposite directions

Transfer momentum to the walls

Perform Brownian motion

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

0°C and 0 torr

0°C and 760 torr

-273°C and 1 atm

0 K and 760 torr

64. 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 less than that of B

A is equal to that of B

A is greater than that of B

65. 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

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

Heat is use dup to increase internal energy

The above statement is invalid

67. Which of the following is the correct statement?

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

Irreversible engines have maximum efficiency

All the reversible engines have the same efficiency

All the reversible and irreversible engines have the same efficiency

68. 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

10°C

0°C

20°C

69. The relation between Cp and Cv is given by

Cp > Cv

Cp = Cv

None of these

Cp < Cv

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

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

71. First law of thermodynamics deals with conservation of

Momentum

Mass

Heat

Energy

72. We prefer mercury as a thermometric substance because

It opaque to light

All of these

It does not stick to thermometer glass

Over a wide range of temperature its expansion is uniform

73. 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

2.0 x 10¯⁵/°C

2.33 x 10¯⁵/°C

74. General gas equation is

PV = Constant

PV = mRT

PV = RT

= Constant

75. 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

Page 4 of 4

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

High specific heat and low conductivity

Low specific heat and high conductivity

High specific heat and high conductivity

Low specific heat and low conductivity

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

Temperature

Internal energy

Entropy

Enthalpy

78. Carnot cycle efficiency is maximum when

Final temperature is 0°C

Initial temperature is 0°K

Final temperature is 0°K

Difference between initial and final temperature is 0°K

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

2.12 degrees of Fahrenheit scale

1.8 degrees of Fahrenheit scale

One degree of Fahrenheit scale

3.2 degrees of Fahrenheit scale

80. Absolute temperature can be calculated by

Both A and B

Motion of the molecule

None of these

Mean square velocity

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

89%

50%

11%

25%

82. First law of thermodynamic is special case of

Boyle’s law

Charle’s law

Law of conservation of mass

Low of conservation of energy

83. Work done is zero for the following process

Constant volume

Throttling

None of the above

Free expansion

84. 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

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

None of these

Heat

Energy

Work

86. 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

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

3.4 x 10³ J

6.8 x 10³ J

10.2 x 10³ J

1.7 x 10³ J

88. Carnot cycle has maximum efficiency for

Petrol engine

Reversible engine

Irreversible engine

New engine

You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.

ECAT Chemistry Environmental Chemistry Test Online
ECAT Chemistry Common Chemical Industries in Pakistan Test O...
ECAT Chemistry Macro-Molecules Test Online
ECAT Chemistry Carboxylic Acid Test Online
ECAT Chemistry Aldehydes and Ketones Test Online
ECAT Chemistry Alcohols Phenols And Ethers Test Online
ECAT Chemistry Alkyl Halides Test Online
ECAT Chemistry Aromatic Hydrocarbons Test Online
ECAT Chemistry Aliphatic Hydrocarbons Test Online
ECAT Chemistry Fundamental Principles of Organic Chemistry T...

Maan AliLast Updated: April 18, 2025

Facebook Twitter Reddit WhatsApp Share via Email Print

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

You Might Also Like

Maan Ali

7 Comments

Leave a Reply Cancel reply

Physics Heat and Thermodynamics MCQS Online Test

ECAT Physics Heat and Thermodynamics Chapter Online Test

Physics Heat and Thermodynamics Chapter Online Test

You Might Also Like

Maan Ali

Your Related

UET Peshawar Entry Test 2025 Registration Online ETEA Test Dates

UET Lahore, Taxila ECAT Maths Entry Test Online Preparation

ECAT Mathematics Sequences and Series Online Test

ECAT Physics Measurements Test Online

Mehran University Sindh ECAT Maths Entry Test Online Preparation

ECAT Mathematics Permutations Combinations and Probability Online Test

7 Comments

Leave a Reply Cancel reply