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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. Entropy change depends on

Mass transfer

Heat transfer

Change of temperature

Thermodynamic state

2. Temperature is a property which determines

How much total absolute energy a body has

How much heat a body contains

In which direction heat will flow between two systems

Whether a body will feel hot or cold to touch

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

Conduction

Neither, because the liquid cannot be heated in weightlessness

Convection

Radiation

4. 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 double

It would be four times as large

It would be ¼ as large

5. First law of thermodynamics deals with conservation of

Heat

Momentum

Mass

Energy

6. We can produce heat by

Chemical processes

Electrical processes

All of these

Frictional process

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

More than ½

Less than ½

Between 1 and 2

8. Good absorbers of heat are

Highly polarized

Good emitters

None emitters

Poor emitters

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

2.33 x 10¯⁵/°C

2.0 x 10¯⁵/°C

6.0 x 10¯⁵/°C

4.0 x 10¯⁵/°C

10. The value of Boltzman constant is

1.38 x 10¯²³ JK¯¹

1.38 x 10¯²⁸ JK¯¹

1.38 x 10¯²⁹ JK¯¹

1.28 x 10¯²² JK¯¹

11. 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’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 be transferred from low temperature to high temperature source if COP of process is more than unity

12. 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

13. Carnot cycle efficiency depends upon

Properties of the medium/substance used

Temperature range of operation

Effectiveness of insulating material around the engine

Condition of engine

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

Both a and b

Cyclic process

Operated at certain temperature difference

None of these

15. Pressure exerted by a gas is

Directly proportional to the square of the density of the gas

Inversely proportional to the density of the gas

Independent of density of the gas

Directly proportional to the density of the gas

16. We prefer mercury as a thermometric substance because

All of these

It opaque to light

It does not stick to thermometer glass

Over a wide range of temperature its expansion is uniform

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

None of these

Energy

Work

Heat

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

Transfer momentum to the walls

Perform Brownian motion

Move in opposite directions

Momentum becomes zero

19. At constant volume temperature is increased. Then

Collisions will not change

Number of collisions per unit time will increase

Collisions will be in straight lines

Collision on walls will be less

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

Low density

Low temperature

High pressure

High density

21. 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

22. 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 high thermal conductivity

Metal has low thermal conductivity

23. All changes which occur suddenly are irreversible through

All of these

Convection

Conduction

Radiation

24. Absolute temperature can be calculated by

Motion of the molecule

None of these

Mean square velocity

Both A and B

25. 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.

Page 2 of 4

26. 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

6.8 x 10³ J

3.4 x 10³ J

1.7 x 10³ J

27. Work done is zero for the following process

Free expansion

Constant volume

Throttling

None of the above

28. 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

10°C

17°C

0°C

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

Mass number

Atomic number

Number of moles

Number of molecules

30. 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

None of these

Second law of thermodynamics

31. 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

32. 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

-20°C

0°C

5°C

33. What does the m/l³ show?

Pressure

None of these

Density

Mass

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

Low specific heat and high conductivity

High specific heat and low conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

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

Zeroth law of thermodynamics

Second law of thermodynamics

None of these

First law of thermodynamics

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

Third law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

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

None of these

Very small

Small

Extremely small

38. Carnot cycle has maximum efficiency for

New engine

Petrol engine

Irreversible engine

Reversible engine

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

The above statement is invalid

Heat is use dup to increase internal energy

Heat is used by gas for expansions purposes at constant pressure

Heat is used up to increase temperature at constant pressure

40. Melting point of ice

Is proportional to pressure

Increases with increasing pressure

Is independent of pressure

Decreases with increasing pressure

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

Third law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

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

4.26%

5.26%

4.76%

43. 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

At constant T the pressure must be increased by four times

Temperature and pressure must be doubled

44. The relation of the adiabatic change is

PV² = constant

PV¯ᶜ = constant

PV = constant

PVᶜ = constant

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

Electromagnetic waves

Electrical wave

Magnetic wave

None of these

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

89%

11%

25%

50%

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

0°C and 0 torr

0 K and 760 torr

-273°C and 1 atm

0°C and 760 torr

48. Internal energy of a perfect gas depends upon

Temperature only

Temperature, pressure and specific heats

Temperature and pressure

None of these

49. The temperature of gas is produced by

The repulsive force between its molecules

At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

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

Boiling Point

None of these

Expansion Point

Melting point

Page 3 of 4

51. 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°C

627 K

255 K

81 K

52. 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

53. 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

54. According to first law of thermodynamics

None of these

Total energy of a system remains constant

Enthalpy entropy and total energy remains constant

Total energy of a system during a process remains constant

55. First law of thermodynamics is consequence of conservation of

Heat

All of these

Work

Energy

56. 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 more molecules bombard the container and so they must be moving slower

Remained constant if the compression is very slow

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

57. The relation between Cp and Cv is given by

Cp = Cv

None of these

Cp < Cv

Cp > Cv

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

Kinetic energy

Density

Potential energy

Vibrational energy

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

None of these

Semi conductors of heat

Insulators of heat

Conductors of heat

60. 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

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

Internal energy

Entropy

Temperature

Enthalpy

62. The main cause for the irreversibility is

Unrestricted expansion

Mechanical and fluid friction

Heat transfer with a finite temperature difference

All of the above

63. 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 >

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

-32°C

32°C

-212°C

-40°C

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

The temperatures of frozen and boiling mercury

The temperatures of ice cold and boiling water

The temperatures of melting ice and boiling water at atmospheric pressure

The temperatures of water at 0? 100? C

66. Heat travels through vacuum by

Radiation

Both A and B

Convection

Conduction

67. 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 second law of thermodynamics

Possible according to first law of thermodynamics

Impossible according to second law of thermodynamics

68. 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

69. For reversible adiabatic process, change in entropy is

Maximum

Minimum

Zero

Unpredictable

70. 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

71. 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

702°C

30.0°C

157°C

72. 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

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

Entropy

Thermal capacity

Specific heat

Water equivalent

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

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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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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Maan Ali

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