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JEE • PHYSICS • THERMAL PROPERTIES OF MATTER

Thermal properties of matter practice · Medium

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 514 questions

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1 Medium

1 of 514

Remembering +4 | -1

In the relation

n = \frac{{PV}}{{RT}},n =

View answer and explanation

Correct option: D

Number of Moles

Option D (Number of Moles) is correct because in the ideal gas law equation, 'n' represents the number of moles.

2 Medium

2 of 514

Understanding +4 | -1

Mud houses are cooler in summer and warmer in winter because

View answer and explanation

Correct option: C

Mud is bad conductor of heat

Option C (Mud is bad conductor of heat) is correct because mud's poor conductivity prevents heat transfer, keeping houses cooler in summer and warmer in winter.

3 Medium

3 of 514

Understanding +4 | -1

Which of the following statements is correct?

View answer and explanation

Correct option: D

When fully inflated balloon is immersed in cold water, it will contract

Option D (When fully inflated balloon is immersed in cold water, it will contract) is correct because cooling the air inside the balloon reduces its volume.

4 Medium

4 of 514

Application +4 | -1

300 gm of water at

{25^0}

is added to 100 g of ice at

{0^0}C

. The final temperature of the mixture is

View answer and explanation

Correct option: D

{0^0}C

Option D (

{0^0}C

) is correct because the heat released by the water cooling down to 0°C is not enough to melt all the ice, so the final temperature is 0°C.

5 Medium

5 of 514

Application +4 | -1

A black body radiates energy at the rate of

E\,\,W{m^{ - 2}}

at a high temperature T K. When the temperature is reduced to

\left( {\frac{T}{2}} \right)K

the radiant energy is

View answer and explanation

Correct option: D

\frac{E}{16}

Option D (

\frac{E}{16}

) is correct because according to Stefan's law, the radiant energy is proportional to the fourth power of the temperature, so when the temperature is halved, the energy becomes 1/16th.

6 Medium

6 of 514

Remembering +4 | -1

A perfectly black body has absorptivity a equal to

View answer and explanation

Correct option: D

a=1

Option D (

a=1

) is correct because a perfectly black body absorbs all incident radiation, meaning its absorptivity is 1.

7 Medium

7 of 514

Application +4 | -1

Suppose that one early morning when the temperature is

10^{\circ} \mathrm{C}

, a driver of an automobile gets his gasoline tank which is made of steel, filled with 75 litre of gasoline, which is also at

10^{\circ} \mathrm{C}

. During the day, the temperature rises to

30^{\circ} \mathrm{C}

. How much gasoline will overflow? Given

\alpha

for steel

=1.2 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1}

and

\gamma

for gasoline

=9.5 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1}

View answer and explanation

Correct option: A

1.37 litre

Option A (1.37 litre) is correct because it is calculated by finding the difference between the change in volume of gasoline and the change in volume of the steel tank due to thermal expansion.

8 Medium

8 of 514

Application +4 | -1

One litre glass flask contains some mercury. It is found that at different temperatures the volume of air inside the flask remains the same. What is the volume of mercury in this flask if coefficient of linear expansion of glass is

9 \times {10^{ - 6}}/^\circ C

while volume expansion of mercury is

1.8 \times {10^{ - 4}}/^\circ C.

View answer and explanation

Correct option: C

150 cc

Option C (150 cc) is correct because it is the volume of mercury calculated using the condition that the volume of air remains the same.

9 Medium

9 of 514

Application +4 | -1

A body at

{50^0}C

cools in a surroundings maintained at

{30^0}C

the temperature at which the rate of cooling is half that of the beginning is

View answer and explanation

Correct option: C

{40^0}C

Option C (

{40^0}C

) is correct because it is derived from Newton's law of cooling, where the rate of cooling is proportional to the temperature difference.

10 Medium

10 of 514

Understanding +4 | -1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion (A) When a rod lying freely is heated, no thermal stress is developed in it.
Reason (R) On heating, the length of rod increases.
In the light of the above statements, choose the correct answer from the options given below

View answer and explanation

Correct option: A

Both A and R are true but R is not the correct explanation of A.

Option A is correct because while heating a rod increases its length, thermal stress only develops if the rod is constrained.

11 Medium

11 of 514

Remembering +4 | -1

The reflectance and emittance of a perfectly black body are respectively

View answer and explanation

Correct option: A

0, 1

Option A (0, 1) is correct because a perfectly black body absorbs all incident radiation (reflectance = 0) and emits radiation perfectly (emittance = 1).

12 Medium

12 of 514

Understanding +4 | -1

The quantity

\frac{P V}{K T}

represents:

View answer and explanation

Correct option: D

Number of molecules in the gas

Option D (Number of molecules in the gas) is correct because using the ideal gas law, PV = nRT, and R = N_A * K, we can derive PV/KT = nN_A, which represents the number of molecules.

13 Medium

13 of 514

Application +4 | -1

An amount of water of mass 20 g at

{0^0}C

is mixed with 40 g of water

{10^0}C

final temperature of the mixture

View answer and explanation

Correct option: D

{6.66^0}C

Option D (

{6.66^0}C

) is correct because it represents the final temperature calculated using the principle of heat exchange between the two water masses.

14 Medium

14 of 514

Understanding +4 | -1

On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object at the top of the mountain will register a temperature

View answer and explanation

Correct option: B

Lower than the object at the foot

Option B is correct because the object at the top of the mountain will generally register a lower temperature due to factors like thinner air, more shadows, and less direct sunlight.

15 Medium

15 of 514

Remembering +4 | -1

Psychrometer is used to measure

View answer and explanation

Correct option: A

Relative humidity

Option A (Relative humidity) is correct because a psychrometer measures relative humidity by comparing the readings of a dry-bulb thermometer and a wet-bulb thermometer.

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16 Medium

16 of 514

Understanding +4 | -1

The specific heat capacity of a substance depends on which of following and why?

View answer and explanation

Correct option: D

The material of the substance

Option D (The material of the substance) is correct because specific heat capacity is an intrinsic property of a substance, determined by its molecular structure and composition.

17 Medium

17 of 514

Application +4 | -1

A normal diet furnishes

2000 \mathrm{~kcal}

to a

60 \mathrm{~kg}

person in a day. If this energy was used to heat the person with no losses to the surroundings, how much would the person's temperature increase? The specific heat of the human body

=0.83 \mathrm{~cal} \mathrm{~g}^{-1}{ }^{\circ} \mathrm{C}^{-1}

View answer and explanation

Correct option: A

40.16^{\circ} \mathrm{C}

Option A (

40.16^{\circ} \mathrm{C}

) is correct because it is calculated using the formula

\Delta T = \frac{Q}{mc}

, where Q is the heat energy, m is the mass, and c is the specific heat.

18 Medium

18 of 514

Remembering +4 | -1

Pure substance would freeze or solidify at its:

View answer and explanation

Correct option: A

Melting Point

Option A (Melting Point) is correct because freezing and melting points are the same temperature for a pure substance.

19 Medium

19 of 514

Remembering +4 | -1

Which of the following law states that "good absorbers of heat are good emitters"?

View answer and explanation

Correct option: B

Kirchhoff’s law

Option B (Kirchhoff’s law) is correct because it directly states that good absorbers of heat are good emitters.

20 Medium

20 of 514

Application +4 | -1

Compare the rate of loss of heat from a metal sphere of temperature

827^{\circ} \mathrm{C}

, with the rate of loss of heat from the same sphere at

427^{\circ} \mathrm{C}

, if the temperature of surroundings is

27^{\circ} \mathrm{C}

View answer and explanation

Correct option: A

6.276: 1

Option A (

6.276: 1

) is correct because it is calculated using the Stefan-Boltzmann law of radiation.

21 Medium

21 of 514

Application +4 | -1

The ends of 2 different materials with their thermal conductivities, radii of cross section and length all in the ratio of

1\;:2

maintained at temperature difference. If the rate of the flow of heat in the longer rod is 4 cal

{\mathrm{s}^{ - 1}}

, that in the shorter rod in cal

{\mathrm{s}^{ - 1}}

will be

View answer and explanation

Correct option: A

Option A (1) is correct because the rate of heat flow is directly proportional to thermal conductivity and area, and inversely proportional to length. Considering the ratios, the heat flow in the shorter rod is 1 cal/s.

22 Medium

22 of 514

Application +4 | -1

The temperature of a thin uniform rod increases by

\Delta t

. If moment of inertia I about an axis perpendicular to its length then its moment of inertia increases by

View answer and explanation

Correct option: C

2\alpha I\,\Delta t

Option C (

2\alpha I\,\Delta t

) is correct because the moment of inertia increases proportionally to the square of the length, and the length increases linearly with temperature.

23 Medium

23 of 514

Application +4 | -1

The quantities of heat required to raise the temperatures of two copper spheres of radii

{r_1}\mathrm{and}{r_2}\left( {{r_1} = 1.5{r_2}} \right)

through 1 K are in the ratio of

View answer and explanation

Correct option: C

\frac{9}{4}

Option C (

\frac{{9}}{{4}}

) is correct because the heat required is proportional to the volume (and thus the cube of the radius), but since the temperature change is the same, it simplifies to the ratio of the volumes, which is the cube of the ratio of the radii.

24 Medium

24 of 514

Remembering +4 | -1

Newton’s law of cooling holds good only, if the temperature difference between the body and the surroundings is

View answer and explanation

Correct option: A

Less than

{10^0}C

Option A (Less than

{10^0}C

) is correct because Newton's Law of Cooling is an approximation that works best when the temperature difference is small.

25 Medium

25 of 514

Remembering +4 | -1

Amount of energy required to change liquid to gas and vice versa without any change in temperature is termed as:

View answer and explanation

Correct option: D

Latent heat of vaporization

Option D (Latent heat of vaporization) is correct because the latent heat of vaporization is the energy required to change a substance from a liquid to a gas (or vice versa) at a constant temperature.

26 Medium

26 of 514

Understanding +4 | -1

Statement 1: Specific heat of a substance during change of state is infinite.
Statement 2: During change of state

\Delta Q=m L

, specific heat does not come in.

View answer and explanation

Correct option: A

Statement 1 is true and statement 2 is true

Statement 1 is true because during a change of state, the temperature remains constant, leading to infinite specific heat. Statement 2 is also true as the heat involved is given by

Q = mL

, independent of specific heat.

27 Medium

27 of 514

Analyzing +4 | -1

On heating a liquid of coefficient of cubical expansion

\gamma

in a container having coefficient of linear expansion γ/3, the level of liquid in the container will

View answer and explanation

Correct option: C

Will remain almost stationary

Option C (Will remain almost stationary) is correct because if the cubical expansion of the liquid equals the cubical expansion of the container, the liquid level remains constant.

28 Medium

28 of 514

Remembering +4 | -1

Mercury thermometers can be used to measure temperatures upto

View answer and explanation

Correct option: C

{360^0}C

Option C (

{360^0}C

) is correct because mercury thermometers can be used up to temperatures close to the boiling point of mercury.

29 Medium

29 of 514

Understanding +4 | -1

If black wire of platinum is heated, then its colour first appear red, then yellow and finally white. It can be understood on the basis of

View answer and explanation

Correct option: A

Wien’s displacement law

Option A (Wien’s displacement law) is correct because the change in color with temperature is explained by Wien's displacement law.

30 Medium

30 of 514

Application +4 | -1

Oxygen boils at

- {183^0}C

. This temperature is approximately

View answer and explanation

Correct option: B

- {297^0}F

Option B (

- {297^0}F

) is correct because it's the approximate Fahrenheit equivalent of -183°C, calculated using the conversion formula.

Revision notes and key takeaways

Review THERMAL PROPERTIES OF MATTER in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 514 single-correct-answer MCQs on THERMAL PROPERTIES OF MATTER.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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