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JEE • PHYSICS • THERMAL PROPERTIES OF MATTER

Thermal properties of matter practice · Easy

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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 33 questions

1 Easy

1 of 33

Remembering +4 | -1

On Which of the following scales of temperature, the temperature is never negative

View answer and explanation

Correct option: D

Kelvin

Option D (Kelvin) is correct because the Kelvin scale starts at absolute zero, and all temperatures are positive relative to that.

2 Easy

2 of 33

Application +4 | -1

A wire of cross sectional area

4\,m{m^2}

is fixed between two points at

{30^ \circ }C.Y = 2 \times {10^{11}}pa

and

\alpha = {10^{ - 5}}/\,{\,^ \circ }C

; When the temperature falls to

{20^ \circ }C

, the tension in the string in (newton) is

View answer and explanation

Correct option: C

Option D (80) is correct because it is the tension calculated using the formula involving Young's modulus, area, coefficient of linear expansion, and temperature difference.

3 Easy

3 of 33

Remembering +4 | -1

“Good emitters are good absorbers” is a statement concluded from

View answer and explanation

Correct option: D

Kirchhoff’s law

Option D (Kirchhoff’s law) is correct because Kirchhoff's law of thermal radiation states that at thermal equilibrium, the emissivity and absorptivity of a body are equal.

4 Easy

4 of 33

Understanding +4 | -1

Assertion: If an electric fan be switched ON in a closed room, the air of the room will be cooled.
Reason: Fan air decreases the temperature of the room.

View answer and explanation

Correct option: D

If both assertion and reason are false

The correct answer is D (If both assertion and reason are false) because an electric fan in a closed room will slightly heat the air, not cool it, and the fan does not decrease the room's temperature.

5 Easy

5 of 33

Understanding +4 | -1

An anisotropic substance has coefficients of linear thermal expansions

{\alpha_1},\,\,{\alpha_2},\,\,{\alpha_3}

along x, y, z axes respectively. Coefficient of cubical expansion of its material is

View answer and explanation

Correct option: A

{\alpha_1} + {\alpha_2} + {\alpha_3}

Option A (

{\alpha_1} + {\alpha_2} + {\alpha_3}

) is correct because the coefficient of cubical expansion is the sum of the linear expansion coefficients along the three axes in an anisotropic substance.

6 Easy

6 of 33

Understanding +4 | -1

Assertion: When hot water is poured in a beaker of thick glass, the beaker cracks.
Reason: Outer surface of the beaker expands suddenly.

View answer and explanation

Correct option: C

 assertion is true, but reason is false

Option C ( assertion is true, but reason is false) is correct because while the beaker does crack, the reason is due to the inner surface expanding more than the outer, not just the outer surface expanding.

7 Easy

7 of 33

Remembering +4 | -1

The temperature of the sun is measured with

View answer and explanation

Correct option: C

Pyrometer

Option C (Pyrometer) is correct because pyrometers are non-contact thermometers used to measure high temperatures, such as those of the sun or furnaces.

8 Easy

8 of 33

Understanding +4 | -1

The cofficient of volume expansion of a liquid is

\boldsymbol{\gamma}

, it is filled in a container of a material having the coefficient of linear expansion

\boldsymbol{\alpha}

. If the liquid overflows on heating:

View answer and explanation

Correct option: B

\gamma>3 \alpha

Option B (

\gamma>3 \alpha

) is correct because for the liquid to overflow, its volume expansion must be greater than the container's volume expansion.

9 Easy

9 of 33

Understanding +4 | -1

Four identical calorimeters painted in different colours, are heated to same temperature and then allowed to cool in vacuum. Which will cool fastest?

View answer and explanation

Correct option: C

One which is painted thick black

Option C is correct because black surfaces are the best emitters of radiation, leading to faster cooling.

10 Easy

10 of 33

Application +4 | -1

0^{\circ} \mathrm{C}

, the densities of a cork and a liquid in which the cork floats are

\mathrm{d}_1

and

\mathrm{d}_2

respectively. The coefficients of expansion for the material of the cork and the liquid are

\gamma

and

100 \gamma

respectively. If the cork sinks when temperature of liquid is

\mathrm{t}^{\circ} \mathrm{C}

, then ratio

\left(\mathrm{d_2 / d}_1\right)

View answer and explanation

Correct option: A

\frac{1+100 \gamma \mathrm{t}}{1+\gamma \mathrm{t}}

Option A (

\frac{1+100 \gamma \mathrm{t}}{1+\gamma \mathrm{t}}

) is correct because it represents the ratio of densities required for the cork to sink at temperature t, considering thermal expansion.

11 Easy

11 of 33

Understanding +4 | -1

Colour of shining bright star is an indication of its

View answer and explanation

Correct option: C

Temperature

Option C is correct because the color of a star is directly related to its surface temperature, as described by Wien's displacement law.

12 Easy

12 of 33

Remembering +4 | -1

Stem corrections' in Platinum resistance thermometers are eliminated by the use of

View answer and explanation

Correct option: A

Compensating leads

Option A (Compensating leads) is correct because they are used to eliminate stem corrections in platinum resistance thermometers.

13 Easy

13 of 33

Understanding +4 | -1

On heating one end of a rod, the temperature of whole rod will be uniform when :-

View answer and explanation

Correct option: D

{K}=\infty

Option D is correct because for the temperature to be uniform throughout the rod, the thermal conductivity (K) must be infinite, allowing heat to distribute instantaneously.

14 Easy

14 of 33

Remembering +4 | -1

Which of the following pairs is wrong

View answer and explanation

Correct option: B

Relative density-Pyrometer

Option B (Relative density-Pyrometer) is correct because a pyrometer measures high temperatures, not relative density.

15 Easy

15 of 33

Application +4 | -1

Two metallic wires of identical dimensions are connected in series. If

\sigma_1

and

\sigma_2

are the conductivities of these wires respectively, the effective conductivity of the combination is :

View answer and explanation

Correct option: B

\frac{2 \sigma_1 \sigma_2}{\sigma_1+\sigma_2}

Option B (

\frac{2 \sigma_1 \sigma_2}{\sigma_1+\sigma_2}

) is correct because it correctly calculates the effective conductivity of two wires connected in series.

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16 Easy

16 of 33

Understanding +4 | -1

If a carved black utensil is heated to high temperature and then brought in dark then:

View answer and explanation

Correct option: C

Only utensil will shine

Option C (Only utensil will shine) is correct because black objects are good absorbers and emitters of radiation, so the utensil will emit light when heated, while the carving's contrast will diminish.

17 Easy

17 of 33

Application +4 | -1

What is the percentage change in length of 1m iron rod if its temperature changes by

{100^ \circ }C\,

\left[ {\alpha \,\,\mathrm{for}\,\mathrm{iron}\, = \,2 \times {{10}^{ - 5}}\,/{\,^ \circ }C} \right]

View answer and explanation

Correct option: A

0.002

Option A (0.20%) is correct because the percentage change in length is calculated using the formula

\alpha \Delta t \times 100

18 Easy

18 of 33

Application +4 | -1

Calculate radiation power for sphere whose temperature is

227^{\circ} \mathrm{C}

and radius

0.2

and emissivity

0.8.

View answer and explanation

Correct option: A

1425 \mathrm{~W}

Option A (

1425 \mathrm{~W}

) is correct because it is calculated using the Stefan-Boltzmann law:

P = \sigma A e T^4

19 Easy

19 of 33

Remembering +4 | -1

The correct value of

{0^0}C

on the Kelvin scale is

View answer and explanation

Correct option: A

273.15 K

Option A (273.15 K) is correct because the Kelvin scale is defined such that 0°C is equal to 273.15 K.

20 Easy

20 of 33

Application +4 | -1

Resistance of the wire is measured as

2\,\Omega

and

3\,\Omega

10^\circ \,C

and

30^\circ \,C

respectively. Temperature co-efficient of resistance of the material of the wire is:

View answer and explanation

Correct option: A

0.033^\circ \,{C^{ - 1}}

Option A (

0.033^\circ \\,{C^{ - 1}}

) is correct because the temperature coefficient of resistance is calculated using the given resistance values at different temperatures.

21 Easy

21 of 33

Understanding +4 | -1

For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

View answer and explanation

Correct option: B

In cool air near the bottom and hot air out near the roof

Option B (In cool air near the bottom and hot air out near the roof) is correct because hot air rises and cool air sinks, creating a natural convection current.

22 Easy

22 of 33

Understanding +4 | -1

Ratio among linear expansion coefficient

(\alpha )

areal expansion coefficient

(\beta )

and volume expansion coefficient

(\gamma )

View answer and explanation

Correct option: A

1:2:3

Option B (

45^\circ

) is correct because the angle of friction is the arctangent of the coefficient of friction, and arctan(1) = 45 degrees.

23 Easy

23 of 33

Remembering +4 | -1

The lower and upper fixed points in Reaumur scale is

View answer and explanation

Correct option: A

0^\circ R,\,\,\,80^\circ R

Option A (

0^\circ R,\,\,\,80^\circ R

) is correct because the lower fixed point (LFP) and upper fixed point (UFP) on the Reaumur scale are defined as 0°R and 80°R, respectively.

24 Easy

24 of 33

Understanding +4 | -1

Water does not freeze at the bottom of the lakes in winter because

View answer and explanation

Correct option: C

Of anomalous expansion of water between

4^\circ \mathrm{C}

0^\circ \mathrm{C}

Option C is correct because water has an anomalous expansion property between 0°C and 4°C, causing the warmer (denser) water to stay at the bottom.

25 Easy

25 of 33

Application +4 | -1

On a hypothetical scale. A the ice point is

{42^ \circ }C

and the steam point is

{182^ \circ }C

for another scale B the ice point is

- {10^ \circ }

and steam. Point is

{90^ \circ }

. If B reads

{60^ \circ }

the reading of A

View answer and explanation

Correct option: B

{140^ \circ }

Option B (

{140^ \circ }

) is correct because it is the corresponding temperature on scale A when scale B reads

{60^ \circ }

, calculated using the given reference points.

26 Easy

26 of 33

Application +4 | -1

Find the water equivalent of copper block of mass 200g. The specific heat of copper is

0.09\,cal/g^\circ C\,.

View answer and explanation

Correct option: A

18 gram

Option A (18 gram) is correct because the water equivalent is calculated by multiplying the mass of the copper block by its specific heat.

27 Easy

27 of 33

Remembering +4 | -1

Water has maximum density at

View answer and explanation

Correct option: D

{4^0}C

Option D (

{4^0}C

) is correct because water has its maximum density at 4 degrees Celsius due to the unique hydrogen bonding structure.

28 Easy

28 of 33

Remembering +4 | -1

Which of the following instrument is used measure temperature of the source from its thermal radiations?

View answer and explanation

Correct option: C

Pyrometer

Option C (Pyrometer) is correct because pyrometers are specifically designed to measure temperature based on thermal radiation emitted by a source.

29 Easy

29 of 33

Understanding +4 | -1

Two bars of copper having same length but unequal diameter are heated to the same temperature. The change in length will be

View answer and explanation

Correct option: C

Same for both the bars

Option C (Same for both the bars) is correct because the change in length depends on the original length, coefficient of linear expansion, and temperature change, all of which are the same for both bars.

30 Easy

30 of 33

Application +4 | -1

There is some change in length when 33000 N tensile force is applied on a steel rod of area of cross section

{10^{ - 3}}{m^2}

. The change in temperature required to produce the same elongation of elasticity is

3 \times {10^{11}}\,N/{m^2}

and the co-efficient of linear expansion of steel is

1.1 \times {10^{ - 5}}/{\,^ \circ }C

View answer and explanation

Correct option: C

{10^ \circ }C

Option C (

{10^ \circ }C

) is correct because it is the temperature change calculated using the relationship between tensile force, Young's modulus, area, and coefficient of linear expansion.

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 33 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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