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NEET • PHYSICS • THERMAL PROPERTIES OF MATTER

Thermal properties of matter practice · Medium

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1 Medium

1 of 176

Remembering +4 | -1

The amount of radiation emitted by a perfectly black body is proportional to

View answer and explanation

Correct option: C

Fourth power of temperature on ideal gas scale

Option C (Fourth power of temperature on ideal gas scale) is correct because Stefan-Boltzmann law states that the total energy radiated per unit surface area of a black body is directly proportional to the fourth power of its absolute temperature.

2 Medium

2 of 176

Remembering +4 | -1

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

View answer and explanation

Correct option: B

Thermal Capacity

Option A (

PV

) is correct because Boyle's law states that for a fixed mass of gas at constant temperature, the product of pressure and volume is constant.

3 Medium

3 of 176

Understanding +4 | -1

If Poisson’s ratio

\sigma

+ \frac{1}{2}

for a material, then the material is

View answer and explanation

Correct option: A

Incompressible

Option A (Incompressible) is correct because a Poisson's ratio of +1/2 indicates that the material's volume remains constant under deformation, which is the definition of incompressibility.

4 Medium

4 of 176

Understanding +4 | -1

Which of the following statements is correct for a bulb thermometer?

View answer and explanation

Correct option: A

The bulb of the thermometer is made of a conducting material

Option A (The bulb of the thermometer is made of a conducting material) is correct because a conducting material allows for rapid heat transfer between the environment and the liquid inside the bulb, ensuring accurate temperature readings.

5 Medium

5 of 176

Remembering +4 | -1

In which mode of transmission, the heat waves travel along straight line with the speed of light?

View answer and explanation

Correct option: A

Thermal radiation

Option A (Thermal radiation) is correct because thermal radiation involves the emission of electromagnetic waves, which travel in straight lines at the speed of light.

6 Medium

6 of 176

Understanding +4 | -1

Equal masses of two liquids are filled in two similar calorimeters. The rate of cooling will

View answer and explanation

Correct option: B

Depend on the specific heats of liquids

Option B (Depend on the specific heats of liquids) is correct because the rate of cooling is inversely proportional to the specific heat capacity of the liquid.

7 Medium

7 of 176

Remembering +4 | -1

What extinguishes a fire most quickly?

View answer and explanation

Correct option: B

Boiling water

Option B (Boiling water) is correct because boiling water turns into steam more rapidly, displacing oxygen and cooling the fire more effectively than cold or hot water.

8 Medium

8 of 176

Application +4 | -1

Certain quantity of water cools from

70^\circ \,C

60^\circ \,C

in the first 5 minutes and to

54^\circ \,C

in the next 5 minutes. The temperature of the surrounding is

View answer and explanation

Correct option: D

45^\circ C

Option D (

45^\circ C

) is correct because it is calculated using Newton's Law of Cooling, which relates the rate of cooling to the temperature difference between the object and its surroundings.

9 Medium

9 of 176

Application +4 | -1

If temperature of an object is

{140^0}F

then its temperature in centigrade is

View answer and explanation

Correct option: D

{60^0}C

Option D (

{60^0}C

) is correct because it is the correct conversion of 140°F to Celsius.

10 Medium

10 of 176

Understanding +4 | -1

The quantity of heat which crosses per unit area of a metal plate during conduction depends upon

View answer and explanation

Correct option: B

The temperature gradient perpendicular to the area

Option B (The temperature gradient perpendicular to the area) is correct because the rate of heat transfer is directly proportional to the temperature gradient according to Fourier's Law.

11 Medium

11 of 176

Remembering +4 | -1

Heat given to a body which raises its temperature by

1^{\circ} \mathrm{C}

is:

View answer and explanation

Correct option: B

Thermal capacity

Option B (Thermal capacity) is correct because thermal capacity is defined as the amount of heat required to raise the temperature of a body by 1°C.

12 Medium

12 of 176

Application +4 | -1

The resistance of the wire in the platinum resistance thermometer at ice point is 5

\Omega

and at steam point is 5.25

\Omega

.When the thermometer is inserted in an unknown hot bath its resistance is found to be 5.5

\Omega

. The temperature of the hot bath is

View answer and explanation

Correct option: B

{200^0}C

Option B (

{200^0}C

) is correct because the temperature is calculated using the linear relationship between resistance and temperature.

13 Medium

13 of 176

Understanding +4 | -1

Temperature of water at the surface of lake is

- {20^0}C

. Then temperature of water just below the lower surface of ice layer is

View answer and explanation

Correct option: B

{0^0}C

Option B (

{0^0}C

) is correct because the water just below the ice layer will be at the freezing point, which is

{0^0}C

14 Medium

14 of 176

Remembering +4 | -1

Distribution of energy in the spectrum of a black body can be correctly represented by

View answer and explanation

Correct option: C

Planck’s law

Option C (Planck’s law) is correct because Planck's law accurately describes the spectral distribution of energy emitted by a black body at all wavelengths and temperatures.

15 Medium

15 of 176

Analyzing +4 | -1

Assertion (A) : A conducting rod is placed between boiling water and ice. If rod is broken into two equal parts and two parts are connected side by side, then rate of melting of ice will increase to four times.

Reason (R) : Thermal resistance will become four times.

View answer and explanation

Correct option: C

If Assertion is true, but the Reason is false.

Option C (If Assertion is true, but the Reason is false) is correct because while the assertion about increased melting rate is true, the thermal resistance becomes one-fourth, not four times.

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16 Medium

16 of 176

Application +4 | -1

A liquid of coefficient of cubical expansion

\gamma

is filled in a container having coefficient of linear expansion

\frac{\gamma }{3}

. On heating, liquid level in the container will

View answer and explanation

Correct option: C

Remain same

Option C (Remain same) is correct because the apparent expansion of the liquid equals the expansion of the container, resulting in no change in the liquid level.

17 Medium

17 of 176

Application +4 | -1

Which of the following cylindrical rods will conduct most heat, when their ends are maintained at the same steady temperature

View answer and explanation

Correct option: D

Length\,\,1\,\,m;radius\,\,2\,\,cm

Option D (

Length\,\,1\,\,m;radius\,\,2\,\,cm

) is correct because heat conduction is inversely proportional to length and directly proportional to the cross-sectional area (which depends on the square of the radius).

18 Medium

18 of 176

Application +4 | -1

The ratio of radiant energies radiated per unit surface area by two bodies is 16 : 1, the temperature of hotter body is

1000K

, then the temperature of colder body will be

View answer and explanation

Correct option: B

500K

Option B (

500K

) is correct because the radiant energy is proportional to the fourth power of the temperature, so the temperature of the colder body is half that of the hotter body.

19 Medium

19 of 176

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 is the approximate conversion of -183°C to Fahrenheit.

20 Medium

20 of 176

Understanding +4 | -1

A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass

View answer and explanation

Correct option: A

Low thermal conductivity

Option A (Low thermal conductivity) is correct because low thermal conductivity prevents heat from distributing evenly, causing stress and cracking during cooling.

21 Medium

21 of 176

Analyzing +4 | -1

(A): Temperatures near the sea coast are moderate.
(R): Water has a high thermal conductivity.

View answer and explanation

Correct option: B

If both A and R are true but R is not the correct explanation of A

Option B (If both A and R are true but R is not the correct explanation of A) is correct because temperatures near the sea coast are moderate due to water's high specific heat, not its thermal conductivity.

22 Medium

22 of 176

Understanding +4 | -1

The wavelength of radiation emitted by a body depends upon

View answer and explanation

Correct option: C

The temperature of its surface

Option C (The temperature of its surface) is correct because, according to Wien's displacement law, the wavelength of maximum emission is inversely proportional to the temperature of the surface.

23 Medium

23 of 176

Remembering +4 | -1

Thermoelectric thermometer is based on

View answer and explanation

Correct option: B

Seebeck effect

Option B (Seebeck effect) is correct because thermoelectric thermometers utilize the Seebeck effect, which generates a voltage when there is a temperature difference between two different metals or semiconductors.

24 Medium

24 of 176

Remembering +4 | -1

The surface temperature of the stars is determined using

View answer and explanation

Correct option: B

Wien’s displacement law

Option B (Wien’s displacement law) is correct because Wien's displacement law relates the peak wavelength of emitted radiation to the temperature of a black body, allowing for temperature determination.

25 Medium

25 of 176

Understanding +4 | -1

Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky

View answer and explanation

Correct option: C

The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other

Option C is correct. Evaporation from the wet hanky cools the bulb of that thermometer, resulting in a lower temperature reading compared to the dry-bulb thermometer.

26 Medium

26 of 176

Remembering +4 | -1

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by

{1^0}C

and it is defined under which of the following conditions?

View answer and explanation

Correct option: A

From

{14.5^0}C

{15.5^0}C

at 760 mm of Hg

Option A (From

{14.5^0}C

{15.5^0}C

at 760 mm of Hg) is correct because the calorie is specifically defined as the heat required to raise the temperature of 1 g of water from 14.5°C to 15.5°C at standard atmospheric pressure (760 mm of Hg).

27 Medium

27 of 176

Understanding +4 | -1

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

View answer and explanation

Correct option: B

Metal has high thermal conductivity

Option B (Metal has high thermal conductivity) is correct because metal conducts heat away from your hand more quickly than wood, making it feel colder.

28 Medium

28 of 176

Analyzing +4 | -1

Assertion: In a pressure cooker the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.
Reason: The impurities in water bring down its boiling point.

View answer and explanation

Correct option: C

If assertion is true, but reason is false

The assertion is true because reducing pressure lowers the boiling point. The reason is false because impurities elevate the boiling point.

29 Medium

29 of 176

Remembering +4 | -1

Calorimeters are made of which of the following

View answer and explanation

Correct option: B

Metal

Option B (Metal) is correct because metals have high thermal conductivity, allowing for rapid heat transfer and accurate temperature measurements within the calorimeter.

30 Medium

30 of 176

Application +4 | -1

If there are no heat losses, the heat released by the condensation of

xg

of steam at

{100^0}C

into water at

{100^0}C

can be used to convert

y\,\,gm

of ice at

{0^0}C

into water at

{100^0}C

. Then the ratio

y:x

is nearly

View answer and explanation

Correct option: D

3:1

Option D (

3:1

) is correct because the heat released by steam condensation is three times the heat required to raise the temperature of ice to 100°C.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 176 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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