NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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Statement-I: To have same difference between the lengths of two metallic rods their initial lengths of

0^{\circ} \mathrm{C}

should be in the inverse ratio of their coefficient of linear expansion.
Statement-II: If the lengths of two metallic rods at

0^{\circ} \mathrm{C}

are in the inverse ratio of their coefficient of linear expansion then the change in the lengths due to same rise of temperature is same.

View answer and explanation

Correct option: A

Statement-I is true and statement-II is true

Option B (Statement-I is true and statement-II is false) is correct because a thinner rod expands more due to less resistance to expansion, and linear expansion depends on more than just initial length.

More Questions from THERMAL PROPERTIES OF MATTER

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

60 \mathrm{~cm} \times 50 \mathrm{~cm} \times 20 \mathrm{~cm}

is placed in an insulation box of wall thickness

1 \mathrm{~cm}

. The box keeping the ice cube at

0^{\circ} \mathrm{C}

of temperature is brought to a room of temperature

40^{\circ} \mathrm{C}

. The rate of melting of ice is approximately.

(Latent heat of fusion of ice is

3.4 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}

and thermal conducting of insulation wall is

\left. {0.05{\text{W}}{{\text{m}}^{ - 1}}^\circ {{\text{C}}^{ - 1}}} \right)

A black body radiates heat energy at the rate of

2 \times 10^5 \mathrm{~J} / \mathrm{sm}^2

at temp. of

127^{\circ} \mathrm{C}

. The temp of black body at which rate becomes

32 \times 10^5 \mathrm{~J} / \mathrm{s}-\mathrm{m}^2

is: The amount of radiation emitted by a perfectly black body is proportional to Amount of heat required to raise the temperature of a body through 1K is called its If Poisson’s ratio

\sigma

+ \frac{1}{2}

for a material, then the material is