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NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

1 Medium

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Analyzing +4 | -1

Statement-I: The linear coefficients of expansion of a crystal along three perpendicular axes are

\alpha, \frac{-\alpha}{2}, \frac{\alpha}{5}.

Its volume coefficient is

\frac{7 \alpha}{10}

Statement-II: For anisotropic solids

\gamma=\alpha_x+\alpha_y+\alpha_z

.

View answer and explanation

Correct option: A

Statement-I is true and statement-II is true

Statement-I is true and statement-II is true is the correct answer because the volume coefficient of expansion is the sum of the linear coefficients of expansion along three perpendicular axes for anisotropic solids, and the calculation in Statement-I is correct.

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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

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