NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

1 Easy

1 of 1

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 (One which is painted thick black) is correct because black surfaces are the best emitters of radiation, according to Kirchhoff's law of thermal radiation, leading to the fastest cooling in a vacuum.

More Questions from THERMAL PROPERTIES OF MATTER

Practice All Chapter MCQs →

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 A liquid having coefficient of cubical expansion

\gamma

is filled in the container having coefficient of linear expansion

\alpha

. If on heating the liquid overflows, then which of the following relations is correct?