Physics
Propagation of sound can be visualised as propagation of ________ variations in the medium

Viscosity
Elasticity
Density
Porosity

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Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
non-luminous heavenly bodies
luminous heavenly bodies that twinkle

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
Two thin shirts become thicker so prevent transmission of heat
No radiation of heat takes place

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