Physics
The blue colour of sky is due to

Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight

ANSWER DOWNLOAD EXAMIANS APP

Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The stone conveys the heat away from the feet more rapidly than the carpet
The carpet is a better conductor of heat than the stone
The human body maintains a constant temperature
The floor and carpet are at different temperatures

ANSWER DOWNLOAD EXAMIANS APP