Physics
Red light is used for signals because it has

High frequency
Long wavelength
Low refraction in the medium
High intensity

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Reflection of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules

ANSWER DOWNLOAD EXAMIANS APP

Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The sea is wider than the river
The density of sea water is more than the density of river water

ANSWER DOWNLOAD EXAMIANS APP