Question

The danger signals installed at the top of tall buildings are red in color. These can be easily seen from a distance because among all other colors, the red light 

(a) is scattered the most by smoke or fog 

(b) is scattered the least by smoke or fog 

(c) is absorbed the most by smoke or fog 

(d) moves fastest in air

Answer 1

The answer is (b) is scattered the least by smoke or fog

Wavelength of red color is the largest thus it can easily be seen from a distance. It is the color which is least scattered by the smoke or smog