Q. Which colour of light in visible spectrum has highest energy?
Answer: Violet
Notes: Violet colour in visible spectrum is having highest energy and least wavelength among all the components of visible spectrum. 
Descending order of energies : Violet>Indigo>Blue>Green>Yellow>Orange>Red.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 61 in Physics GK 19 - Light and Human Eye in above course in App.