Are you Ready for Insta 75 Days Revision Plan (UPSC Prelims - 2020)?
13 October 2014
1) Discuss the differences between LED, Mercury vapour lamps and incandescent lamps. Which among them should be more widely used and why? (200 Words)
2) Write a note on the science behind working of an LED lamp.
3) Write short notes on:(100 Words)
a) Place Cells
b) Grid Cells