Online GK Series

This site is dedicated to the aspirants of competitive exams SSC, UPSC, Railways, Postal Assistants, Bank, GATE and NET

Connect with Universities & Study Abroad Experts Instantly Connect Now


What are Rubies and Sapphires chemically known as ?

A Lead tetroxide
B Silicon dioxide
C Boron nitride
D Aluminium oxide
Answer & Explanation
Option: [D]

Your Valuable Comments Please...

Important EBooks for Competitive Exams