PPSC Past Paper Assistant Planning & Development 2019 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsBrass gets discolored in air because of the presence of which of the following gases in air?A. Oxygen B. Hydrogen Sulphide C. Carbon dioxide D. Nitrogen Which country on 14 July 2020 has banned China’s Huawei 5G equipment?The town is 100 meters ____ sea level?
