PPSC Past Paper Assistant Director Local Govt. & Community Development 2018 Solved MCQs, General Knowledge MCQs, PPSC Past Paper Junior Clerk S & GD 2018 solved MCQs, PPSC Solved Past Papers MCQsWhich gas is commonly used in balloons and airships?A. Hydrogen B. Helium C. Carbon di oxide D. Hydrogen Sulphide Human heart consists of how many chambers?Solar eclipse occurs when?
