Everyday Science MCQs, JUNIOR CLERK (BPS 11) PUNJAB PUBLIC SERVICE COMMISSION (S&GAD) 2016, PPSC Solved Past Papers MCQsWhich of the following is used for purification of water?A. Oxygen B. Ammonia C. Chlorine D. Carbon Dioxide Evaluate 48.95 -.32.006 = ?CD-ROM stands for_____.
