PPSC Past Paper Assistant Director Punjab Employees Social Security Institution (PESSI) 2019 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsTo observe a human behavior by living a natural setting is called?A. Experimental Method B. Survey C. Observation Method D. Both A & B Which one of the following can be used to focus sun light?Tick the antonym of impeccable?
