PPSC Past Paper Labour Inspector(BS-14) 2019 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsMercury Thermometer was invented by?A. James Gosling B. Daniel Gabriel Fahrenheit C. Ian Tunning D. None of these Salaahuddin Ayubi buried at?Which country becomes world’s first country to develop COVID-19 vaccine?
