PPSC Past Paper Assistant Planning & Development 2019 Solved MCQs, General Knowledge MCQs, PPSC Solved Past Papers MCQsWho invented the telephone? Posted on April 21, 2021 by Rana TahirA. Graham Bell B. Robert koch C. Newton D. none of theseShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)