PPSC Assistant (BS-16)-(PESS) Labour And Human Resource – 2020, General Knowledge MCQs, PPSC Solved Past Papers MCQsWhich of the following is a man-made substance? Posted on April 1, 2021 by Rana TahirA. Plastic B. Rubber C. Steel D. IronShare 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)