PPSC Past Paper 2020 For the Post of Labour Officer, General Knowledge MCQs, PPSC Solved Past Papers MCQsThe first UN Conference on Environment and Development was held in 1992 at?A. Johannesburg B. Nairobi C. New York D. Rio de Janeiro Which of the following Governor General of Pakistan died in exile?Fill in the blank with appropriate preposition: He was indignant______ me for no reason?