Post category:Biology MCQs / Chemistry Mcqs / Everyday Science Mcqs / Physics Mcqs Post comments:0 Comments The principal constituent of the atmosphere of the Earth is? A. Oxygen B. Carbon C. Hydrogen D. Nitrogen Read more articles Previous PostThe SI unit of electric current is? Next PostWhat is Dry Ice? You Might Also Like _______ planets orbits around the sun in a clockwise direction? June 21, 2020 An Example of Longitudinal Wave is February 18, 2022 In night, when photosynthesis is stopped, plants_____. March 10, 2022 The most abundant element in the Earth’s crust: May 23, 2021 Friction can be reduced by changing from? July 29, 2020 Vermiform appendix is a part of? November 25, 2020 Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment. Δ