Physics QuizTheLastDialogue PHYSICS QUIZ Test Your Knowledge Of Physics With These Quizzes Physics Online Quiz for Kids and Adults #1. What is the speed of Light? Approx. 200,000 Km per second Approx. 200,000 Km per second Approx. 300,000 Km per second Approx. 300,000 Km per second Approx. 300,000 Km per hour Approx. 300,000 Km per hour Approx. 200,000 Km per minute Approx. 200,000 Km per minute Work Harder #2. What is the known smallest thing in this universe? Protons Protons Hadrons Hadrons Atom Atom Quark Quark Work Harder #3. Light year is a measurement unit for: Light Light Time Time Distance Distance Brightness Brightness Work Harder Finish Results Well Done. You Are Roaring Like A Lion Keep Working. Slow & Steady Wins The Race START NEW