S1:          Metals are today being replaced by polymers in many applications. P :           Above all, they are cheaper and easier to process making them a viable alternative to metals. Q :          Polymers are essentially a long chains of hydrocarbon molecules. R :          Today polymers as strong as metals have been developed. S :           These have replaced the traditional chromium-plated metallic bumpers in cars. S6:          Many Indian Institutes of science and Technology run special programmes on polymer science. The Proper sequence should be: