Q. Natural rubber is not used in making footwear for polar regions because
A) Natural rubber becomes soft at temperature lower than$10{^\circ}C.$
B) Natural rubber becomes brittle at temperature lower than$10{^\circ}C.$
C) Natural rubber melts at temperature lower than $10{^\circ}C.$
D) Natural rubber becomes stronger at temperature lower than $10{^\circ}C.$
Explanation
(b)
Natural rubber is a linear polymer of isoprene (2-methyl-1, 3-butadiene). It becomes soft at high temperature (335 K) and brittle at low temperature (< 283),so it is not used in making footwear for polar regions.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.