Question

Most balloons, tires and footballs are made of rubber. This is because rubber is:
(A) Naturally available
(B) Cheap
(C) An electrical insulator
(D) Soft and flexible

Answer 1

Hint : This question gives knowledge about the natural rubber. Natural rubber is basically the polymer of isoprene units which are loosely attached that is why it is known as polyisoprene. Natural rubber is created from plants and is delegated as a polymer. A chemical compound with huge atoms made of numerous small particles of a similar kind.

Complete Step By Step Answer:
Generally, various isoprene units connect with each other to form natural rubber. It is obtained from the latex sap of rubber plants. Natural rubbers are different from synthetic rubbers because natural rubbers are obtained from plants whereas synthetic rubbers are synthesized in laboratories. Synthetic rubbers are generally synthesized from petro chemicals. It is very elastic in nature.
Isoprene was first segregated by the decay of natural rubber. About ninety five percent of isoprene creation is utilized to deliver cis-polyisoprene - a manufactured variant of natural rubber. Characteristic rubber comprises chiefly of poly-cis-isoprene.
Before elastic tires, metal and wood were the materials being used. Anyway, it was discovered that common Rubber gives better padding, makes less noise.
Therefore, it is evident from the properties and applications of natural rubber that it is very compressible and has high tensile strength. So, the major reason for making most of the balloons, tires and footballs by rubber is it is soft and flexible.
Correct answer is option D.

Note :
Natural rubber is a polymer which is manufactured by the addition of various isoprene units. Because of compressibility and high tensile strength of natural rubber, it is useful in various engineering applications such as drive couplings, anti-vibration mounts, springs, rubber bands, adhesives and bearings.