Question

Most balloons, tires, and football are made of rubber. This is because rubber is?
A.Naturally available
B.Cheap
C.An electric insulator
D.Soft and flexible

Answer 1

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.

Complete step-by-step answer: Generally, various is 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.
Various properties of natural rubber are as follows:
1.Natural rubber is highly compressible and has high tensile strength.
2.It is resistant to various chemicals and water.
3.Natural rubber is also resistant to wear, tearing, fatigue, abrasion, cutting and so forth.
4.It works within the range of temperature $- 58$ to ${212^0}F$.
Natural rubber is used for various applications which are as follows:
1.Due to compressibility and high tensile strength, it is useful in various engineering applications such as drive couplings, anti-vibration mounts, springs, rubber bands, adhesives and bearings.
2.It is also used in making high-performance tires for buses, aircrafts and race cars because of its heat resistant nature and high tensile strength.
3.It is also used in making shoe soles, footballs and so forth.
Therefore, it is evident from the properties and applications of natural rubber that it is very compressible and has high tensile strength.

Hence, option $D$ is correct.

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.