Thermoplastic materials are those materials which

A. Are formed into shape under heat and pressure and results in a permanently hard product

B. Do not become hard with the application of heat and pressure and no chemical change occurs

C. Are flexible and can withstand considerable wear under suitable conditions

D. Are used as a friction lining for clutches and brakes

Answer: Option B

Solution(By Examveda Team)

Thermoplastic materials can be cooled and heated several times without any change in their chemistry or mechanical properties.
A thermoplastic, or thermosoftening plastic, is a plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling.