The handle of pressure cookers is made of plastic because it should be made nonconductor of heat. The plastic used there is the first man-made plastic, which is :

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Q: 9 (CDS-I/2016)
The handle of pressure cookers is made of plastic because it should be made nonconductor of heat. The plastic used there is the first man-made plastic, which is :

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,59,50,21,20,8,60

keywords: 

{'pressure cookers': [0, 0, 0, 1], 'plastic': [0, 0, 0, 1], 'nylon': [0, 0, 0, 2], 'polythene': [0, 0, 0, 1], 'terylene': [0, 0, 0, 2], 'handle': [0, 0, 0, 2]}

The handle of pressure cookers is made of plastic to ensure that it does not conduct heat. The plastic used for this purpose is the first man-made plastic, which is Bakelite.

Let`s understand why Bakelite is suitable for the handle of pressure cookers. Bakelite is a thermosetting plastic that was invented by Leo Baekeland in 1907. It was the first synthetic plastic made from a combination of phenol and formaldehyde. One of the key properties of Bakelite is its excellent heat resistance. It is a poor conductor of heat, which means it does not easily transfer heat energy.

By using Bakelite for the handle of pressure cookers, manufacturers ensure that the handle remains cool to the touch even when the cooker is subjected to high temperatures. This is important for the safety and comfort of the user. Unlike other plastic options such as Polythene, Terylene, and Nylon, Bakelite`s heat-resistant properties make it an ideal material for this purpose.

Therefore, the correct answer is option 4 - Bakelite.