Advertisements
Advertisements
प्रश्न
Explain why the following is made of thermosetting plastics.
Saucepan handles
Advertisements
उत्तर
Saucepan handles are made of thermosetting plastics because these plastics do not get softened on heating. Also, thermosetting plastics such as bakelite are poor conductors of heat.
संबंधित प्रश्न
Fill in the blanks with appropriate words.
Like synthetic fibres, plastic is also a _______
Describe an activity to show that thermoplastic is a poor conductor of electricity.
Who is my partner?
| 'A' column | 'B' column |
| a. Lead glass | i. Plates |
| b. Bakelite | ii. Mattresses |
| c. Thermocol | iii. Electric bulb |
| d. Optic glass | iv. Electric switch |
| e. Polypropylene | v. Lens |
Write the natural or manmade raw material of the following items.
Mattress, glass vessel, bangle, chair, gunny bag, broom, knife, pen.
Write short note.
Uses of plastic.
Give example of material that can be used again.
Read the following information and convert them into a graph to compare the countries and the amount of plastic they use.
China contributes the highest share - that is around 28%, of the total plastic used globally. Indonesia uses 10%, both the Philippines and Vietnam use 6% each; Thailand uses 3.2%, Egypt 3%, Nigeria 2.7% and South Africa 2%.
Explain why the following is made of thermosetting plastics?
Electric plugs/switches/plug boards
Plastic articles are available in all possible shapes and sizes. Can you tell why?
Mention a few household products in which microbeads can be found.
