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प्रश्न
PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?
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उत्तर
Thermoplastics get deformed easily on heating and can be bent easily on heating. On the other hand, thermosetting plastics when moulded once cannot be softened on heating.
Thermoplastics → Polythene and PVC
Thermosetting plastics → Bakelite and melamine
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संबंधित प्रश्न
Write uses of PVC.
Write the natural or manmade raw material of the following items.
Mattress, glass vessel, bangle, chair, gunny bag, broom, knife, pen.
Distinguish between.
Man made material and natural material.
Explain the effect of following materials on environment and human health.
1. Plastic
2. Glass
3.Thermocol.
Which measures will you arrange to minimize the environmental problems arising due to non-degradable plastic?
Can you replace the following packaging material with those which can be recycled or reused.
Glass tumblers packed in thermocol box.
HOTS
The Tamil Nadu Government has banned the use of one-time use throwaway plastics. Why do you think this is important?
Plastics are flexible and waterproof and some are even UV resistant.
Assertion (A): PVC is an unsafe plastic.
Reason (R): Burning PVC releases dioxins, a most toxic chemical.
Answer the following by rearranging the jumbled letters :
Plastics made of _______ are represented by resin code #6.
sytlopynere
