Short-answer questions (30 words)
1. Why is nylon used for making parachutes?
2. Although rayon is a synthetic fibre, it is comfortable to wear in summers. Why?
3. Why synthetic clothes should not be worn while working in the kitchen?
4. Why is acrylic preferred over wool?
5. What is the advantage of coating utensils with Teflon?
6. Why are the handles of a pressure cooker made up of Bakelite!
Answers
Explanation:
1. Nylon is used as it has excellent wind resistance, good elasticity, mildew resistance, and is comparatively cheaper. The material is also lightweight and dries quickly. It is resistant to abrasion and chemicals.
2.Clothes made from rayon are very comfortable in summer because they can absorb sweat from the body.
3. because synthetic clothes can easily catch fire.
4.Acrylic can be used as a substitute for wool. It is a synthetic fibre. The wool obtained from natural fibres is quite expensive, whereas clothes made from acrylic are relatively cheap. ... Acrylic fabric are more durable and affordable which make it more popular than wool.
5.The main advantages of Teflon™ coating services are:
It is non-stick.
It is heat-resistant and cold-resistant.
It is chemical-resistant.
It has great electrical properties.
A wide range of products can be coated in Teflon™
It has an excellent service life, retaining its properties over a long period of time.
6.The handles of pressure cookers are made of plastic as they are bad insulators of heat. The handles are made of Bakelite, which is a thermo-setting plastic. It has heat resistant properties and is also an electrical insulator. If a metal handle was used, it would become red-hot as metals are good conductors of heat.