Answer:

QUESTION 1: Write some salient features of RAYON.

Answer: Some salient features of rayon are as follows:

• Rayon is similar to silk but is cheaper than silk. Hence, rayon is also called ‘poor MAN’s silk’.

• Rayon can be dyed in various colours.

• Rayon is usually mixed with cotton to make bedsheet and dress materials

Question 2: What are the characteristics of synthetic fibres?

Answer: Following are the characteristics of synthetic fibres:

• They are less expensive.They are readily available.

• They can be easily washed.

• They are easy to maintain.

Question 3: Plastic bags create which kinds of problems?

Answer: Following problems are created by plastic bags:

• Plastic bag keeps on accumulating in the environment.
• It chokes drains.

• A stray animal can die if it accidentally swallows plastic bag

Question 4: Write a short note on acrylic.

Answer: Acrylic resembles wool and hence is also called synthetic wool. It is cheaper and more durable than wool, and is easier to wash and maintain. Acryclic is less expensive, easily available, easy to wash and is easy to maintain.

Question 5:Explain different types of plastic and their usages.

Answer: Different types of plastic and their usages are as follows:

Thermoplastic: Some plastics easily get DEFORMED on heating, and can be easily bent and reshaped by heating. They are called thermoplastic. Polythene and PVC are examples of thermoplastic. Thermoplastic is used for making combs, toys, buckets, mugs, etc.

Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Such plastics are called thermosetting plastic. Bakelite and melamine are examples of thermosetting plastic. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Melamine is RESISTANT to fire and is hence used for making utensils.