Synthetic Fibres and Plastics (Class - VIII)
Synthetic Fibers and Plastics
Questions
Which of the following polymers is not made by humans in an industrial process?
- Melamine
- Bakelite
- Nylon
- Acrylic
- Silk
Which of the following statements is/are false?
a. Cellulose is a polymer that is made up of a large number of small glucose molecules joined one after the other.
b. Wood contains a very less amount of cellulose polymer.
c. The small molecules that join together to form a polymer are called monomers.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
Which of the following man-made fibers is made from a natural material called cellulose?
- Polyester
- Rayon
- Nylon
- Acrylic
- None of these
Which of the following is not a property of nylon?
- Nylon is a thermoplastic polymer.
- Nylon fibers are fairly strong and elastic.
- Nylon fibers are lightweight and lustrous.
- It is cheaper than natural silk and can be woven like silk fiber.
- Nylon fibers absorb very little water.
Which of the following fiber threads is actually stronger than a steel wire of similar thickness?
- Wool
- Rayon
- Nylon
- Silk
- Acrylic
Which of the following statements is/are false?
a. Nylon is not attacked by moths and ordinary chemicals.
b. Rayon fiber is chemically identical to cotton, but it has a shine like silk.
c. Nylon fibers have low abrasion resistance, so they are very durable.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
Which of the following is not a characteristic of synthetic fibers?
- Synthetic fibers are very durable.
- Synthetic fibers absorb very little water.
- Synthetic fibers are wrinkle resistant.
- Synthetic fibers are extremely thick and strong.
- Clothes made from synthetic fibers are easier to maintain.
Polyester is a synthetic fiber in which the polymer units are linked by ester groups. Which of the following is not a property of polyester?
- Polyester fibers are weaker in strength than nylon fibers.
- Polyester fiber is not attacked by moths and ordinary chemicals.
- Polyester is a thermoplastic polymer.
- Polyester fibers are softer than nylon fibers.
- Polyester fiber is strong, wrinkle resistant and easy to wash
Which of the following is a fire-resistant plastic and is used to coat the uniforms of firemen?
- Teflon
- Melamine
- Bakelite
- PVC
- Polythene
Which of the following statements is/are false?
a. PET is naturally colourless with high transparency.
b. Terrycot is a mixture of acrylic and cotton, and terrywool is a mixture of acrylic and wool.
c. Nylon is made up of repeating units of a chemical called amide.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
Which of the following plastics is used for making electric switches, plugs and sockets?
- Polythene
- Polyvinyl chloride
- Melamine
- Teflon
- Bakelite
Which of the following arrangements is the correct order of fabrics in their decreasing strength?
- Polyester - Nylon - Silk - Cotton - Wool
- Nylon - Polyester - Silk - Cotton - Wool
- Wool - Nylon - Silk - Cotton - Polyester
- Polyester - Nylon - Cotton - Silk - Wool
- Polyester - Nylon - Silk - Wool - Cotton
Which of the following statements is/are false?
a. The articles made of thermoplastics cannot be recycled whereas that made of thermosetting plastics can be recycled.
b. A material that is not easily decomposed by natural processes is called non-biodegradable.
c. The manufacturing of rayon contributes to deforestation.
- Only a
- Both a and b
- Only b
- Both b and c
- Only c
A plastic that can be softened repeatedly by heating and can be moulded into different shapes again and again is called a thermoplastic. Which of the following plasctics are thermoplastics?
a. Polythene
b. Bakelite
c. PVC
d. Melamine
- Both a and b
- Both a and c
- Both a and d
- Both b and c
- Both b and d
In which of the following plastics are the long polymer chains cross-linked with one another?
- Acrylic
- Polyester
- Nylon
- Teflon
- Bakelite