Last updated on February 6th, 2024 at 12:55 am
CG Board Class 8 Synthetic Fibres & Plastics
Chhattisgarh Board Class 8 Science Chapter 2 Solution Textbook question and answers as well as extra question and answers from the chapter
Choose the correct answer-
(i) Synthetics fibres are –
- (a) Fibres obtained from plants.
- (b) Fibres obtained from animals.
- (c) Fibres made from chemicals [answer]
- (d) All the above
(ii) The type of plastic used in making combs is –
- (a) Thermosetting plastic
- (b) Thermoplastic [answer]
- (c) (a) and (b) both
- (d) Neither (a) nor (b)
(iii) Clothes of firemen are made from –
- (a) Teflon
- (b) Melamine
- (c) Bakelite
- (d) Thermoplastic [answer]
Artificial silk is –
- (a) Nylon
- (b) Polyester
- (c) Rayon [answer]
- (d) Acrylic
(v) PET is
- (a) Nylon
- (b) Polyester [answer]
- (c) Rayon
- (d) Acrylic
Match the terms of column A correctly with the given in column B
A B
Rayon used in — making parachutes and ropes
Nylon fabrics — do not wrinkle easily
Thermoplastic made — from wood pulp
Polyester can’t be — moulded upon heating
Thermosetting plastic — can be moulded easily by heating
Q- Name any three objects made from nylon that shows its strength.
A- Three objects made from nylon that showcase its strength are:Parachutes, Ropes, Socks.
Q- Why PET containers are preferred to store food items?
A – PET containers are preferred to store food items because PET (Polyethylene Terephthalate) is a food-grade plastic that is safe for storing beverages and food. PET containers are lightweight, transparent, and resistant to odors and flavors. Additionally, PET is recyclable, making it an environmentally friendly choice for packaging.
Additional Question and Answers
Q: What are natural fibers?
A: Natural fibers are materials obtained from plants or animals, used to make fabrics. Examples include cotton, silk, and wool.
Q: Name three synthetic fibers.
A: Rayon, nylon, and polyester are examples of synthetic fibers.
Q: Why are clothes made from synthetic fibers considered durable?
A: Clothes made from synthetic fibers, such as polyester, are durable because they resist wrinkles, dry quickly, and do not require frequent ironing.
Q: What is ‘zari work’ on clothes, and what is it made of?
A: ‘Zari’ refers to thin wires of copper coated with gold or silver, used for decorative work on clothing during special occasions.
Q: What is the main characteristic of synthetic fibers like nylon when heated?
A: Synthetic fibers like nylon melt on heating, which can be a disadvantage, especially if they catch fire.
Q: Why are PET containers preferred for storing food items?
A: PET (Polyethylene Terephthalate) containers are preferred for storing food items due to their safety, transparency, resistance to odors and flavors, lightweight nature, and recyclability.
Q: What is the difference between thermoplastic and thermosetting plastics?
A: Thermoplastics can be softened and reshaped upon heating, while thermosetting plastics harden irreversibly when heated and cannot be reshaped.
Q: Why are electrical switches made from thermosetting plastics?
A: Electrical switches are made from thermosetting plastics, such as bakelite, due to their excellent electrical insulating properties, heat resistance, durability, moldability, and flame resistance.
