CG SCERT (Chhattisgarh Board) Class 8 Science & Technology Solutions | 2026-27 Official Edition
Welcome to the complete, 100% textbook-grounded CG Board Class 8 Science Chapter 2 Solutions: Synthetic Fibres and Plastics (संश्लेषित रेशे और प्लास्टिक) in Bilingual Format (English Medium + हिंदी माध्यम). Every in-text question (Answer these / इनके उत्तर दीजिए) and end-of-chapter exercise (Exercises / अभ्यास के प्रश्न) has been solved strictly from the official 2026-27 SCERT Chhattisgarh Raipur textbook.
End-of-Chapter Exercises (Solutions)
अभ्यास के सभी प्रश्नों के हल
i
संश्लेषित रेशे होते हैं a पौधों से प्राप्त…
Synthetic fibres are
(a) Fibres obtained from plants
(b) Fibres obtained from animals
(c) Fibres made from chemicals
(d) All the above
(c) Fibres made from chemicals / (c)
ii
कंगी बनाने में किस प्रकार के प्लास्टिक का…
The type of plastic used in making combs is
(a) Thermosetting plastic
(b) Thermoplastic
(c) (a) and (b) both
(d) Neither (a) nor (b)
(b) Thermoplastic / (b)
iii
अग्निशामकों अग्निशामक कर्मचारियों के कपड़े बने होते हैं…
Clothes of firemen are made from
(a) Teflon
(b) Melamine
(c) Bakelite
(d) Thermoplastic
(b) Melamine / (b)
iv
कृत्रिम रेशम Artificial silk है a नायलॉन b…
Artificial silk is
(a) Nylon
(b) Polyester
(c) Rayon
(d) Acrylic
(c) Rayon / (c)
v
PET है a नायलॉन b पॉलिएस्टर c रेयॉन…
PET is
(a) Nylon
(b) Polyester
(c) Rayon
(d) Acrylic
(b) Polyester / (b)
s Column
s Column
| Column A | Column B |
|---|---|
| 2. Nylon | fabrics do not wrinkle easily |
| 3. Thermoplastic | made from wood pulp |
| 4. Polyester | can’t be moulded upon heating |
| 5. Thermosetting plastic | can be moulded easily by heating |
| Column A | Column B |
| *1. Rayon | made from wood pulp |
| *2. Nylon | used in making parachutes and ropes |
| *3. Thermoplastic | can be moulded easily by heating |
| *4. Polyester | fabrics do not wrinkle easily |
| *5. Thermosetting plastic | can’t be moulded upon heating |
Answer Table:
Answer the following questions
नायलॉन से बनी ऐसी तीन वस्तुओं के नाम…
Name any three objects made from nylon that shows its strength.
Nylon thread is exceptionally strong, elastic, and light; a single nylon thread is actually stronger than a steel wire of comparable thickness. Three objects made from nylon that demonstrate its high mechanical strength are
Question 8
खाद्य पदार्थों का भंडारण करने के लिए PET…
Why PET containers are preferred to store food items?
PET (Polyethylene Terephthalate) is a widely used form of polyester. PET bottles and containers are preferred over traditional glass or metal containers for storing food items, water, and pickles due to the following reasons
- Chemical Non-reactivity: PET is non-reactive and does not react with water, food constituents, or mild organic acids present in pickles, ensuring food safety.
- Lightweight and Shatterproof: PET containers are light in weight, highly durable, and unbreakable compared to fragile glass jars.
- Moisture-proof and Clear: They provide a strong barrier against external moisture, keeping stored food crisp and clean while offering transparent visibility.
Question 9
संश्लेषित रेशों का निर्माण वनों के संरक्षण में…
Manufacturing of synthetic fibres has a beneficial role in conservation of forests. Explain.
Natural fibres like cotton, linen, and jute are derived from plants, requiring extensive deforestation and agricultural land clearings. Furthermore, obtaining Rayon (artificial silk) requires large quantities of wood pulp, which is obtained by cutting down millions of forest trees.
On the other hand, fully synthetic fibres like Nylon, Polyester, and Acrylic are synthesized chemically using petrochemicals without utilizing raw materials derived from plants or trees. By substituting natural timber-derived materials and natural plant fibres with synthetic fibres, the demand for cutting down forest trees is significantly reduced. Therefore, the manufacturing and widespread adoption of synthetic fibres play a vital and beneficial role in the conservation of forests.