Class 8 chemistry MCQs with answers are provided here for Chapter 3, Synthetic Fibres and Plastics. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 8 chemistry syllabus. By practising these Class 8 multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 8 annual examinations as well as other competitive exams.
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Class 8 Synthetic Fibres and Plastics MCQs
1. _______ is known as artificial silk.
a) Rayon
b) Nylon
c) Polyester
d) None of the above
Answer: a
2. Which of the following is the most potent synthetic fibre?
a) Rayon
b) Nylon
c) Polyester
d) None of the above
Answer: b
3. Which of the following is made from wood pulp?
a) Rayon
b) Nylon
c) Polyester
d) None of the above
Answer: a
4. Which of the following is used to obtain nylon?
a) Air
b) Coal
c) Water
d) All of the above
Answer: d
Explanation: Nylon is the first completely artificial fibre obtained from air, coal and water. It is synthesised without using any biological raw material.
5. Which of the following is caused by plastic burning?
a) Water pollution
b) Sound pollution
c) Air pollution
d) All of the above
Answer: c
Explanation: Plastic burning causes air pollution by releasing poisonous gases into the environment. It also emits soot contributing to weather change.
6. Choose a biodegradable substance.
a) Thermoplastic
b) Thermosetting plastic
c) PVC pipes
d) None of the above
Answer: d
Explanation: Substances that can be degraded by natural facets like fungi, bacteria, temperature and oxygen are known as biodegradable substances. Thermoplastic, thermosetting plastic and PVC pipes can not be degraded by natural facets and therefore are classified as non-biodegradable substances.
7. Why do we use plastic containers for storing food?
a) They are strong
b) They are durable
c) They are light in weight
d) All of the above
Answer: d
Explanation: We use plastic containers for storing food because they are strong, durable, light in weight and easy to handle.
8. Why are the applications of plastics in the medical industry?
a) Stitching wounds
b) Manufacturing gloves
c) Packing tablets
d) All of the above
Answer: d
Explanation: Plastic is used in the medical industry for the following.
1. Manufacture thread for stitching wounds.
2. Manufacture instruments like gloves and syringes.
3. Packing tablets
9. Which of the following is a synthetic fibre?
a) Jute
b) Nylon
c) Wool
d) None of the above
Answer: b
Explanation: Nylon is a synthetic fibre manufactured without using any natural raw material.
10. _______ is used to manufacture rayon.
a) Wool
b) Wood pulp
c) Silk
d) None of the above
Answer: b
Explanation: Rayon is synthesised by the chemical treatment of the cellulose found in the wood pulp.
11. How is cotton comparable to artificial silk?
a) They are cellulose polymer
b) They melt on heating
c) Both (a) and (b)
d) None of the above
Answer: a
Explanation: Cotton and artificial silk (rayon) are synthesised by cellulose chemical treatment and referred to as cellulose polymers.
12. Polycot is synthesised by combining _______ and ______.
a) Polymer and cotton
b) Polyester and cotton
c) Polygon and cotton
d) None of the above
Answer: b
Explanation: Polycot is synthesised by combining polyester and cotton.
13. Which of the following is a thermosetting plastic?
a) Silicones
b) Vulcanised rubber
c) Polyester
d) All of the above
Answer: d
Explanation: A plastic which, when once moulded, cannot be softened and moulded again is known as thermosetting plastic. Silicones, vulcanised rubber and polyester are examples of thermosetting plastics.
14. Which of the following is used to make handles of utensils?
a) Polyvinyl chloride
b) Bakelite
c) Both (a) and (b)
d) None of the above
Answer: b
Explanation: Bakelite is used to make handles of utensils as it is a thermosetting plastic, i.e. it does not soften up and conduct heat.
15. PET is the abbreviation of ________.
a) Polyethylene terpenoid
b) Polyethyl terpenoid
c) Polyethylene terephthalate
d) None of the above
Answer: c
16. PVC is the abbreviation of _______.
a) Polyvinyl chloride
b) Polyvenyl chloride
c) Polyoxyvinyl chloride
d) None of the above
Answer: a
17. Rayon shows properties similar to ______.
a) Jute
b) Cotton
c) Silk
d) None of the above
Answer: c
Explanation: Rayon shows properties similar to silk and is also referred to as artificial silk.
18. Which of the following is thermoplastic?
a) Polyethene
b) Teflon
c) Polyvinyl chloride
d) All of the above
Answer: d
19. Which of the following is obtained from petroleum?
a) Polyester
b) Jute
c) Nylon
d) None of the above
Answer: a
Explanation: Polyester is a robust fibre that soaks very little water and is synthesised from petroleum products.
20. PET is a ______.
a) Polyamide
b) Polyester
c) Both (a) and (b)
d) None of the above
Answer: b
Explanation: PET is a polyester. It is the abbreviation of Polyethylene terephthalate. It is moulded into plastic bottles and receptacles for packaging foods and other custom products.
Read Also:
- Synthetic Fibres
- Synthetic Fibres and Natural Fibres
- Natural Polymers
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