Shaktimatha CBSE Learning

Class 8 Science – Chapter 3
Synthetic Fibres and Plastics
MCQs (Exam Level)

Which of the following is a natural fibre?
a) Nylon b) Rayon c) Cotton d) Polyester
Answer: c) Cotton
The first fully synthetic fibre is:
a) Rayon b) Nylon c) Polyester d) Acrylic
Answer: b) Nylon
Which fibre is known as artificial silk?
a) Nylon b) Polyester c) Rayon d) Acrylic
Answer: c) Rayon
Which plastic cannot be recycled?
a) Thermoplastic b) Polythene c) PVC d) Thermosetting plastic
Answer: d) Thermosetting plastic
Which of the following is a thermosetting plastic?
a) PVC b) Bakelite c) Polythene d) Nylon
Answer: b) Bakelite
Why are plastics used to make electrical switches?
a) They conduct electricity b) They are shiny c) They are poor conductors of electricity d) They melt easily
Answer: c) They are poor conductors of electricity
Which fibre is used to make sweaters?
a) Nylon b) Rayon c) Acrylic d) Polyester
Answer: c) Acrylic
Plastics are non-biodegradable because:
a) They dissolve in water b) Microorganisms cannot decompose them c) They are heavy d) They are flexible
Answer: b) Microorganisms cannot decompose them
Which property makes plastics useful for making containers?
a) Fragile b) Conduct heat c) Lightweight and durable d) Absorb water
Answer: c) Lightweight and durable
Which of the following is correct about plastics?
a) They are biodegradable b) They catch fire easily c) They are corrosion resistant d) They conduct electricity
Answer: c) They are corrosion resistant

⭐ Practice MCQs daily to score full marks in science exams!