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Synthetic Fibres and Plastics — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Synthetic Fibres and Plastics MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — easy
Which plastic can be softened again on heating and remoulded?
A. Bakelite
B. Melamine
C. Polythene ✓ Correct
D. Thermosetting plastic
Solution: Polythene is a thermoplastic and softens on heating.
Q2 — easy
Plastics that do not decompose easily in nature are called:
A. biodegradable
B. non-biodegradable ✓ Correct
C. organic
D. edible
Solution: They are not broken down by natural processes.
Q3 — easy
Which fibre is obtained from a plant?
A. Nylon
B. Polyester
C. Cotton ✓ Correct
D. Acrylic
Solution: Cotton comes from the cotton plant.
Q4 — hard
Which practice best reduces plastic pollution?
A. Burning plastic waste
B. Burying all plastics
C. Following reduce, reuse and recycle ✓ Correct
D. Throwing plastics in rivers
Solution: The 4R approach cuts plastic waste at source.
Q5 — hard
Rayon is called a semi-synthetic fibre because it is made from:
A. petroleum only
B. natural wood pulp treated with chemicals ✓ Correct
C. animal protein
D. pure minerals
Solution: Cellulose from wood pulp is chemically processed.
Q6 — hard
Why are plastic containers preferred for storing chemicals?
A. They are cheap only
B. They are unreactive and do not corrode ✓ Correct
C. They are heavy
D. They conduct heat well
Solution: Plastics do not react with most chemicals.
Q7 — medium
Bakelite is used for electrical switches because it is a poor conductor of:
A. sound
B. heat and electricity ✓ Correct
C. light
D. water
Solution: Bakelite resists heat and electricity.
Q8 — medium
Terrycot is a fabric made by mixing:
A. terylene and cotton ✓ Correct
B. terylene and wool
C. cotton and silk
D. nylon and jute
Solution: The name combines terylene and cotton.
Q9 — medium
Why should we avoid wearing synthetic clothes while working in a kitchen?
A. They are costly
B. They melt and stick to the body on catching fire ✓ Correct
C. They absorb water
D. They tear easily
Solution: Synthetic fibres melt and can cause severe burns.