The characteristics of different fibres are listed as
W: I am strong, elastic, light and burn slowly. I shrink on heating and form hard beads with smell of burning hair.

X : I burn completely leaving no residue.

Y : I can be woven like silk fibres and dyed in a wide variety of colours. I burn quickly with a smell of burning paper.

Z : I do not get wrinkled easily. I burn slowly and produce black smoke.

W, X, Y and Z are respectively:

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Bakelite, nylon, rayon and cotton

Terylene, rayon, cotton and nylon

Melamine, PVC, nylon and rayon

Nylon, cotton, rayon and polyester

answer is D.

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Detailed Solution

Nylon: I am strong, elastic, light and burn slowly. I shrink on heating and form hard beads with smell of burning hair.

Cotton : I burn completely leaving no residue.

Rayon : I can be woven like silk fibres and dyed in a wide variety of colours. I burn quickly with a smell of burning paper.

Polyester : I do not get wrinkled easily. I burn slowly and produce black smoke.

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