Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Organic Chemistry

_______ was the first synthetic fibre created by humans.

1

Polyester

2

Nylon

3

Rayon

4

More than one of the above

5

None of the above

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