1. Optic fibres are mainly used for ____________________.
[A]Food processing
[B]Communication
[C]Musical instruments
[D]Weaving
2. What is the major ingredient of leather?
[A]Nucleic Acid
[B]Polymer
[C]Collagen
[D]Carbohydrate
3. What is heated with natural rubber in vulcanisation?
[A]Sulphur
[B]Phosphorous
[C]Silicon
[D]Carbon
4. Wood is the main raw material for the manufacture of ____________.
[A]Gunpowder
[B]Paper
[C]Paint
[D]Ink
5. What do detergents used for cleaning clothes and utensils contain?
[A]Sulphonates
[B]Bicarbonates
[C]Bismuthates
[D]Nitrates
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