Chemical Process
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.

< 10
50
> 30
75

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Chemical Process
Vulcanisation of rubber

Converts its plasticity into elasticity
Decreases its tensile strength
Increases its ozone & oxygen reactivity
Increases its oil & solvent resistance

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All of these

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