Axles are made by heating rods of iron embedded in charcoal powder. This process is known as :

tempering

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annealing

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case hardening

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hardening

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Solution

The correct option is B case hardening
Option C is correct.
Case hardening (also known as surface hardening) is used in making of axels. This process is used to form a thin layer of harden metal that is called case. It is also used to harden element contents of bars that will be used for pattern welding.

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Charcoal is produced by slow heating of biomass(wood generally) in absence of oxygen. How does this process make charcoal a better biomass than wood?

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