Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as :

tempering

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case hardening

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sherardising

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annealing

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Solution

The correct option is C annealing
Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as Annealing.

Annealing is a heat process whereby a metal is heated to a specific temperature /colour and then allowed to cool slowly.

This softens the metal which means it can be cut and shaped more easily.

Hence the correct option is D.

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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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