Engineering Materials
The molecules in a solid move

Back and forth like tiny pendulums
In a haphazard way
In a random manner
In circular motion

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Engineering Materials
Pick up wrong statement about wrought iron

It melts at 1535°C
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It is very soft and ductile
It contains carbon of the order of 0 to 0.25%

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Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

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