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Building Materials - Engineering

Q1:

Pick up the rock which is not a sedimentary rock from the following:

A gravel

B sand stone

C gypsum

D dolerite

E lignite.

ANS:D - dolerite

Lignite, often referred to as brown coal, is a soft brown combustible sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content. It has a carbon content around 60-70 percent. So dolerite is correct answer.