Building Materials
The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called

Igneous rocks
Volcanic rocks
Plutonic rocks
Hypabyssal rocks

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts
All listed here

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Building Materials
Cast iron

Is obtained by purifying pig iron
May contain 2 to 5 per cent of carbon with other impurities
Is manufactured in required shapes
All listed here

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