Question

Which constituent of good brick earth added in small quantity during the manufacturing of bricks, to give a yellow tint to bricks and decrease shrinkage?

1. Magnesia
2. oxide of iron
3. Silica
4. Alumina

Answer 1

Correct Answer - Option 1 : Magnesia

Explanation:

Good Brick Earth Constituents table:

Constituents	Percentage	Properties Impart	Excess causes
Alumina	20 - 30	Plasticity	Shrinking and warping
Silica	50 - 60	Uniform shape	Makes brick Brittle
Lime	4 - 5	Prevent cracking and shrinkage	Causes the bricks to melts.
Oxide of Iron	5 - 6	Imparts red-brown color and strength.	Makes bricks dark blue and blackish.
Magnesia	< 1	Yellow tint color to brick.	Decay of brick.