The thin radial fibres extending from the pith to the cambium layer is called medullary rays.

The percentage of alumina in a good brick clay should vary from

Poor or lean lime

For one cubic metre of brick masonry, the number of bricks required are

A first class brick should not absorb water more than

Lime is used

The addition of pozzolana to Portland cement causes

The compressive strength of ordinary cement is less than its tensile strength.

Which of the following statement is correct?