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

The commonly used extender in a paint is

The greater the percentage of tri-calcium silicate in the cement, the better will be the cement.

Seasoning of tunber

The fuel generally used for burning limestone is

During the process of burning limestone, clay forms certain compound which

Which of the following statement is correct?

The central part of a tree is called

The best primer used for structural steel work is