The compressive strength of second elass bricks should bot be less than

The soundness of cement is tested by

The rocks formed due to solidification of molten mass laying below or above the earth surface, are called

The time required for air seasoning of soft wood is

Efflorescence is caused if

The slaking of moderately hydraulic lime is scarcely noticeable.

Which of the following is an example of silicious rock?

Marble is an example of

The percentage of the slag component of Portland-slag cement varies from