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

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

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Building Materials
Pick up the correct statement from the following: Method of sawing timber

All of these
Tangentially to annual rings, is known as tangential method
Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing
In four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method

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