Building Materials
Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?

Alumina and iron
Silica and alkalies
Alkalies and magnesium
Lime stone and alumina

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

All of these
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
Tangentially to annual rings, is known as tangential method

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