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

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

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Building Materials
Assertion A : Pure lime takes a long time to develop adequate strength.Reason R : Pure lime has slow hardening characteristics.Select your answer according to the coding system given below:

Both A and R is true and R is correct explanation of A
A is true but R is false
Both A and R is true and R is not a correct explanation of A
A is false but R is true

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

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
All listed here
No grey or white deposits appear on the surface, the brick is free from soluble salts

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