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

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

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Building Materials
Putty is

All listed here
Made with finely powdered chalk and linseed oil
Softened by a solution of pearl ash and quick-lime soaked in water
Used for fixing glass panes

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Building Materials
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting.Reason R : Turpentine oil is costlier than other thinners.Select your answer according to the coding system given below:

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

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