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____________________ mortar is waterproof and consists of some quantity of pulverized alum.

(a) Water proof

(b) Hump

(c) Cement

(d) Lime

I got this question during a job interview.

My doubt stems from Mortar for Plastering in portion Pointing and Plastering of Construction & Building Materials

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Correct choice is (a) Water proof

To explain I would say: Water proof mortar is waterproof and it is prepared by mixing one part of cement, two parts of sand and pulverized alum at the rate of 120 Newton per metre cube of sand. In the water to be used to, 0.75 Newton of soft soap is dissolved for one litre of water and this soap water is added to the dry mix.

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