31. Asphalt is obtained from
32. The normal curing period for lime mortar, is:
33. Glazing is used to make earthenware
34. Pug mill is used for
35. A pug mill is used for
36. The nominal size of the modular brick is
37. Clay and silt content in a good brick earth must be at least
38. The initial setting time for ordinary Portland cement as per IS specifications should not be less than
39. According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than
40. Crushing strength of a first class brick should not be less than
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