41. The most important tool in brick laying for lifting and spreading mortar and for forming joints is
42. French polish is
43. If the iron ore contains clay as an impurity, the flux added during calcination, is
44. Rapid hardening cement contains
45. The amount of water used for one kg of distemper is
46. Granite is not suitable for ordinary building purpose because
47. The frog of the brick in a brick masonry is generally kept on
48. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
49. Gypsum is a
50. Excess of alumina in brick earth makes the brick
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