51. The plywood . . . . . . . .
52. The type of arch generally constructed over a wooden lintel or over a flat arch for the purpose of carrying the load of the wall above is
53. The constituent of cement which is responsible for all the undesirable properties of cement is
54. The main constituent of cement which is responsible for initial setting of cement is
55. Three basic raw materials which are needed in large quantities for production of steel are
56. Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a
57. The compound of Portland cement which contributes to the strength after two to three years is
58. After storage, the strength of cement
59. Bitumen emulsion is
60. The steel used for the manufacture of rails, is
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