71. Good quality sand is never obtained from
72. Water paint is a
73. A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
74. The commonly used lime in white washing, is
75. Plywood is made from
76. Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
77. Bitumen may be dissolved in
78. The percentage of alumina and silica in good fire clay vary respectively is
79. Due to attack of dry rot, the timber
80. Rapid hardening cement attains early strength due to
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