71. Plaster of Paris is obtained by calcining
72. Which of the following is a mineral?
73. Which of the following timbers is suitable for making sports goods?
74. Stones used for the construction of retaining walls must be
75. Invar contains
76. Calcination of iron ores is done
77. The size of mould for bricks, is generally kept
78. The foliated structure is very common in
79. The rocks formed by gradual deposition, are called
80. The specific gravity of marble, is
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