81. A first class brick when immersed in cold water for 24 hours should not absorb water more than
82. A good building stone should not absorb water more than
83. Basalt is
84. Age of a tree may be ascertained by
85. Which one of the following is an air binding material?
86. Bitumen felt
87. Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica
88. Blister steel
89. Cast iron contains carbon approximately
90. Steel contains carbon approximately
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