61. Which of the following stone is best suited for construction of piers and abutments of a railway bridge?
62. Acrylic sheets
63. Wrought iron contains carbon about
64. The usual percentages of clay and metal in cermet are:
65. Good quality stones must
66. Spalling hammer is used for
67. In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is
68. Chemically, marble is known as
69. Geologically, marble is known as
70. The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:
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