61. The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as
62. The most durable varnish is
63. The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called
64. The rocks which are formed due to cooling of magma at a relatively shallow depth from the earth's surface are called
65. The rocks which are formed due to pouring of magma at the earth's surface are called
66. Turpentine oil is used in paints as
67. Linseed oil is used in paints as
68. The pigment used in paints for corrosive resistance, is
69. The type of steel used for precision levelling staff, is
70. Veneering means
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