81. Epoxy resins are used as
(a) detergents
(b) insecticides
(c) adhesives
(d) moth repellents
82. Which type of fire extinguisher is used for petroleum fire?
(a) Powder type
(b) Liquid type
(c) Soda acid type
(d) Foam type
83. Which is/are the important raw material(s) required in cement industry?
(a) Gypsum and Clay
(b) Clay
(c) Limestone and Clay
(d) Limestone
84. The element common to all acids is
(a) hydrogen
(b) carbon
(c) sulphur
(d) oxygen
85. Tetraethyl lead is used as
(a) pain killer
(b) fire extinguisher
(c) mosquito repellent
(d) petrol additive
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