General Science – Exercise – 3

136. Paper is manufactured by

(a) Wood and resin
(b) Wood, sodium and bleaching powder
(c) Wood, calcium, hydrogen sulphite and resin
(d) Wood and bleaching powder

137. Soap is a mixture of sodium or potassium salts of

(a) dicarboxylic acids
(b) monocarboxylic acids
(c) glycerol
(d) tricarboxylic acids

138. The type of glass used in making lenses and prisms is

(a) jena glass
(b) soft glass
(c) pyrex glass
(d) flint glass

139. The vast resources of unutilised natural gas can be used in the production of

(a) graphite
(b) Synthetic petroleum
(c) fertilisers
(d) carbide

140. Deep blue colour is imparted to glass by the presence of

(a) cupric oxide
(b) nickel oxide
(c) cobalt oxide
(d) iron oxide

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