The type of glass used in making lenses and prisms is
A). Jena glass
B). Soft glass
C). Pyrex glass
D). Flint glass
Soap is a mixture of sodium or potassium salts of
A). Dicarboxylic acids
B). Mono-carboxylic acids
C). Glycerol
D). Tricarboxylic acids
Gypsum is added to cement clinker to
A). Increase the tensile strength of cement
B). Decrease the rate of setting of cement
C). Facilitate the formation of colloidal gel
D). Bind the particles of calcium silicate
Paper is manufactured by
A). Wood and resin
B). Wood, sodium and bleaching powder
C). Wood, calcium, hydrogen sulphide and resin.
D). Wood and bleaching powder
The vast resources of unutilised natural gas can be used in the production of
A). Graphite
B). Synthetic petroleum
C). Fertilisers
D). Carbide