Materials Used in the Preparation of Substances like Soap, Glass, Ink, Paper, Cement, Paints, Safety Matches and Gun-Powder NDA Questions

NDA Chemistry

Materials Used in the Preparation of Substances like Soap, Glass, Ink, Paper, Cement, Paints, Safety Matches and Gun-Powder MCQ Questions


13.
Flint glass, used for making optical lenses and prisms because of its high refractive index, contains:
A.
Lead oxide
B.
Cerium oxide
C.
Boric oxide
D.
Magnesium oxide
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ANSWER :
A. Lead oxide
14.
Crooke's glass, which is used to make lenses that cut off ultraviolet radiation, contains:
A.
Antimony trisulphide
B.
Boric oxide
C.
Cerium oxide
D.
Lead oxide
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ANSWER :
C. Cerium oxide
15.
Coloured glass is generally obtained by fusing ordinary glass with small amounts of:
A.
Organic dyes only
B.
Sulphuric acid
C.
Metal oxides
D.
Sodium chloride
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ANSWER :
C. Metal oxides
16.
The addition of cobalt oxide to molten glass imparts which colour to the glass?
A.
Yellow
B.
Green
C.
Red
D.
Blue
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ANSWER :
D. Blue
17.
Quartz glass, valued for its high melting point and transparency to ultraviolet light, is made from:
A.
Silica and boric oxide
B.
Silica and lead oxide
C.
Silica and soda ash
D.
Pure silica alone
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ANSWER :
D. Pure silica alone
18.
Ordinary blue-black writing ink is essentially a solution of:
A.
Antimony trisulphide in glue
B.
Tannic acid, gallic acid and ferrous sulphate along with a dye
C.
Titanium dioxide in linseed oil
D.
Calcium carbonate in water
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ANSWER :
B. Tannic acid, gallic acid and ferrous sulphate along with a dye