(b) heating above 100°C
(c) passing an electric current
(d) just keeping it for 10 minutes
Ans: (b)
263. Contact lenses are made from [CDS 2011]
(a) polyvinyl chloride
(b) polystyrene
(c) Lucite
(d) Teflon
Ans: (c)
264. Which one among the following metals is used for making boats because it does not corrode by seawater? [CDS 2011]
(a) Tungsten
(b) Nickel
(c) Antimony
(d) Titanium
Ans: (d)
265. Which one among the following is a strong smelling agent added to LPG cylinder to help in the detection of gas
leakage? [CDS 2011]
(a) Ethanol
(b) Thioethanol
(c) Methane
(d) Chloroform
Ans: (b)
266. Which type of glass is used for making glass reinforced plastic? [CPO (SI) 2010]
(a) Pyrex glass
(b) Flint glass
(c) Quartz glass
(d) Fibre glass
Ans: (c)
267. Identify the metal which is non-toxic in nature [SSC(10+2) 2010]
(a) Chromium
(b) Gold
(c) Cadmium
(d) Cobalt
Ans: (b)
268. A powerful eye irritant present in smog is [SSC(10+2) 2010]
(a) nitric oxide
(b) sulphur dioxide
(c) peroxyacetyl nitrate
(d) carbon dioxide
Ans: (b)
269. "Which one among the following is not a property of salt? [NDA 2010]
(a) Salts have ordered packing arrangements called lattices
(b) Salts have low melting points but high boiling points
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