(a)   1         2        3         4
     (b)   2         4        1         3
     (c)   3         1        4         2
     (d)   4         3        2         1
Ans: (c)
243. Match the following:
     List-I                   List-II
     (Name of Vitamin)        (Source)
     A. Thiamin               1. Cod-liver Oil
     B. Riboflavin            2. Honey
     C. Pyridoxine            3. Potato
     D. Retinol               4. Wheat
           A         B        C         D
     (a)   4         3        2         1
     (b)   1         2        3         4
     (c)   4         1        2         3
     (d)   1         3        4         2
Ans: (a)
244. Invert sugar is
     (a) sucrose
     (b) glucose
     (c) fructose
     (d) a mixture of glucose and fructose
Ans: (d)
245. Cholesterol is
     (a) a carbohydrate
     (b) a protein
     (c) a lipid
     (d) a hormone
Ans: (c)
246. The main element used in the vulcani-sation of rubber is
     (a) nickel
     (b) copper
     (c) sulphur
     (d) graphite
Ans: (c)
247. Concrete is a mixture of
     (a) cement an limestone
     (b) cement and sand
     (c) cement and gravel
     (d) cement, sand and gravel
Ans: (d)
248. Vulcanisation was discovered by
     (a) Goodyear
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