46: Which of the following crops has the highest photosynthetic activity?
(a) Cotton
(b) Sugarcane
(c) Rice
(d) Wheat
47: Paraffin is a by-product of
(a) Petroleum refining
(b) Processing of agricultural wastes
(c) Cottage industries involving beekeeping
(d) Leather industry
48: Who introduced the Civil Services in India?
(a) Lord Dalhousie
(b) Lord Curzon
(c) Lord Wellesley
(d) Lord Cornwallis
49: Which number will continue the following series?
3, 8, 15, 24, 35, 48, 63, 80,........
(a) 92
(b) 99
(c) 91
(d) 87
50: Which one of the following elements is essential for the construction of nuclear reactors ?
(a) Cobalt
(b) Nickel
(c) Zirconium
(d) Tungsten