41. Which of the following is not vitamin?
(a) Trypsin
(b) Ascorbic acid
(c) Riboflavin
(d) None of These
42. Which of the following is not the color in rainbow?
(a) Black
(b) Blue
(c) Indigo
(d) Violet
43. Bronze is an alloy of
(a) Copper and Zinc
(b) Tin and Zinc
(c) Copper and Tin
(d) Iron and Zinc
44. Caustic soda is
(a) Na2CO3
(b) NaHCO3
(c) NaOH
(d) NaCl
45. Pure gold is
(a) 17 carat
(b) 24 carat
(c) 20 carat
(d) 36 carat
46. Which of the following is a fastest growing tree?
(a) Teak
(b) Sal
(c) Eucalyptus
(d) Banyan
47. Radioactivity was discovered by
(a) Henry Becquerel
(b) Marie Curie
(c) Newton
(d) Einstein
48. One horsepower is equal to
(a) 736 watts
(b) 746 watts
(c) 748 watts
(d) 756 watts
49. Which of the following is not elastic?
(a) Glass
(b) Steel
(c) Rubber
(d) Sponge
50. When ice melts into water, its
(a) Volume Increases
(b) Volume decreases
(c) Mass Increases
(d) Mass decreases