51. The drug 'Marijuana' is a
52. Heat resistant variety of glass is
53. The element which is used for vulcanising rubber
54. Polythene is polymer of
55. Glass is soluble in
56. A thick paste of cement, sand and water is called
57. Which of the following is used as filler in tyre of rubber?
58. Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes?
59. In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from
60. Which one of the flame is used by the Goldsmith to heat the gold?
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