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PYQ 1200 Q/A Part - 1
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Kerala PSC General Science Book Study Materials Page 364
Book's First Page(d) Limestone and clay Ans: (d) 50. Which synthetic fibre is known as artificial silk? (a) Cotton (b) Rayon (c) Terylene (d) Nylon Ans: (b) 51. The major ingredient of leather is : [IAS 1988] (a) carbohydrate (b) collagen (c) polymer (d) nucleic acid Ans: (b) 52. In the manufacturing of safety matches, which of the following materials are used to coat the two sides of match boxes? [NDA 1992] 1) Yellow phosphorus 2) 2.Glue 3) Glass powder 4) Red phosphorus (a) 1, 2 and 3 (b) 1, 3 and 4 (c) 1, 2 and 4 (d) 2, 3 and 4 Ans: (c) 53. Glass is made of the mixture of: [LIC 1993] (a) quartz and mica (b) sand and salt (c) sand and silicates (d) None of the above Ans: (c) 54. Which of the following are true regarding a catalyst? [CDS 1992] Wrong Question 1) It is a substance which increases the rate of reaction. 2) It is a substance which reduces the activation energy. 3) It is substance which is consumed in the reaction. (a) 1 and 2 (b) 2 and 3 (c) 3 and 4 (d) 1 and 4 Ans: (a) 55. The chemical used as a "fixer" in photography is : [IAS 1995] (a) borax (b) sodium thiosulphate (c) sodium sulphate 363