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PYQ 1200 Q/A Part - 1
PYQ 1200 Q/A Part - 2
PYQ 1200 Q/A Part - 3
PYQ 1200 Q/A Part - 4
PYQ 1200 Q/A Part - 5
Kerala PSC General Science Book Study Materials Page 349
Book's First Page(b) ethane (c) ethylene (d) acetylene Ans: (d) 190. The gas used in the weldings of the metallic joints is : (a) ethylene (b) acetylene (c) propylene (d) methane Ans: (b) 191. Which one among the following is a source of methane emission into the atmosphere? (a) Automobile exhaust fume (b) Industrial chimney (c) Mining (d) Wetland Ans: (d) 192. The toxic gas lewisite used in the war is prepared by : (a) chlorine (b) ammonia (c) acetylene (d) nitrobenzene Ans: (c) 193. The element which has maximum number of isotopes is : (a) Bismuth (b) Nickel (c) Lead (d) Polonium Ans: (d) 194. Which of the following chemically predominants in the silk fibres? [CDS 2010] (a) Protein (b) Carbohydrate (c) Complex lipid (d) Mixture of polysaccharide and fat Ans: (b) 195. The chloroform is kept in the coloured bottle (container) because it directly reacts with air and light and forms a toxic substance which is: (a) phosphin (b) phosgene (c) mustard gas (d) CO Ans: (b) 196. The carbon tetrachloride is also known as : (a) marsh gas (b) mustard gas (c) pyrin (d) pyrole Ans: (c) 197. The fire extinguisher used in the electric firing is: (a) pyrin extinguisher (b) foam (leather) extinguisher (c) water extinguisher (d) soda acid extinguisher Ans: (a) 198. Which of the following is also known as wood spirit: (a) methyl alcohol (b) ethyl alcohol (c) ethylene glycol (d) glycerol Ans: (a) 199. The antifreezer is a mixture of : (a) acetic acid and water 348