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PYQ 1200 Q/A Part - 1
PYQ 1200 Q/A Part - 2
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PYQ 1200 Q/A Part - 4
PYQ 1200 Q/A Part - 5
Kerala PSC General Science Book Study Materials Page 383
Book's First Page141. Non-stick cooking utensils are coated with: [I. Tax Central Excise 1993] (a) black paint (b) PVC (c) teflon (d) Polystyrene Ans: (c) 142. Permanent hardness of water can be removed by adding: [NDA 1991] (a) potassium permanganate (b) chlorine (c) bleaching powder (d) washing soda Ans: (d) 143. Which of the following is not correctly matched? [NDA 1993] (a) Galena: Lead sulphide (b) Green vitriol: Copper sulphate (c) Plaster of Paris: Calcium sulphate (d) Calomel: Mercurous chloride Ans: (b) 144. The formula of plaster of paris is: (a) CaSO2 (b) CaSO4 . 2H2O (c) 2CaSO4 . 4H2O (d) 2CaSO4 . H2O Ans: (d) 145. Which of the following substances is a bad conductor of electricity but a good conductor of heat? [RRB1993] (a) Asbestos (b) Celluloid (c) Purspecks (d) Mica Ans: (d) 146. Which of the following pairs does not contain a coinage metal? [CDS 1990] (a) Copper and Gold (b) Silver and Gold (c) Zinc and Gold (d) Copper and Silver Ans: (c) 147. Which of following is an element? [IAS 1992] (a) Ruby (b) Sapphire (c) Emerald (d) Diamond Ans: (d) 148. Most soluble in water is : (a) camphor 382