51. The substance that can be used as a hypnotic: Answer: Barbituric acid
52. The ‘fixing agent’ used in photograhic film is:
Answer: Sodium thiosulphate
53. The maximum concentration of ozone is found in the:
Answer: Stratosphere
54. The Halogen which is used as an antiseptic:
Answer: Iodine
55. The lightest noble gas:
Answer: Helium
56. Cetane number is used to rate:
Answer: Diesel
57. Plaster of Paris is prepared by heating:
Answer: Gypsum
58. The heaviest of Alkaline earth metals:
Answer: Radium
59. Which metal foil is used for packing chocolates, medicines, cigarettes etc?
Answer: Aluminium
60. As per Avogadro’s hypothesis, equal volume of different gases at the same temperature
and pressure contain equal number of:
Answer: molecules
61. The element with the largest number of isotopes:
Answer: Tin
62. Which property of copper and aluminium makes them suitable for making cooking utensils and boilers?
Answer: High thermal conductivity
63. Silver objects turn dark on prolonged exposure to air due to the formation of:
Answer: Silver sulphide
Answer:
64. In which type of rocks petroleum is found?
Answer: Sedimentary
65. The green coating on the surface of copper objects kept exposed to moist air is due to the formation of:
Answer: Basic copper carbonate
66. What is the full form of P.V.C.?
Answer: Poly Venyl Chloride
67. Hydrogen in liquid form is used as:
Answer: rocket fuel
68. In which form cooking gas is supplied cylinders for domestic consumption?
Answer: Liquid
69. The process used in dairies to separate cream from milk is:
Answer: Centrifugation
70. Radio Carbon dating was discovered by:
Answer: Willard Franck Libby
71. Development of unpleasant smell and taste in oil and fat containing food items
due to oxidation of atmospheric oxygen is called:
Answer: Rancidity
72. An anti-oxidant often added to fat containing foods to prevent rancidity:
Answer: Butyrated hydroxi anisole
73. The most abundant type of coal:
Answer: Bituminous
74. Pigments obtained from plants can be separated by:
Answer: Chromatography
75. Which is called the ‘Mother of Pearl’?
Answer: Nacre
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