106 .The use of heat treatment of ore that includes smelting and roasting is termed:
A.  electrometallurgy
B.  Cryometallurgy
C.  Hydrometallurgy
D.  Pyrometallurgy
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107 .Annealing process is -
A.  heating the steel bright red and then cooling slowly
B.  heating the steel to a temperature much below redness and cooling it slowly
C.  beating rods of iron embedded in charcoal powder
D.  heating steel to bright red and cooling suddenly
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108 .What happens when a drop of glycerol is added to crush KMnO4 sprcad on a paper?
A.  There is a crackling sound
B.  There is no reaction
C.  The paper ignites
D.  There is a violent explosion
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109 .Isobars are lines displaying areas of equal-
A.  Humidity
B.  Temperature
C.  Rainfall
D.  Atmospheri
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110 .Neutron was discovered by
A.  J. J. Thomson
B.  Chadwick
C.  Rutherford
D.  Priestley
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111 .Enzymes-
A.  accelerate bio-chemical reactions
B.  consist of amino acids
C.  have optimum activity at body temperature
D.  have all these properties
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112 .The chemical name of bakin soda is
A.  Sodium carbonate
B.  Sodium bicarbonate
C.  Sodium Chloride
D.  Sodium nitrate
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113 .Sodium metal should be stored in
A.  Alcohol
B.  Kerosene oil
C.  Water
D.  Hydrochloric acid
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114 .Ethanol containing 5% water is known as-
A.  Absolute alcohol
B.  Dilute alcohol
C.  Power alcohol
D.  Rectified spirit
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115 .Gamam rays are-
A.  high energy electrons
B.  low energy electrons
C.  high energy electromagnetic
D.  high energy positions waves
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116 .Plaster of Paris is made from -
A.  Marble
B.  Bauxite
C.  Limestone
D.  Gypsum
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117 .Photographic plates are coated with a film of-
A.  AgCI
B.  AgBr
C.  AgI
D.  AgNO3
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118 .The gas supplied in cylinders for cooking is-
A.  marsh gas
B.  LPG
C.  Mixture of CH4 and C2H6
D.  Mixture of ethane and propane
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119 .The most abundant elements is:
A.  Silicon
B.  Calcium
C.  Nitrogen
D.  Oxygen
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120 .The term 'Carbon foot print' means
A.  A region which is rich in coal mines
B.  The amount of reduction in the emission of CO2 by a country
C.  The use of Carbon in manufacturing industries
D.  The amount of greenhouse gases produced by our day-to-day activities
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