91. Which of the following substance is highly plastic?
A. Quartz
B. Mica
C. Clay
D. Granite
92. Which one among the following is used as a moderator in nuclear reactors?
A. Ozone
B. Heavy hydrogen
C. Heavy water
D. Hydrogen peroxide
93. Who discovered radioactivity?
A. Marie Curie
B. Roentgen
C. John Dalton
D. Henri Becquerel
94. Charcoal is
A. Amorphous
B. Crystalline
C. Hygroscopic
D. None of these
95. Cooking oil can be converted into vegetable ghee by the process of
A. Oxidation
B. Crystallization
C. Distillation
D. Hydrogenation
96. Another name for mercurous chloride is
A. Amalgam
B. Calomel
C. Blue vitriol
D. Plaster of paris
97. The chief source of aluminium is
A. Bauxite
B. Cargolite
C. Haematite
D. Feldspar
98. The major constituent of air is
A. Hydrogen
B. Carbon dioxide
C. Nitrogen
D. Oxygen
99. The solute in a solution can be separated by
A. decantation
B. evaporation
C. filtration
D. sedimentation
100. The concept of an electrolyte in water was described by
A. Faraday
B. Ohm
C. Debye
D. Arrhenius
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