81. The substance which does not expand on going from liquid state to solid state is
82. Glycol is added to aviation gasoline because it
83. Which is the heaviest metal among the following?
84. The wire of flash bulbs is made up of
85. Which among the following is found in chlorophyll ?
86. Among the following the hardest metal is
87. What material is used to make electric heater coil ?
88. Among the following, which is always found in free-state in nature?
89. Philosopher’s Wool is
90. Which of the following metals has least melting point ?
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