111. Which type of fire extinguisher is used for petroleum fire ?
112. Man dies in the atmosphere of CO, because it
113. It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
114. Which gas is used as fire extinguisher ?
115. The process which does not evolve CO2 in air is
116. The metal used to galvanise iron to protect it from rusting is
117. Iron is prevented from rusting by coating with zinc. This process is called as
118. An electric iron has a heating element made of :
119. The metal chiefly used for galvanising iron is :
120. The anode in a dry cell consists of
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