11. Which type of fire extinguisher is used for petroleum fire ?
12. Man dies in the atmosphere of CO, because it
13. 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
14. Which gas is used as fire extinguisher ?
15. The process which does not evolve CO2 in air is
16. The metal used to galvanise iron to protect it from rusting is
17. Iron is prevented from rusting by coating with zinc. This process is called as
18. An electric iron has a heating element made of :
19. The metal chiefly used for galvanising iron is :
20. The anode in a dry cell consists of
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