21. When a spoon is to be electroplated with nickel the spoon is
22. Conversion of chemical energy into electrical energy occurs in
23. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
24. Galvanization of iron is carried out using
25. The working of a dry cell is based on
26. Galvanization is the :
27. Which one of the following metals is used to galvanise iron ?
28. A non-electronic conductor is
29. The anode of a dry cell is made up of
30. The coating of a thin layer of zinc on steel or iron objects is known as
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