Science

Q.7 What is electroplating?

Ans: Electroplating : To prevent containers made of iron from corrosion, they are plated by a layer of chromium or nickel to make their surface smooth and shiny. Similarly, silver or other metallic jewelry are plated with a layer of gold to give them golden luster. In the past history of India, people were aware of the process of plating. The process of plating one metal on the other metal by chemical effect of electric current is known as electroplating. It is based on the principle of electrolysis.



Q.8 Write Fleming's left hand rule.

Ans. Fleming's left hand rule- If we stretch out the forefinger, the middle finger and the thumb of the left hand, so that they are mutually perpendicular. Now if the forefinger points the direction of magnetic field, the middle finger points the direction of current then the thumb indicates the direction of force acting on the conductor.