6) Which metal is used in electroplating to the metal surface to resist corrosion for long period and to retain high polish?

7) Which metal protects corrosion resistant and does not crack or peel off due to temperature variation on coating?

8) Which corrosion resistant metal is used in chemical plant and food processing?

9) What is the purpose of thrust ball bearing?

10) Which bearing material is used in connecting rod and electrical motors?