Iron pipes, from which water is supplied, are coated with zinc (Zn) to prevent rusting. This layering process is called?

How many bones are present in human ears?

Polythene is industrially produced by polymerisation of

What is Marble?

Malnutrition leads to lack of which?

By which instrument the purity of milk is measured?

Which of the following is not an area of coral reef?

By which device is the purity of milk measured?