You Do Need power plug adapter while traveling from Switzerland to India.

Here is Why You Need An Adapter

The outlet and plug type used in India are C, D and M and in Switzerland are C and J. This is how they look like.

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J

India

In India, outlets of type C, D and M are in use.

Type C

Type D

Type M