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

Here is Why You Need An Adapter

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

Belarus

In Belarus, outlets of type C and F are in use.

Type C

Type F

India

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

Type C

Type D

Type M