You Do Need power plug adapter while traveling from Gaza Strip to Oman.

Here is Why You Need An Adapter

The outlet and plug type used in Oman is G and in Gaza Strip are C and H. This is how they look like.

Gaza Strip

In Gaza Strip, outlets of type C and H are in use.

Type C

Type H

Oman

In Oman, outlets of type G are in use.

Type G