Nepal runs on 230 V at 50 Hz, with sockets following Types C, D and M. No surprises on voltage: Nepal runs at 230 V, the same range as at home in the UK.
You will find identical sockets in Bhutan. Nearby but different: Oman, Qatar and Bahrain – an adapter for Nepal will not fit there. Across Asia this setup is fairly rare: 2 of 50 countries.
Protective earth
Grounded and ungrounded sockets may occur
Nepal has sockets with a protective earth (Types D and M) and without (Type C). A plug that fits mechanically does not guarantee earthing.