The Foreigners Act, 1946
8. Determination of nationality. -
(1) When a foreigner is recognized as a national by the law of more than one foreign country or where for any reason it is uncertain what nationality, if any, is to be ascribed to a foreigner, that foreigner may be treated as the national of the country with which he appears to the prescribed authority to be most closely connected for the time being in interest or sympathy or if he is of uncertain nationally, of the country with which he was last so connected:
Provided that where a foreigner acquired a nationality by birth, he shall, except where the Central Government so directs either generally or in a particular case, be deemed to retain that nationality unless he proves to the satisfaction of the said authority that he has subsequently acquired by naturalization or otherwise some other nationality and still recognized as entitled to protection by the Government of the country whose nationality he has so acquired.
(2) A decision as to nationality given under sub-section (1) shall be final and shall not be called in question in any Court:
Provided that the Central Government, either of its own motion or on an application by the foreigner concerned, may revise any such decision.
A married woman acquires the domicile of her husband on marriage and capable of acquiring a new domicile by re-marriage after divorce. (State of Bihar v. Amar Singh, AIR 1955 S.C. 282).