Citizenship Act, 1955
9. Termination of citizenship
(1) Any citizen of India who by naturalization, registration or
otherwise voluntarily acquires, or has at any time between the 26th January,
1950 and the commencement of this Act voluntarily acquired, the citizenship of
another country shall, upon such acquisition or, as the case may be, such
commencement, cease to be a citizen of India:
PROVIDED that nothing in this sub-section shall apply
to a citizen of India who, during any war in which India may be engaged,
voluntarily acquires the citizenship of another country, until the Central
Government otherwise directs.
(2) If any question arises as to whether, when or how any person
has acquired the citizenship of another country, it shall be determined by such
authority, in such manner, and having regard to such rules of evidence, as may
be prescribed in this behalf.