child may, within one year after attaining full age, make a declaration in the prescribed form and manner that he wishes to resume Indian citizenship and shall thereupon again become a citizen of India. 9. Termination of citizenship.—(1) Any citizen of India who by naturalisation, 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 Civil Appeal No.5932 of 2023, etc. Page 20 of 25commencement, 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 citizen of India has acquired the citizenship of another country, it shall be