4. (1) Every application for a certificate of naturalization shall be in writing and shall state, to the best of the knowledge and belief of the applicant,- (a) his age; (b) his place of birth; (c) his place of residence; (d) his profession, trade, or occupation; (e) full particulars regarding his qualifications in respect of the matters referred to in clauses (a) to (f) of sub- section (1) of section 3; (f) whether he has at any time previously applied for the grant of a certificate of naturalization under ¹[***] this Act; (g) whether any such application has been rejected; (h) whether any such certificate has been granted to him; and (i) whether any such certificate granted to him has been revoked or whether he has been deprived of his citizenship under the ²[***] Citizenship Act, 1951. (2) Every such application shall be signed by the applicant and shall be accompanied by an affidavit sworn by him verifying that the statements contained there in are true to the best of his knowledge and beliefe. (3) The Government shall satisfy itself as to the truth of the statements contained in the application, and for this purpose may cause to be made such further inquiry, if any, and may require such further evidence, if any, either by affidavit or otherwise as it thinks necessary.