(k)of workers engaged in any work, which is notified by the State Government in the Official Gazette as a work of national importance, from the provisions of section 51, section 52, section 54, section 55 and section 56. (3) Rules made under sub-section (2) providing for any exemption may also provide for any consequential exemption from the provisions of section 61 which the State Government may deem to be expedient, subject to such conditions as it may prescribe.