S. 4 : Charge of income-tax-Infrastructure projects-Nodal agency to implement certain schemes of State Government and unspent amount of grant given to assessee for carrying on infrastructure projects remained property of Government and had to be returned to Government as and when demanded-Grant cannot be assessed as income-Interest earned on deposits of surplus Government grants received by assessee to carry on its business activity of development of infrastructure projects was to be treated as part of grants and same could not be treated as income of assessee. [S. 28(i), 145]