S. 4 : Charge of income-tax-A Government undertaking, nodal agency for propagation of non-conventional energy sources-Grants-in-aid from Government-Unutilised grants-in-aid placed in fixed deposit with banks-Interest earned is not income as unutilised grant-in-aid was also a part of grant-in-aid-Precedent-High Court-Fact that judgment of High Court is under challenge before Supreme Court is cannot be a ground for Tribunal not to follow it. [S. 260A Art. 136]