S. 271AAB : Penalty-Search initiated on or after Ist day of July 2012-Surrender of income in the course of search-Failure to disclose in the return-Penalty is justified in respect of difference added as undisclosed income-Limb under which penalty is to be levied spelt out and assessee not offered explanation-Limitation-Tribunal passing order in quantum appeal on 27-9-2019 and penalty order passed on 23-3-2020-Order is within prescribed time-limit-No violation of principle of natural justice. [S.271AAB(1)(c), 274(1), 275(1)]