“96. The rule of natural justice with which we are concerned in these appeals and writ petitions, namely, the audi alteram partem rule, in its fullest amplitude means that a person against whom an order to his prejudice may be passed should be informed of the allegations and charges against him, be given an opportunity of submitting his explanation thereto, have the right to know the evidence, both oral or documentary, by which the matter is proposed to be decided against him, and to inspect the documents which are relied upon for the purpose of being used against him, to have the witnesses who are to give evidence against him examined in his presence and have the right to cross-examine them, and to lead his own evidence, both oral and documentary, in his defence. The process of a fair hearing need not, however, conform to the judicial process in a court of law, because judicial adjudication of causes involves a number of technical rules of procedure and evidence which are unnecessary and not required for the purpose of a fair hearing within the meaning of audi alteram partem rule in a quasi-judicial or administrative inquiry.”