Cross-examination

When a witness is cross-examined, he may, in addition to the questions referred to in section 66, be asked any questions which tendCross- examination. (a) to test his accuracy, veracity, impartiality or credibility; or (b) to shake his credit, by injuring his character, but the judge has the right to exercise a discretion in those cases, and to refuse to compel the witness to answer any of those questions when the truth of the matter suggested would not in his opinion affect the accuracy, veracity, impartiality, credibility or credit of the witness in respect of the matter as to which he is required to testify.