Section 154 of Evidence Act "Question by party to his own witness"
The Court may, in its discretion, permit the person who calls a witness to put any questions to him which might be put in cross examination by the adverse party.
Section 155 of Evidence Act "Impeaching credit of witness"
The credit of a witness may be impeached in the following
ways by the adverse party, or, with the consent of the
Court, by the party who calls him:-
(1) by the evidence of persons who testify that they, from
their knowledge of the witness believe him to be unworthy of
credit;
(2) by proof that the witness has been bribed, or has
90[accepted] the offer of a bride, or has received any other
corrupt inducement to give his evidence;
(3) by proof of former statements inconsistent with any part
of his evidence which is liable to be contradicted;
(4) When a man is prosecuted for rape or an attempt to
ravish, it may be shown that the prosecutrix was of
generally immoral character.
Explanation - A witness declaring another witness to be
unworthy of credit may not, upon his examination-in-chief,
give reasons for his belief, but he may be asked his reasons
in cross-examination, and the answers which he gives cannot
be contradicted, though, if they are false, he may
afterwards be charged with giving false evidence.
Illustrations
(a) A sues B for the price of goods sold and delivered to B.
C says that he delivered the goods to B.
Evidence is offered to show that, on a previous occasion, he
said that he had delivered goods to B.
The evidence is admissible.
(b) A is indicated for the murder of B.
C says that B, when dying, declared that A had given B the
wound of which he died.
Evidence is offered to show that, on a previous occasion, C
said that the wound was not given by A or in his presence.
The evidence admissible.
Section 156 of Evidence Act "Questions tending to corroborate evidence of relevant fact, admissible"
When a witness whom it is intended to corroborate gives
evidence of any relevant fact, he may be questioned as to
any other circumstances which he observed at or near to the
time or place at which such relevant fact occurred, if the
Court is of opinion that such circumstances, if proved,
would corroborate the testimony of the witness as to the
relevant fact which he testifies.
Illustration
A, an accomplice, gives an account of a robbery in which he
took part. He describes various incidents unconnected with
the robbery which occurred on his way to and from the place
where it was committed.
Independent evidence of these facts may be given in order to
corroborate his evidence as to the robbery itself.