in MVC case to prove the fraud

In response to your query,

Section 154 of the Evidence Act allows a party who calls a witness to ask any question to their own witness like they are cross-examining him. 

Sometimes a witness can turn hostile and it is necessary for the party that called a witness to cross-examine him if such a situation occurs. 

In the case of Sat Paul v. Delhi Administration, the Supreme Court has interpreted this section and defined a hostile witness as one who is not willing, to tell the truth when a party calls him.

Regards,

Aryan Raj