Can I use MOSFETS instead of transistor in the given circuit
That is some kind of oscillating circuit, presumably to generate a higher frequency input to a smaller transformer than you could use at line frequency.
From the values given, I expect it makes use of the properties of the specified transistors to function properly.
I don't think you could replace them with just any other NPN transistor and expect it to work.
MOSFETs are right out.