Is it obligatory on the part of the doctors to provide, immediate medical aid?

Yes. In accordance with the Supreme Court directions in Pt. Parmanand Katara's case (AIR 1989 SC 20) it is obligatory for every doctor, be it in Government or private hospital to extend immediate medical aid to the accident victims without insisting on Police Report/Records. Besides, the Court in these series of cases, held the right to health care as a fundamental right of citizens under Article 21 of the Constitution of India.