152. Temporary appointment of Chief Justice- If the office of Chief Justice of Pakistan becomes vacant, or if the Chief Justice is, by reason of absence or otherwise, unable to perform the duties of his office, those duties shall, until some person permanently appointed to the vacant office has entered on the duties thereof, or until the Chief Justice has resumed his duties, as the case may be, be performed by such one of the other Judges of the Supreme Court as the President may appoint as Acting Chief Justice.
153. Temporary appointment of acting puisne judges- When any Judge of the Supreme Court is appointed to act temporarily as Chief Justice of Pakistan, or when any such Judge is unable to perform his duties on account of absence through grant of leave or for any other reason, the President may appoint a Judge of a High Court, who is qualified for appointment as a Judge of the Supreme Court, to act temporarily as a Judge of that court, and the person so appointed shall be deemed to be a Judge of the Supreme Court until the President revokes the appointment.
154. Appointment of adhoc Judges- If at any time for want of a quorum of the Judges of the Supreme Court it is not possible to hold or continue any sittings of the Court, the Chief Justice of Pakistan may, in writing, require a Judge of a High Court qualified for appointment as a Judge of the Supreme Court to attend the sittings of the Court as an adhoc Judge for such period as may be necessary; and while so sitting such as hoc Judge shall have the same power and jurisdiction as a Judge of the Supreme Court;
Provided that no Judge shall be so nominated by the Chief Justice of Pakistan without previous consultation with the Chief Justice of the High Court concerned.
155. Seat of the Supreme Court.- The Supreme Court shall sit in Karachi and at such other places as the Chief Justice of Pakistan may, with the approval of the President, from time to time appoint:
Provided that the Court shall sit in Dacca at least twice in every year, for such period as the Chief Justice of Pakistan may deem necessary.
156. Original jurisdiction of the Supreme Court.- (1) Subject to the provisions of the constitution, the Supreme Court shall, to the exclusion of any other Court, have original jurisdiction in any dispute between-
(a) the Federal Government and the Government of one or both Provinces; or
(b)the Federal Government and the Government of a Province on the one side, and the Government of the other Province on the other; or
(c) the Governments of the Provinces, if and is so far as the dispute involves
(i) any question whether of law or of fact, on which the, existence or extent of a legal right depends; or
(ii) any question as to the interpretation of the Constitution.
