The governor and lieutenant governor shall each qualify within ten days after the result of the election shall be declared by the general assembly, by taking an oath in its presence, in joint convention assembled, administered by a judge of the supreme court, to the effect that each will support the Constitution of the United States and the Constitution of the State of Iowa, and will faithfully and impartially, and to the best of the officer’s knowledge and ability, discharge the duties incumbent upon the officer as governor, or lieutenant governor, of this state.