Islamabad - Mulk also served as the interim chief of the Election Commission of Pakistan.
The interim administration does not usually make any major decisions until the new government is elected, though it may be forced to act to shore up the economy amid a worsening macro-economic outlook.
Monday's appointment, announced by premier Shahid Khaqan Abbasi, comes amid growing political and economic instability, and ends weeks of wrangling between Abbasi's ruling Pakistan Muslim League-Nawaz (PML-N) party and the opposition.
"No Pakistani can lift a finger (against) such a name," Abbasi told reporters, seated next to Syed Khurshid Ahmed Shah, who led talks for the opposition Pakistan People's Party (PPP).
Unlike the run-ups to the previous two elections, which were marred by frequent attacks by militants, Pakistan has seen a sharp decline in militancy over the past few years.
But allegations of interference by the powerful, coup-prone military are rife ahead of the election, with the PML-N accusing the military of trying to weaken it.
The military, which has ruled Pakistan for about half its history since independence in 1947, denies meddling in politics.
Mulk, who also served as the interim chief of the Election Commission of Pakistan, will head a technocratic government after the current government and parliament are dissolved on Thursday.
Issues Mulk and his team will have to contend with, though briefly, range from international isolation and strained ties with the United States to nursing the economy which is increasingly relying on Chinese loans to stay afloat. - Reuters