Multiple choice general knowledge Who served for shortest duration as prime minister including his/her all terms? Morarji Desai Gulzarilal Nanda Atal Bihari Vajpayee Charan Singh Reveal answer Fill a bubble to check yourself B Correct answer Explanation Gulzarilal Nanda served as Acting Prime Minister twice, for very brief periods totaling only about 26 days (13 days in 1964 after Nehru's death, and 13 days in 1966 after Shastri's death). This is the shortest cumulative tenure.