The provisional President of the Constituent Assembly was – (1) Dr. Sachchidananda Sinha (2) Dr. Rajendra Prasad (3) Dr. B.R. Ambedkar (4) Pt. Jawaharlal Nehru
– (1) Dr. Sachchidananda Sinha Explanation:Dr. Sachidanand Sinha was the first president of the Constituent Assembly. Later, Dr. Rajendra Prasad was elected president of the Constituent Assembly while B.R. Ambedkar was appointed the Chairman of the Drafting Committee.