Explanation:

The Constituent Assembly met for the first time in New Delhi on 9 December, 1946 in the Constitution Hall which is now known as the Central Hall of Parliament House.The Constituent Assembly took almost three years (two years, eleven months and seventeen days to be precise) to complete its historic task of drafting the Constitution for Independent India. During this period, it held eleven sessions covering a total of 165 days. Of these, 114 days were spent on the consideration of the Draft Constitution. The Constitution of India was adopted on 26 November, 1949 and the hon'ble members appended their signatures to it on 24 January, 1950. In all, 284 members actually signed the Constitution. On that day when the Constitution was being signed, it was drizzling outside and it was interpreted as a sign of a good omen.

The Constitution of India came into force on 2 6 January, 1950. On that day, the Assembly ceased to exist, transforming itself into the Provisional Parliament of India until a new Parliament was constituted in 1952.
Moreover, it is World's lengthiest written constitution had 395 articles in 22 parts and 8 schedules at the time of commencement. Now Constitution of India has 448 articles in 25 parts and 12 schedules. There are 101 amendments have been made in the Indian constitution.