Answer : 1. "1949"
Explanation :

1. After the formation of the United States of Rajasthan, His Excellency the Rajpramukh established the Board of Revenue for Rajasthan by the promulgation of an Ordinance on 7 April 1949.

2. This Ordinance came into force on 1 November 1949 and replaced the revenue divisions of Bikaner, Jaipur, Jodhpur, Matsya and East Rajasthan.

3. These revenue boards were functioning in the princely states under various laws.