A total of 49 Assembly seats would witness elections in the first phase on October 12.
Last date for filing of nominations for first phase of elections was September 23.
Two nominations were filed on the opening day today.
Assembly elections in Bihar would be fought in five phases between October 12 and November 5 in a high-stakes battle, seen as a major popularity test for the NDA spearheaded by Prime Minister Narendra Modi and incumbent Chief Minister Nitish Kumar, who was in alliance with the RJD and the Congress.
There are over 6.68 crore voters in the state, of whom as many as 2.04 crore voters belong to the age group of 18 to 29 years.