As Deputy Speaker Maheshwar Hazari announced the vote of trust, BJP's former Deputy Chief Minister objected to it, saying that it is not required. Hazari turned down his point and conducted the vote.
He announced his resignation during the special Assembly session called by the ruling party.
Tej Pratap Yadav has been given the charge of Arwal, Mohammad Afaq Alam has been appointed in-charge of Buxar, Ashok Chaudhary for Rohtas and Jamui, while Sharawan Kumar was appointed in-charge for Samastipur district.
Kumar said: "The matter did not come into my cognizance. I was not aware of the warrant issued by the court."
He has given the health ministry to his deputy Tejashwi Prasad Yadav, along with road construction, urban development and housing and rural development.
Kumar has called for the first Cabinet meeting at 4.30 p.m. on Tuesday where the new Ministers will receive their portfolios.
The total ministers in Bihar government reached 33 as Nitish Kumar and Tejashwi Yadav already took the oath of chief minister and deputy chief minister.
After Nitish Kumar parted ways with the BJP-led NDA, speculations are rife about an grand alliance. This is what Nitish Kumar said on being asked about PM candidature.
The leaders of the Mahagathbandhan are tightlipped on the distribution of portfolios but sources have said that Nitish Kumar will keep the Home portfolio with himself, and the post of Assembly Speaker will go to the RJD.
Tejashwi Yadav, who is the Leader of Opposition in the Assembly, is supposed to join the new government in Bihar.
Nitish Kumar then returned to his official residence at 1 Anne Marg along with Tejashwi Yadav, Congress state in-charge Bhakta Charan Das and other leaders of the Mahagathbandhan.
Due to large gatherings, Patna police deployed a large number of police force at those two places to control the situation.
In the political activity in Patna, the Congress and Left parties handed over the lists of their legislators to Rashtriya Janata Dal (RJD) leader Tejashwi Yadav.
BJP sources said they will wait till Nitish Kumar makes the first move.
Kishor had also announced to start 'Jan Suraj' (Good Governance) campaign in Bihar and conduct padyatra of 3000 km to connect with common people of the state.