Polity and Administration of Bihar

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1.
The name of “Bihar” is derived from Vihara. Which of the following is correct meaning of Vihara?
2.
Jharkhand was separated from Bihar by which of the following laws?
3.
Which of the following is the State Flower of Bihar?
4.
Which of the following is the state tree of Bihar?
5.
Which of the following is the state Animal of Bihar?