Q. When did the new province Bihar came into force during British rule ?

Correct Answer: a) April 1912

Explanation:

The province of Bihar was carved out from the Bengal Presidency during British rule. This reorganization came into effect on 1st April 1912. Prior to this, Bihar was part of the Bengal Presidency, which was a large administrative unit under British India. The separation was done to improve administrative efficiency and governance. Along with Bihar, Orissa (now Odisha) was also separated, leading to the creation of the Bihar and Orissa Province.

Thus, the correct answer is April 1912.