Bihar was separated from Bengal –

in 1910
in 1912
in 1921
in 1947

The correct answer is: B. in 1912

Bihar was separated from Bengal in 1912. The province of Bihar and Orissa was created on 1 April 1912, when the Bengal Presidency was divided into two provinces, Bihar and Orissa and Bengal. The new province of Bihar and Orissa comprised the following districts:

  • Bhagalpur
  • Champaran
  • Darbhanga
  • Gaya
  • Monghyr
  • Muzaffarpur
  • Patna
  • Saran
  • Shahabad
  • Singhbhum
  • Sundarbans
  • Orissa

The province of Bihar and Orissa was renamed Bihar in 1936, when Orissa was separated to form a separate province.

Option A is incorrect because Bihar was not separated from Bengal in 1910.

Option C is incorrect because Bihar was not separated from Bengal in 1921.

Option D is incorrect because Bihar was not separated from Bengal in 1947.