Bihar was established as a separate administrative unit in 1911 when it was separated from Bengal Presidency. This administrative reorganization created the province of Bihar and Orissa.

Vallabhbhai Patel led the Bardoli Satyagraha in Gujarat in 1928. Though primarily a Gujarat movement, it inspired similar movements across India including Bihar and strengthened the independence struggle.

Sher Shah Suri was born in Sasaram in Bihar. He was an Afghan ruler who briefly ruled India and is known for his administrative reforms, including the construction of the Grand Trunk Road.

Total production = 60 + 45 = 105 quintals. Total area = 120 + 80 = 200 acres. Average productivity = 105 ÷ 200 = 0.525 ≈ 0.52 quintals per acre.

Kautilya's Arthashastra mentions Pataliputra as the capital of the Mauryan Empire. The text describes the city's administrative organization, fortifications, and importance as a center of power.

Koderma district is famous for its rich deposits of mica, coal, and other minerals. It is one of the most mineral-rich districts in Bihar and is an important center for mining and mineral extraction.

Patna Sahib Gurudwara is the birthplace of Guru Govind Singh, the tenth Guru of Sikhism. It is one of the five most sacred Gurudwaras in Sikhism and is located in Patna city.

The Kosi River, originating in Nepal and flowing through Bihar, is known as the 'Sorrow of Bengal' due to its devastating floods that affect Bihar and Bengal. It is one of the most unpredictable rivers in India.

Mahavira spent his final years in Pawapuri (also spelled Pava) in Bihar, where he attained Nirvana. Pawapuri is an important pilgrimage site for Jains and contains the Samosaran temple marking the spot of his enlightenment.

Nalanda University was destroyed by Bakhtiyar Khilji (also spelled Bakhtiar Khilji) in the late 12th century. This marked the end of one of the world's oldest residential universities.