Multiple choice general knowledge The Bank of Calcutta, Bank of Bombay and Bank of Madras were merged in 1921 to form Reserve Bank of India Imperial Bank of India Bank of India Union Bank of India Reveal answer Fill a bubble to check yourself B Correct answer Explanation In 1921, the three presidency banks - Bank of Calcutta, Bank of Bombay, and Bank of Madras - merged to form the Imperial Bank of India, which later became the State Bank of India in 1955.