In British contemporary history there were only five Emperors of India:

1) Queen-Empress Victoria (1876–1901)

2) King-Emperor Edward VII (1901–1910)

3) King-Emperor George V (1910–1936)

4) King-Emperor Edward VIII (1936)

5) King-Emperor George VI (1936–1947)

George VI was the last Monarch to be Emperor of India. India gained independence in 1947, five years before Elizabeth II became Queen in 1952. Queen-Empress Elizabeth ("The Queen Mum") became the final residing individual who - as consort - used the name until India's independence on August 14-15, 1947. George VI remained as King of Pakistan till his death in 1952.

Elizabeth II became titled Queen of Pakistan until Pakistan became a republic on 23 March 1956.

More Info: en.wikipedia.org