World population crossed 5 billion on July 11, 1987. When did it cross the 6 billion mark?

A number of political organizations came into existence in India in the latter half of the 19th century. In which year did the Indian National Congress come into being?

There were some territories which were still under colonial rule in India at the time of independence. When did the liberation of all parts of India from colonial rule was finally reach completion?

The greatest revolt which shook the foundation of British rule in India and marked a turning point in the history of India began on:

The year in which the Malayalam Era (Kollam Era) commenced in Kerala?

Raja Rammohan Roy was the central figure in the awakening of modern India. Deeply devoted to the work of religious and social reforms, he founded the Brahma Samaj. Which was the year of establishment of Brahma Samaj?