Explanation:

- 1951: The first census of Independent India was conducted in 1951. It was a significant milestone, marking the beginning of modern demographic data collection in the newly independent nation.

- 1956: This year does not align with the decennial schedule followed for the Indian census, which occurs every 10 years.

- 1953: This year is incorrect for a census event as census years are scheduled in line with the decade mark.

- 1948: India was still establishing itself post-independence, and no national census took place during this year.