The correct answer is: b) Decennial basis (every 10 years)
The Census of India is a decennial census of India, conducted by the Office of the Registrar General and Census Commissioner, India. The first census was conducted in 1872, and the most recent census was conducted in 2021. The census is used to collect data on the population of India, including age, sex, religion, language, and literacy. The data collected by the census is used to plan for the development of India.
The census is conducted on a decennial basis because it is a large and complex undertaking that requires a significant amount of time and resources. The census is also conducted on a decennial basis because it allows for the comparison of data over time.
The other options are incorrect because:
- Option a) is incorrect because the census is not conducted on an annual basis.
- Option c) is incorrect because the census is not conducted on a five-year basis.
- Option d) is incorrect because the census is not conducted as and when required.