The correct answer is: b) 10 years.
The Census of India is a decennial census of India. It is conducted by the Office of the Registrar General and Census Commissioner, India, under the Ministry of Home Affairs. The first census was conducted in 1872. 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, literacy, and occupation. The data is used to plan for the development of the country.
The census is a major undertaking, involving the mobilization of a large number of staff and resources. It is also a complex process, as it requires the collection of data from a large and diverse population.
The census is an important tool for understanding the population of India and for planning for its development. It is also a valuable source of information for researchers and academics.
The other options are incorrect because:
- Option a) is incorrect because the census is conducted every 10 years, not every 5 years.
- Option c) is incorrect because the census is conducted every 10 years, not every 15 years.
- Option d) is incorrect because the census is conducted every 10 years, not every 20 years.