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, 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, literacy, and occupation. The data is used to plan for the development of the country and to ensure that all citizens have access to essential services.
The census is also used to determine the number of seats that each state has in the Lok Sabha, the lower house of the Indian Parliament.
The census is a major undertaking, and it requires the cooperation of millions of people. The data collected by the census is essential for planning and development, and it is used to ensure that all citizens have access to essential services.
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.