Does your house have a concrete roof or a thatched one?
What is your main cereal? Do you have internet access - or just a basic mobile phone? And how many married couples live under your roof?
These are among the 33 questions that more than a billion Indians will be asked as the country launches the world's largest census on Wednesday, marking the first population count in more than 15 years.
The two-phase exercise, billed as the world's most ambitious of its kind, will see more than three million officials spend a year counting every person in India.
India's 16th census - the eighth since independence in 1947 - will also include caste data and is seen as crucial for policy, welfare delivery and political representation in the world's most populous country.
