According to the Census of 2011, which district of Rajasthan had the lowest population density?

The correct answer is C, Jaisalmer. At the Census of 2011 Jaisalmer recorded a density of about 17 persons per square kilometre, the lowest of any district in the state, because it is the largest district by area at 38,401 square kilometres and the thinnest in population at roughly 6.7 lakh. Option A is wrong because Barmer, although also a large desert district, is far more populous and its density is several times that of Jaisalmer. Option B is wrong because Bikaner likewise has a much higher density than Jaisalmer. Option D is wrong because Churu lies in the semi-arid Shekhawati belt and is denser still. The highest density in 2011 was in Jaipur, at 595 persons per square kilometre. The pairing to learn is that Jaisalmer holds the lowest figure for both population and density while Jaipur holds the highest for both, so the two districts between them answer four separate questions.