Solution:382 persons per sq km• The population density of India went up to 382 persons per square kilometre in 2011 from 325 persons per square kilometre in 2001.
• Bihar is the most thickly populated state (1106 persons/sq km.) followed by West Bengal 1028 and Kerala 860.
• Population density increased at the rate of 17.54 from 2001 to 2011.