UPSC Prelims PYQ | Unit and Dimension
Q1. Unit of distance used in navigation is (a) Nautical mile (b) Kilometre (c) Light year (d) Yard (UPSC Prelims 1980) Answer: (a) Nautical mile Explanation: A nautical mile is the standard unit in marine and air navigation, equivalent to 1.852 kilometers, based on the Earth’s circumference. Q2. Distance of stars is measured in(a) Light …