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Q. Match the columns I and II
Column I Column II
A Practical unit 1 radian
B Base unit 2 light year
C Derived unit 3 $kg-ms^{-1}$
D Complementary unit 4 second

Physical World, Units and Measurements

Solution:

$(A) \rightarrow (2); (B) \rightarrow (4); C \rightarrow (3); (D) \rightarrow (1)$