Which of the following is/are correct?
i.1 km=103 m
ii.1 km=105 cm
iii.1 km=107 mm
i and ii
Kilometre is a unit of measuring distance. The word ‘kilo’ means thousand. So, one kilometre = 1000 metres.
∴1 km=1000 m=103 m
We know that, 1 m=100 cm
∴1 km=1000×100 cm=100000 cm=105 cm
Also, 1 cm=10 mm
∴1 km=100000×10 mm=1000000 mm=106 mm
Out of the given options, i and ii are correct.