Question

Arrange the following units in decreasing order: nm,km,pm,Dm,mm,m,cm,hm,gm

Answer 1

The units are nm (nano-meter), km (kilo-meter), pm (pico-meter), dm (decimeter), mm (millimeter), m (meter), cm (centimeter), hm (hectometer) and gm (gigameter). Now we can express each of these units in terms of m.

1 nm = $10^{-9}m$, 1 Km = $10^{3}m$ 1 pm = $10^{-12}m$, 1 dm = 0.1 m, 1 mm = 0.001 m, 1 cm = 0.01 m, 1 hm = 100 m, 1 gm = $10^{9} m$. Thus the decreasing unit will be

gm>km>hm>m>dm>cm>mm>nm>pm