Answer :

(i) We know the basic relation that

1km = 1000m


1 m = 1000 mm


Therefore 1 km = 1000×1000


= 106 mm


We also know that


1 m = 1012pm


Therefore 1 km = 1000× 1012 pm


= 1015pm


(ii) We know the basic relation that


1 kg = 1000 g


1 g = 1000 mg


So, 1 mg = 10-3g


Therefore 1 mg = 10-3 × 10-3 kg


= 10-6 kg


1 g = 109ng


1000 mg = 109 ng


1 mg = [109]/103 ng


= 106 ng


(iii) We know the basic relation that


1 L = 1000 ml


1 ml = 10-3 L


1 ml = 10-3 dm3


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