Ncert Exercises & Solutions

The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of the box, (b) the difference in the masses of the pieces to correct significant figures?

Here, the mass of the box, m = 2.3 kg
Mass of one gold piece,m₁= 20.15 g = 0.02015 kg
Mass of other gold piece, m₂ = 20.17 g = 0.02017 kg
(a) Total mass = m + m₁ + m₂
= 2.3 + 0.02015 + 0.02017 = 2.34032 kg As the result is correct only upto one place of decimal, therefore, on rounding off total mass = 2.3 kg
(b) Difference in masses = m₂– m₁
= 20.17-20.15 = 0.02 g (correct upto two places of decimal).

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