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Question

Find mass of an iron cube of side 2 cm. (Density of iron is 7.8 gm/cm 3)

This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is

62.4 gm

Topper's Approach:

Mass = 23 × 7.8 = 62.4 gm

Detailed solution:

Side of the iron cube = 2 cm

∴ Volume of the iron cube = 23 = 8 cm3

Density of iron = 7.8 gm/cm3

∴ Mass of the iron cube = 8 × 7.8 = 62.4 gm
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