Volumes Practice Test 4

Question : 3 of 16

Marks: +1, -0

Diameter of a roller is 2.4 m and it is 1.68 m long. If it takes 1000 complete revolutions once over to level a field, the area of the field is

12672 sq. m
12671 sq. m
12762 sq. m
11768 sq. m

Validate

Solution:

Surface area of the roller = 2πrh =

2×{22}/7 × 1.2 × 1.68

= 12.672 sq. m
In one complete revolution, the roller covers 12.672 sq. m.
∴ It will cover in 1000 revolutions = 12.672 × 1000 = 12672 sq. m
Hence, area of the field = 12672 sq. m.

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