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Volumes Practice Test 4
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© examsnet.com
Question : 3
Total: 16
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.
© examsnet.com
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