Q. A solid brass sphere of radius 2.1 dm is converted into a right circular cylindrical rod of length 7cm. The ratio of total surface areas of the rod to the sphere is
A) 1:3
B) 3:1
C) 3:7
D) 7:3
✔ Correct Answer: 7:3
Exam Insight
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A) 1:3
B) 3:1
C) 3:7
D) 7:3
✔ Correct Answer: 7:3
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