If the ratio of the curved surface area and volume of a right circular cylinder is 5 : 7, then its radius is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 2.8 unit
Curved surface area of a right circular cylinder = 2πrh
Volume of a right circular cylinder = πr2h
2πrh/πr2h = 5/7
⇒ 2/r = 5/7
⇒ 2/r = 5/7
⇒ r = 14/5 = 2.8 units