other govt exam CSIR Junior Secretariat Assistant (JSA) 2025 Mock Test Quantitative Aptitude Mensuration Solid Figures
The radius of the base of a solid cone is 9 cm and its height is 21 cm. It cut into 3 parts by two cuts, which are parallel to its base. The cuts are at height of 7 cm and 14 cm from the base respectively. What is the ratio of curved surface areas of top, middle and bottom parts respectively?
1
1 ∶ 4 ∶ 8
2
1 ∶ 3 ∶ 5
3
1 ∶ 3 ∶ 9
4
1 ∶ 6 ∶ 12