Question 14
Mensuration of SolidsA cylindrical metallic barrel of height 2.5 m and radius 0.245 m is closed at one end. Find, correct to one decimal place, the total surface area of the barrel. [Take π = 22/7]
- A.2.1 m2
- B.3.5 m2
- C.4.0 m2
- D.5.1 m2
Show the answer and explanation
Answer: C (4.0 m2)
Explanation
Curved surface + one end = 2πrh + πr² = 22/7 × 0.245 × (5 + 0.245) ≈ 4.04, so 4.0 m².