ABC26GN4892 · Volume and Surface Area

Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: 2007 · Marks: · Difficulty:

A well has to be dug out that is to be 22.5 m deep and of diameter 7m. Find the cost of plastering the inner curved surface at ₹ 3 per sq. meter.

(a)₹ 1465

(b)₹ 1475

(c)₹ 1485

(d)₹ 1495

Answer

Answer (as printed): C

Explanation

Curved surface area $=2 \pi r h=\left(2 \times \frac{22}{7} \times \frac{7}{2} \times 22.5\right) \mathrm{m}^{2}$ $$=495 \mathrm{m}^{2} .$$ ∴ Cost of plastering $=₹(495 \times 3)=₹ 1485$.

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