SSC Selection Post 2022 PYQ — Question 66

SSC Selection Post - Higher Secondary Level - 14 March 2022 - Shift 2 • Quantitative Aptitude • Q66

What will be the cost of polishing the curved surface area of a solid cylinder at a rate of ₹28 per sq m, if it has a diameter of 70 cm and a height of 7 m? (Use $\pi ={22 \over 7}$ )

Show answer & explanation

Correct answer: A

Explanation

The correct answer is option 1 i.e. ₹431.20.

Diameter = 70 cm = 0.7 m

Radius = $0.7\over2$ = 0.35 m

Height = 7 m

Curved Surface Area (CSA) = 2 × $22\over7$ × 0.35 × 7 = 2 × 22 × 0.35 = 15.4 m²

Cost = 15.4 × 28 = ₹431.20