Multiple choice

A well, $14m$ deep is $2 m$ is radius. Find the cost of cementing the inner curved surface at the rate of $Rs 2$ per square metre

  1. $Rs 242$
  2. $Rs 352$
  3. $Rs 464$
  4. $Rs 294$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The inner curved surface area of the well is 2pi rh = 2pi x 2 x 14 = 56pi square metres. At Rs 2 per square metre, the cost is 112pi, which is approximately Rs 352 using pi = 22/7.

AI explanation

The inner curved surface area of the well, treated as a cylinder, is calculated using the formula 2*pi*r*h. Substituting the given radius of 2 m and height of 14 m gives an area of 2 * 22/7 * 2 * 14 = 176 square meters. Multiplying this area by the cementing cost of Rs. 2 per square meter gives a total cost of 176 * 2 = Rs. 352.

Keep practicing — related questions