Consider the following statements with respect to cubical content method. I. This is a preliminary estimate. II. This is an approximate estimate. Which of the following options is true?
- ABoth statements I and II are trueCorrect
- BOnly statement I is true
- CBoth statements I and II are false
- DOnly statement II is true
Solution
Concept
The cubical content method is a quick preliminary (approximate) estimate based on building volume.
Formula
Approximate cost = Plinth area × Height × Rate per m³
Step-by-step solution
1. Cubical content method: cost = total volume of building × cube rate. 2. Volume = plinth area × height (usually floor level to top of roof). 3. It is done at an early stage, before detailed drawings, so it is a preliminary estimate. Statement I is true. 4. It uses an average rate, not detailed quantities, so it is an approximate estimate. Statement II is true. 5. Both statements are true, so the answer is A.
Explanation
The cubical content method multiplies the building volume by a cube rate from similar buildings. It is used at the early planning stage, so it is a preliminary estimate. It is not based on item-wise quantities, so it is also an approximate estimate.
Why the other options are wrong
B: Statement II is also true. C: Both statements are true, not false. D: Statement I is also true.
Shortcut
Plinth area method, cubical content method and unit rate method are all preliminary (approximate) estimates.
Common mistake
Thinking 'preliminary' and 'approximate' are different types. Here both words describe the same rough estimate.
Correct answer: A) Both statements I and II are true