Methods of Estimation MCQ with answer and solution

Concept

A cost estimate needs the quantities of materials (concrete, steel, formwork). These come from the tank dimensions, not from the properties of the water stored.

Formula

Volume of concrete = Length × Height × Thickness (for each wall and slab)

Step-by-step solution

1. A cost estimate is made by finding the quantity of each item and multiplying it by its rate. 2. Quantities of concrete, steel, formwork and plaster depend on the tank length, breadth, height and the thickness of slabs and walls. 3. The density of water does not give any quantity of material. 4. So the density of water is not used in the cost estimate. Answer is (A).

Explanation

In estimation we find the volume of concrete, the weight of steel and the area of formwork. All of these depend on the size of the tank and the thickness of its members. The density of water is a design input for loads, not an item in the cost estimate.

Why the other options are wrong

B: Length decides the volume of concrete and the formwork area. C: Height decides the wall quantities. D: Thickness directly decides the volume of concrete.

Shortcut

Estimation is about material quantities. Only dimensions matter, not the stored liquid.

Common mistake

Thinking water density affects cost. It affects structural design (loads), not quantity estimation.