Units of Measurement MCQ with answer and solution

Concept

Painting is a surface finish, so it is measured by area in square metre (m²).

Step-by-step solution

1. Painting covers only the surface of walls, doors and windows. 2. A surface quantity is measured as area. 3. The unit of area in the SI system is square metre (m²). 4. So painting is measured in square metre.

Explanation

Painting is a thin coat on a surface, so its thickness is not counted. Only the area painted is measured. Hence the unit is square metre.

Why the other options are wrong

B: Cubic metre is for volume items like concrete, brickwork and earthwork. C: Gram is a unit of mass, used for small material quantities, not work done. D: Pound is an old FPS unit of weight, not used for painting work.

Shortcut

Surface finishes (plastering, painting, whitewashing, flooring) are measured in m².

Common mistake

Confusing the unit for painting work (m²) with the unit for buying paint (litre or kg).