Correct Answer - Option 2 : Square metre
Explanation:
The principle of units of measurements normally consists of the following:
(i) Single units work like doors, windows, trusses, etc., are expressed in numbers.
(ii) Works consists of linear measurements involve length like cornice, fencing, handrail, bands of specified width, etc., are expressed in running meters (m).
(iii) Works consist of areal surface measurements involve area like plastering, whitewashing, partitions of specified thickness, Formworks, Concrete Jeffries, Damp proof course, etc. are expressed in square meters (m2)
(iv) Works consist of cubical contents which involve volume like earthwork, cement concrete work e.g. R.C. Chhajja, Masonry, etc. are expressed in Cubic meters (m
3).