In quantity surveying for civil engineering works, identify the incorrect rounding convention from the following measurement precisions (dimensions, areas, volumes, and weights).

Introduction / Context:Standard measurement rules in civil engineering (as followed in common Schedules of Rates and methods of measurement) prescribe practical rounding precisions for dimensions, areas, volumes, and weights. Estimators and measurers must adopt consistent rounding so that bills, tenders, and audits reconcile without disputes.

Given Data / Assumptions:

• The conventions refer to on-site or drawing-based take-off for building and infrastructure works.
• Typical precisions: length to centimetres (0.01 m), areas to 0.01 sq.m, volumes usually to 0.01 cu.m, and weights to 0.001 tonne.
• Only one of the listed statements is incorrect.

Concept / Approach:Dimension precision is selected to be fine enough for accuracy yet practical for documentation. Lengths are commonly recorded to 0.01 m. Areas—being products of lengths—are reasonably kept to 0.01 sq.m. Volumes are commonly to 0.01 cu.m for concretes, earthwork, etc., because 0.1 cu.m would be too coarse for many items. Weights (for reinforcement, structural steel, etc.) are frequently recorded to 0.001 tonne (1 kg) for billing accuracy.

Step-by-Step Solution:Evaluate A: 0.01 m for linear dimensions is standard and practical.Evaluate B: 0.01 sq.m is a widely used rounding for area computations.Evaluate C: 0.1 cu.m is overly coarse; standard practice uses 0.01 cu.m to avoid large rounding errors.Evaluate D: 0.001 tonne (1 kg) is an accepted precision for steel and other weights.Therefore, option C is the incorrect statement.

Verification / Alternative check:Check a small slab volume (e.g., 3.5 x 2.4 x 0.1 m = 0.84 cu.m). Rounding to 0.1 cu.m could distort values by more than 5%, which is unacceptable; 0.01 cu.m mitigates this risk.

Why Other Options Are Wrong:

• A, B, and D reflect common, defensible practice and are not incorrect.
• E is false because C is indeed incorrect.

Common Pitfalls:Mixing drawing scale precision with billing precision; over-rounding volumes, which accumulates significant errors across multiple items.

Final Answer:Cubic contents (volumes) are measured to the nearest 0.1 cu.m.