Correct metric units in quantity estimation for buildings Select the correct metric unit for the specified quantity when estimating for building works.
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AMetre for length
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BCubic metre for area
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CSquare metres for volume
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DKilogram for weight
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ELitre for capacity
Answer
Correct Answer: Metre for length
Explanation
Introduction / Context:Unit consistency underpins correct quantity takeoff and BOQ preparation. Misstating units causes serious errors in costing, ordering, and measurement. Estimation relies on SI-based metric units for all basic and derived quantities on site.
Given Data / Assumptions:
- Standard SI/metric practice in civil estimation.
- Length, area, volume, mass/weight, and capacity must use correct units.
- One best answer is expected.
Concept / Approach:In SI: length → metre (m); area → square metre (m^2); volume → cubic metre (m^3); capacity (fluids) → litre; mass → kilogram (kg) whereas weight (force) → newton (N). Among the options, only one is unambiguously and universally correct without contextual caveats.
Step-by-Step Solution:
1) Check option (a): length measured in metre → correct.2) Option (b): area is in m^2, not m^3 → incorrect.3) Option (c): volume is in m^3, not m^2 → incorrect.4) Option (d): in engineering, weight is a force; SI unit is newton, not kilogram (kg is mass) → misleading.5) Option (e): litre for capacity is acceptable in practice, but questions of this type typically expect the unequivocal base SI mapping; selecting one, (a) is the safest canonical choice.Verification / Alternative check:Cross-check BOQs: plastering measured in m^2, concrete in m^3, rebar mass in kg (mass) but load in N/kN. Only (a) fits without nuance.
Why Other Options Are Wrong:
- Cubic metre for area: wrong dimension.
- Square metres for volume: wrong dimension.
- Kilogram for weight: weight is force; SI unit is newton.
- Litre for capacity: commonly used, but the question expects the single most canonical mapping; hence (a).
Common Pitfalls:Confusing mass with weight; interchanging area and volume units; ignoring that capacity (litre) is derived and context-dependent.
Final Answer:Metre for length