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Which of the following characteristics are not for an ideal scale?
Zero of the scale should be placed anywhere on scale
Scale length should be 15cm to 25cm
R.F. should be clearly written on the scale
None of the above
Zero of the scale should be placed anywhere on scale
An ideal scale in surveying must be precise and standardized. The zero mark must be located at the beginning of the scale (after one primary division subdivided into smaller units) to ensure accurate measurements, making 'Zero placed anywhere' an incorrect practice.
An ideal scale in surveying must be precise and standardized. The zero mark must be located at the beginning of the scale (after one primary division subdivided into smaller units) to ensure accurate measurements, making 'Zero placed anywhere' an incorrect practice.
R.F.=GroundDistanceMapDistance — Representative Fraction definition
In surveying, scales utilize the Representative Fraction (R.F.) to maintain geometric similarity. A scale consists of a 'zero' mark placed at a precise distance from the left edge, where the first division is further subdivided into smaller graduations. Placing the zero arbitrarily would make reading fractional measurements impossible.
The zero mark must be located after one primary division unit on the left side of the scale.
Scale length typically ranges between 15 cm and 30 cm for field convenience.
R.F. must be clearly labeled on every scale to identify the reduction ratio.
The scale should be constructed from stable, non-stretching materials.
Enables accurate scaling of map distances
Provides quick visual verification of survey units
Susceptible to errors if the scale is incorrectly manufactured
Material expansion/contraction can alter accuracy
Preparation of engineering drawings and site maps
Measuring distances directly from topographical sheets
Option A is incorrect because the zero mark has a specific structural requirement to facilitate the measurement of fractional units in surveying.
Option B (15cm to 25cm) is a standard practical recommendation to balance portability and readability.
Option C is a mandatory requirement for engineering drawing compliance.
A is correct — The zero mark must be positioned after the first primary unit to enable reading subdivisions, not placed arbitrarily.
Always remember that in surveying, the '0' mark is the reference point for secondary divisions; misplaced zeros lead to cumulative errors in distance computation.