Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
The length of the ideal scale should be ____
10 cm to 20 cm
15 cm to 25 cm
20 cm to 35 cm
10 cm to 25 cm
15 cm to 25 cm
In surveying, an ideal scale refers to the length of the graphical representation used on maps or plans. A length of 15 cm to 25 cm is considered standard for an ideal scale because it provides sufficient readability for precision measurements without making the instrument bulky or difficult to handle in the field.
In surveying, an ideal scale refers to the length of the graphical representation used on maps or plans. A length of 15 cm to 25 cm is considered standard for an ideal scale because it provides sufficient readability for precision measurements without making the instrument bulky or difficult to handle in the field.
RF=Ground┬аDistanceMap┬аDistanceтАЛ тАФ Representative Fraction, which dictates the scale length calculation.
The efficiency of a scale is determined by the trade-off between readability and portability. A scale shorter than 15 cm lacks sufficient divisions for high-precision plotting, while a scale longer than 25 cm becomes unwieldy to carry and prone to mechanical damage or warping, which introduces errors in distance measurement.
An ideal scale balances convenience and accuracy.
Scales are typically constructed of ivory, celluloid, or high-quality seasoned wood.
The range of 15-25 cm ensures the instrument fits comfortably in standard field kits.
Excessive length leads to thermal expansion errors in metal or hygroscopic expansion in wood.
Easy to manipulate on a drawing board.
Provides optimal division spacing for human eye resolution.
Reduces errors due to physical handling.
Fixed scales have limited flexibility for different map ratios.
Manual scaling is susceptible to human observational error.
Topographic map preparation.
Engineering drawing and site planning.
Geodetic and cadastral surveying.
Scales below 15 cm are often used as pocket scales, but they are generally discouraged for professional surveying as they compromise precision.
Any scale exceeding 30 cm is usually classified as a long rule or straight edge, not a portable surveying scale.
B is correct тАФ An ideal scale length of 15 cm to 25 cm is globally standardized to ensure the right balance between ease of handling, portability, and measurement precision.
Always remember that in surveying, the scale is the ratio of map distance to ground distance; choosing the right scale length is crucial for minimizing rounding errors during large-scale site mapping.