SSC JE Civil Engineering 30-Oct-2020 Shift 1 Paper

Question : 113 of 200

Marks: +1, -0

For a scale of 1 cm = 2.5 km, the representative fraction is:

1 ∶ 250000
1 ∶ 2500000
1 ∶ 25000
1 ∶ 2500

Solution:

Representative Fraction (R.F.): It is a ratio or fraction, that expresses the mathematical relationship between map and land. It is the ratio of the distance between any two fixed points on map to the original distance on the land.
R. F.

={\text " Distance on Map " }/{\text " Actual corresponding distance on ground"}

Scale (S): It is a fixed ratio that every distance on the plan bears with corresponding distance on the ground.
∴ R. F

={1 {\cm}}/{2.5 {\km}}

={1 {\cm}}/{250000 {\cm}}

={1}/{250000}

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