Question

In a Survey of India topographic map of scale 1:50,000, the contours are drawn conventionally at intervals of __________ m.

• A. 10 and 20
• B. 20 and 40
• C. 30 and 50
• D. 25 and 50

Hint:

In topographic maps, contour intervals are chosen based on the map scale and terrain steepness. For 1:50,000 SOI maps, the standard intervals are 20 m in plains and 40 m in hilly areas.

Answer 1

The Correct Option is B

Survey of India (SOI) topographic maps at a scale of 1:50{,}000 typically use contour intervals of either 20 m or 40 m, depending on the nature of the terrain. Flatter areas usually use 20 m, while steeper or hilly terrain uses 40 m to prevent clutter and enhance readability.