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For locating contours by indirect method, two guide points A (Elevation = 600 m) and B (Elevation = 610 m) are established. The horizontal distance between the two points on the plan is 1 cm. Find the distance of the contour of 605 m from point A (on the plan).
  • a)
    0.5 cm
  • b)
    0.5 m
  • c)
    1 cm
  • d)
    1 m
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
For locating contours by indirect method, two guide points A (Elevatio...
**Given Information:**
- Two guide points A and B are established.
- Elevation of point A = 600 m
- Elevation of point B = 610 m
- Horizontal distance between A and B on the plan = 1 cm

**Objective:**
To find the distance of the contour of 605 m from point A on the plan.

**Explanation:**
1. Contour lines are imaginary lines drawn on a map or plan to represent points of equal elevation.
2. The indirect method is used to locate contour lines when the elevations of specific points are known.
3. In this method, guide points with known elevations are established, and the contour lines are drawn by interpolation.
4. In this case, point A has an elevation of 600 m and point B has an elevation of 610 m.
5. The horizontal distance between A and B on the plan is given as 1 cm.
6. To find the distance of the contour of 605 m from point A, we need to interpolate the position of the contour line between A and B.
7. The difference in elevation between A and the contour line is 605 m - 600 m = 5 m.
8. The difference in elevation between A and B is 610 m - 600 m = 10 m.
9. The horizontal distance between A and the contour line can be calculated using the proportion:

(Horizontal distance between A and the contour line) / (Horizontal distance between A and B) = (Difference in elevation between A and the contour line) / (Difference in elevation between A and B)

Let the horizontal distance between A and the contour line be x cm.
Therefore, x cm / 1 cm = 5 m / 10 m
x = 0.5 cm

**Conclusion:**
The distance of the contour of 605 m from point A on the plan is 0.5 cm. Therefore, the correct answer is option 'A' (0.5 cm).
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Community Answer
For locating contours by indirect method, two guide points A (Elevatio...
Given data:
Elevation of point A (Elev.A) = 600 m
Elevation of point B (Elev.B) = 610 m
The horizontal distance between point A and point B on the plan = 1 cm
Distance of the contour of 605 m from point A on the plan =?
The vertical distance (interval) between point A and point B
= Elevation of point B - Elevation of point A 

The vertical distance (interval) between point A and point B = 610 - 600 = 10 m
10 m vertical distance is equal to 1 cm horizontal distance on the plan.
1 m vertical distance = 0.1 cm (horizontal distance on plan)
The vertical distance (interval) between point A and the contour of 605 m = 605 - 600 = 5 m
5 m vertical distance = 5 × 0.1 = 0.5 cm (horizontal distance on plan)
The horizontal distance of the contour of 605 m from point A on the plan is 0.5 cm.
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For locating contours by indirect method, two guide points A (Elevation = 600 m) and B (Elevation = 610 m) are established. The horizontal distance between the two points on the plan is 1 cm. Find the distance of the contour of 605 m from point A (on the plan).a)0.5 cmb)0.5 mc)1 cmd)1 mCorrect answer is option 'A'. Can you explain this answer?
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