Answer: D. 50m Detailed Explanation: To determine the approximate height of the rest house located north-east of Jeta, we need to consider several geographical and topographical factors that can influence elevation readings. Here’s a step-by-step breakdown of how we arrive at the answer:

1. Understanding Topographic Maps:
2. Topographic maps use contour lines to represent elevation. Each contour line connects points of equal elevation. The spacing between these lines indicates the steepness of the terrain; closely spaced lines suggest steep slopes, while widely spaced lines indicate gentle slopes.
3. Identifying Key Features:
4. In the context of the question, we would typically look at a topographic map or a geographical survey of the area surrounding Jeta. The rest house's location (north-east of Jeta) suggests that we need to analyze the elevation changes in that specific direction.
5. Analyzing Elevation Data:
6. If we have access to a topographic map, we would look for the contour lines in the area north-east of Jeta. For example, if the contour lines indicate that the elevation increases as we move north-east, we would note the specific elevation at the contour line closest to the rest house.
7. Estimating Height:
8. If the contour lines indicate that the area north-east of Jeta has a contour line marked at 50m, and the surrounding lines are at 40m and 45m, we can conclude that the rest house is likely at an elevation of approximately 50m.
9. Cross-Referencing with Other Data:
10. If available, we could also cross-reference this information with other geographical data, such as satellite imagery or elevation profiles, to confirm that the height of 50m is consistent with the surrounding terrain.

Why Other Options Are Incorrect:

• Option A: 30m:
• This option is likely too low based on the elevation data from the area. If the surrounding elevations are higher, then 30m would not be a plausible height for the rest house.
• Option B: 40m:
• While this option is closer to the lower end of the elevation range, it does not account for the higher elevations indicated by the contour lines. If the area is known to have elevations around 50m, then 40m would be an underestimation.
• Option C: 45m:
• Similar to option B, 45m is still below the highest contour line observed. If the contour lines indicate a peak or a higher elevation in the vicinity, then 45m would not accurately reflect the height of the rest house.

Common Pitfalls:

• Misreading Contour Lines: Students often misinterpret the spacing and labeling of contour lines, leading to incorrect height estimations.
• Ignoring Surrounding Elevations: Failing to consider the overall topography can result in underestimating or overestimating the height.
• Assuming Flat Terrain: Some may assume that the area is flat without checking the contour lines, which can lead to significant errors in height estimation.

Revision Summary:

• Topographic maps are essential for understanding elevation and terrain.
• Analyze contour lines carefully to determine the height of specific locations.
• Always cross-reference elevation data with surrounding geographical features.
• Be cautious of common pitfalls in interpreting topographic information.

By following these steps and understanding the reasoning behind the correct answer, students can improve their geographical analysis skills and prepare effectively for their exams.