On a topographical map, where is the sheet number typically found?

Introduction / Context:
This question focuses on basic map handling and referencing skills. Every topographic sheet or map sheet is assigned a sheet number so that it can be identified and indexed among many other sheets. Knowing where to find this number on a map is important for referencing locations, ordering maps, and using atlases or survey maps correctly.

Given Data / Assumptions:

• The question refers to topographical map sheets used for detailed mapping.
• It asks for the typical position of the sheet number on such a map.
• The options include positions inside the map area and in the margins.
• We assume standard survey map layout where margins contain important information.

Concept / Approach:
Topographic maps usually have a neat line that frames the map area, and there is a margin around this neat line. Information such as the sheet number, map title, scale, legend, and other notes are placed in the margins rather than across the main map image. The sheet number is typically printed near a corner, for example, at the top right or bottom right corner, outside the map frame but within the margin so that it is visible when maps are filed or stacked.

Step-by-Step Solution:
Step 1: Recall that the main map area is kept as clear as possible for geographic information like contours, roads, and settlements. Step 2: Understand that supporting information such as title, scale, legend, and sheet number is printed in the margins around the map. Step 3: Note that the sheet number is typically found at a corner, often the top right or bottom right, where it can be quickly read when maps are stacked. Step 4: Evaluate the options. The only one that matches this standard practice is the margin at one of the corners. Step 5: Select option C as the correct answer.

Verification / Alternative check:
To verify, recall any school exercise where you used a Survey of India sheet or a similar topographic map. When you picked up the sheet and looked at its edges, the sheet number was seen near a corner in the margin, not across the main map or floating near a city. This design makes it easy to identify the sheet when it is folded or placed in a pile, since the corners remain visible.

Why Other Options Are Wrong:
Option A is incorrect because the legend or key box is usually located in one part of the margin and may or may not include the sheet number, but the sheet number is specifically printed as a separate label in the corner. Option B is wrong because it would be confusing and untidy to place such references inside the map near a city. Option D is incorrect because printing the sheet number diagonally across the map would obscure geographic details and is not a standard practice in cartography.

Common Pitfalls:
Some students may not pay attention to margins when using maps and therefore guess based on intuition. Others may confuse the map title and the sheet number. To avoid mistakes, always make a habit of reading all information in the margins of a map, including the sheet number, scale, legend, and publication details. This not only helps in answering exam questions but also in real world use of maps.

Final Answer:
On a topographical map, the sheet number is typically found in the margin at one of the corners, usually outside the map frame.