The correct Index No. of the following one-inch or quarter degree topographical sheet is: [cite: 64]

Question

Accepted Answer

The correct Index No. of the following one-inch or quarter degree topographical sheet is: 53 P/2

Here's why Option 3 (53 P/2) is the correct answer and why the other options are incorrect, based on the standard topographical sheet numbering system:

*   **Option 3: 53 P/2 (Correct)** This represents a one-inch or quarter-degree topographical sheet. The system works as follows:

*   **53:** This is the primary index number, representing a larger area.
    *   **P:** This letter further divides the area represented by '53' into smaller sections. The letters A through P are typically used to divide the area.
    *   **/2:** This number further subdivides the area represented by '53 P' into even smaller quarter-degree sheets. The numbers 1 through 16 are typically used for this level of division. Therefore, '53 P/2' represents a specific quarter-degree sheet within the larger area defined by '53' and 'P'.

*   **Option 1: 53 (Incorrect)** This only represents the primary index number, indicating a much larger area. It doesn't specify a one-inch or quarter-degree sheet. A one-inch sheet requires further subdivision using a letter and a number.

*   **Option 2: 53 P (Incorrect)** This represents an intermediate level of division. While it's more specific than '53', it still doesn't pinpoint a specific one-inch or quarter-degree sheet. It needs the final numerical division (e.g., /2, /3, etc.) to identify the correct sheet.

*   **Option 4: 53 P/2/4 (Incorrect)** This represents a level of detail beyond the standard one-inch or quarter-degree sheet numbering system. The standard system uses a primary number, a letter, and a single number after the slash to define a quarter-degree sheet. Adding another number after a second slash implies a further subdivision that is not part of the standard one-inch sheet indexing.