Question

_____ are darker than the rest of the contour lines with the altitude value is labeled on it.

• A. Contour lines
• B. Index Contour
• C. Contour interval
• D. Contour value

Answer 1

The correct option is B Index Contour

Most toposheets have index contours. These contours are darker than the rest of the contour lines and the altitude value is labeled on these dark lines. This is done for the ease of identification.The contour value represents the altitude of a particular contour line.