Question

How Contour diagram help to show the relief features on a map ?
A) Contour is an imaginary line of constant height above the mean sea level.
B) Difference between two successive contours is contour interval
C) Contours are drawn in brown colour on the topo sheet.
D) All of the above

Answer 1

Hint: A relief map shows the height of the ground above the normal sea level on a flat surface. Essential methods for depicting relief features are hachures, contours, shape lines, spot heights, bench marks, trigonometric dots, hill shading, layer-coloring, and so on. Each approach has its own merits and its own merits in portraying land relief.

Complete answer:
Contour is a universal technique for demonstrating relief. In general, the unit of contour measurement is metres above the mean sea level. The benefit of Contour is that it does not mask the other features drawn in brown colour on the toposheet. Contour reading is an ability that enables one to grasp the real landscape. The capacity can be gained by recognising the prominent features of contours.

They are the following:
The contours are drawn in brown colour at periodic intervals. In 1:50,000 and 100m intervals in 1:250,000 toposheets, 20m intervals are typically followed.
Every fifth outline is a dark line to improve the reading of the map.

Lets see each options for clarification :
A) Contour is an imaginary line of constant height above the mean sea level : A contour is an imaginary line above the mean sea level, of constant height thus this is right option
B) Difference between two successive contours is contour interval : The difference between the values of any two contours is known as the contour interval or the vertical interval (V.I.) thus this is also the right option.
C) Contours are drawn in brown colour on the topo sheet : The contours are indeed drawn in a brown colour on the topo sheet making this also the right option.
D) All of the above : as all of the previous options are correct thus this option is the answer.

Hence the correct answer is option ‘D’.

Note: Contours never cut or cross each other in general. In the case of falling water and cliffs, almost the same point or line is highlighted. The contours cut each other into the hanging cliff.

Contour lines never intersect or cross each other. This is because it is difficult to have a position on the surface of the earth which can simultaneously have two or more distinct elevations above sea level. The only exception to this, however, is 'overhanging cliffs' where several contour lines converge to create a continuous line of contours.