Question 1

Question 3Ridge and Water Divide

Accepted Answer

RidgeWater DivideIt is a long and narrow highland sloping steeply downwards on its sides.A line which separates two adjacent drainage basins is known as water divide.Contours showing a ridge are elongated and are closely spaced.The side on which the ridge is steeper, the contours are drawn closely together, whereas the side on which the ridge is gentle, the contours are drawn far apart.

Question 2

Question 4Peak and Depression

Accepted Answer

PeakDepressionThe highest point of a mountain is known as a mountain peak.A depression is formed when there is a sudden decrease in height at the top of a conical hill.Contours showing a conical mountain are almost circular with peak of the mountain as their centre. The contours are drawn almost at regular distances, the value of which increases towards the centre, which is the peak and represented with a dot.Contours showing a depression are almost circular like a conical hill with a depression as their centre. The contour lines are drawn at regular distances, and their value keeps on increasing towards the centre, where the lines suddenly show decrease in height at the centre, which is the depression.

Question 3

Question 1Draw conventional symbols for the following using appropriate colours where necessary.(i) Cart-track(ii) Broken ground(iii) Nala(iv) Perennial tank(v) Stream(vi) Dry-stream

Accepted Answer

Please refer to the full solution above.

Question 4

Question 5What advantages do contours have over hill-shading and hachuring?

Accepted Answer

Hill shading and hachuring only give an impression of the slope but do not indicate the heights of the land above sea level, whereas the contours show both impression of the slope as well as the heights of the land above the sea level.

Question 5

Question 6How do contour lines show different slopes of land?

Accepted Answer

The contour lines are shown by brown colour as thick brown lines and thin brown lines. Contour lines show:1. Elevation of land: The height of a contour is indicated by figures inserted in a break in the line.2. Steepness of its slope: When the contours are very close, they represent steep slopes. When they are farther apart, they represent gradually increasing slopes. Absence of contour lines indicate that the land is flat i.e., a low land.3. Shape of land at various heights: The contour lines indicate the shape of land. For example, almost circular contours whose value decreases inside represent a lake.

Question 6

Question 7What do you understand by V.I. and H.E.?

Accepted Answer

V.I. stands for vertical interval. It is the vertical distance between any two contour lines.H.E. stands for horizontal equivalent. It is the actual distance between two points on two contour lines.

Question 7

Question 8Give two points of difference between Bench Mark and Spot Height.

Accepted Answer

Bench MarkSpot HeightThese are marks etched on stone or a building to indicate the accurate height determined by surveys.It refers to the height of a point on the ground above the mean sea level.It is written as "BM" followed by a number.It is represented by a dot followed by a number on the map.

Question 8

Question 9Why do the contour of different heights not cross each other?

Accepted Answer

Two contours never intersect each other because each line represents a different height, and we can't have two different heights at the same point.

Question 9

Question 10How do the contour lines show the direction of the flow of rivers and streams?

Accepted Answer

Rivers and streams are shown on the map with blue colour. Generally water flows from higher altitude to lower altitude. Since the contours indicate the elevation of land, we can use them to find the direction of a river or stream.The rivers and streams usually flow from contours representing greater elevations to contours representing lower elevations. The course of a well-developed river can be divided into three stages - upper, middle and lower course; each of which can be recognised with the help of contour lines.

Question 10

Question 2Complete the following by drawing the conventional sign/symbol in the blank boxes:

Accepted Answer

Please refer to the full solution above.

Contours

Explain How Would You Distinguish Between The Following On The Basis Of Contours

Project Activity

Short Answer Questions

Symbols And Conventional Signs