Question

Statement (I): The counter interval depends upon the nature of the ground —whether it is undulating or flat.

Statement (II): In a hilly terrain or undulating ground a smaller interval is adopted, otherwise the contours will come too close for plotting due to the steep slope.

1. Both Statement (I) and Statement (II) are individually true and Statement (H) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (H) are individually true but Statement (II) is NOT the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false 
4. Statement (I) is false but Statement (II) is true

Answer 1

Correct Answer - Option 3 : Statement (I) is true but Statement (II) is false 

A contour means an imaginary line passing through points of equal elevation on the surface of earth.

Contour interval is the vertical elevation difference between any two consecutive contours.

Contour interval depends on following factors:

1. Scale of Map: It is inversely proportional to scale of map.

For Example, Consider following two scales: 1 cm = 10 m and 1 cm = 100 m. Out of these two scales, the large scale is 1 cm = 10 m as compared to 1 cm = 100 m and hence, contour interval for this will be smaller than that of latter scale.

2. Nature of Ground: For flat ground-contour interval is small and for steep slope contour interval is large, otherwise spacing between the contour lines will be less and it looks crowded.  

3. Purpose of Map or work:  For Ex.

a. For Highway or Railway projects the contour interval adopted- 2 m.

b. For earthworks, building work etc the contour interval  adopted- 0.5 m

c. For Geological Survey, the contour interval adopted- (6-15) m.