1. A single contour line can split into two in case of a change in elevations.
a) true
b) false
Explanation: To contour lines having the same elevations cannot unite and continue as one line. Similarly, a single contour cannot split into two lines.
2. A contour line must close upon itself.
a) true
b) false
Explanation: A contour line must close upon itself. Though not necessarily within the limits of the maps.
3. Contour lines cross a watershed or ridge line at _____
a) 90°
b) 100°
c) 45°
d) 30°
Explanation: Contour lines cross a watershed or ridge line at right angles. The form curves of U shape round it with the concave side of the curve towards the higher ground.
4. What is the shape of contour lines in case of a valley?
a) U shape
b) V shape
c) W shape
d) O shape
Explanation: Contour lines cross a valley line at right angles. They form sharp curves of V shape across it with the convex side of the curve towards the higher ground.
5. The same contour appears on either sides of a ridge or valley, for the highest horizontal plane that interests the ridge must cut it on both sides.
a) true
b) false
Explanation: The same contour appears on either sides of a ridge or valley, for the highest horizontal plane that interests the ridge must cut it on both sides. The same is true in case of a lower horizontal plane that cuts a valley.
6. What is the shape of contour lines in case of a watershed?
a) U shape
b) V shape
c) W shape
d) O shape
Explanation: Contour lines cross a watershed or ridge line at right angles. The form curves of U shape around it with the concave side of the curve towards the higher ground.
7. What is the process of spacing the contours proportional between the plotted ground points established by indirect methods?
a) Interpolation
b) Tacheometric method
c) Cross section method
d) By squares method
Explanation: Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods.
8. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.
a) true
b) false
Explanation: Interpolation of the contours is the process of spacing the contours proportionately between the plotted ground points established by indirect methods. The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform.
9. Which of the following is not a chief method of Interpolation?
a) By estimation
b) By arithmetic calculation
c) By graphical method
d) By cross sections
Explanation: The methods of interpolation are based on the assumption that the slope of ground between the two points is uniform. The chief methods of Interpolation are by estimation, by arithmetic calculations, by graphical method.
10. Which of the following methods is extremely rough and is used for small scale work only?
a) By estimation
b) By arithmetic calculation
c) By graphical method
d) By cross sections
Explanation: Estimation method is extremely rough and is used for small scale work only. The positions of contour points between the guide points are located by estimation.