PS Topographic & Contour Mapping 2

Question 1

A contour line crosses a stream valley in what characteristic shape?

Accepted Answer

V-shape pointing upstream

Answer

Contour lines form V-shapes that point upstream (uphill) when crossing stream valleys because the stream cuts downward into the terrain.

Question 2

On a topographic map, contour lines that are spaced very close together indicate:

Accepted Answer

Steep slopes

Answer

Closely spaced contour lines represent steep terrain because the elevation changes rapidly over a short horizontal distance.

Question 3

What is the standard contour interval for a USGS 7.5-minute quadrangle map covering hilly terrain?

Accepted Answer

20 feet

Answer

USGS 7.5-minute quadrangles of hilly terrain typically use a 20-foot contour interval to balance readability and detail.

Question 4

An index contour differs from intermediate contours in that it is:

Accepted Answer

Drawn with a heavier line and labeled with elevation

Answer

Index contours are drawn with heavier lines and labeled with their elevation values, typically every fifth contour, to aid map reading.

Question 5

When performing a topographic survey using total station equipment, what does the term 'side shot' refer to?

Accepted Answer

A single foresight observation not used as a backsight

Answer

A side shot is a single observation taken to collect data (such as terrain features) that is not subsequently used as a backsight in the traverse.

(PS) Professional Licensed Surveyor Practice Test