LSIT Surveying Fundamentals 3

Question 1

What is the primary purpose of a benchmark (BM) in surveying?

Accepted Answer

A point of known elevation used as a reference

Answer

A benchmark is a permanent point with a known elevation that serves as a vertical datum reference for leveling surveys.

Question 2

In differential leveling, a 'backsight' reading is taken to:

Accepted Answer

Establish the height of instrument (HI) from a known elevation

Answer

A backsight is read on a point of known elevation to compute the height of instrument (HI = known elevation + BS reading).

Question 3

Which of the following best describes 'closure error' in a traverse?

Accepted Answer

The difference between computed and starting coordinates after the loop is closed

Answer

Closure error is the linear distance between the computed end position and the starting position when a closed traverse is calculated.

Question 4

The term 'latitudes and departures' in traverse calculations refers to:

Accepted Answer

North-south and east-west components of a traverse course

Answer

Latitude is the north-south component and departure is the east-west component of each traverse course, used to compute coordinate changes.

Question 5

A surveyor measures a slope distance of 250.00 ft at a vertical angle of +5°. What is the approximate horizontal distance?

Accepted Answer

248.98 ft

Answer

Horizontal distance = slope distance × cos(vertical angle) = 250.00 × cos(5°) ≈ 250.00 × 0.99619 ≈ 248.98 ft.

(LSIT) Land Surveyor in Training Practice Test