101. What is the purpose of levelling in surveying?
a) To determine horizontal distances
b) To establish control points
c) To measure vertical distances
d) To create contour maps
View Answer
Correct answer: c) To measure vertical distances
Explanation: Levelling is used to determine the differences in elevation between points and measure vertical distances.
102. Which instrument is commonly used for precise levelling work?
a) Theodolite
b) Total station
c) Auto level
d) GPS receiver
View Answer
Correct answer: c) Auto level
Explanation: Auto levels are designed for precise levelling measurements, incorporating automatic compensators for accurate readings.
103. What is the main advantage of digital levels over traditional optical levels?
a) Higher accuracy
b) Faster measurements
c) Built-in GPS functionality
d) Ability to measure horizontal distances
View Answer
Correct answer: a) Higher accuracy
Explanation: Digital levels provide higher accuracy in levelling measurements compared to traditional optical levels.
104. Which levelling method is used to determine the difference in elevation between two points located far apart?
a) Differential levelling
b) Trigonometric levelling
c) Profile levelling
d) Fly levelling
View Answer
Correct answer: d) Fly levelling
Explanation: Fly levelling is used for determining elevation differences between points located at a considerable distance from each other.
105. In levelling, what is a benchmark?
a) A reference point with a known elevation
b) The instrument used for levelling measurements
c) The process of measuring horizontal distances
d) A device used for measuring angles
View Answer
Correct answer: a) A reference point with a known elevation
Explanation: A benchmark is a fixed point with a known elevation used as a reference for levelling measurements.
106. Which levelling technique is used to check the accuracy of levelling instruments?
a) Backsighting
b) Foresighting
c) Change point method
d) Check levelling
View Answer
Correct answer: d) Check levelling
Explanation: Check levelling is used to verify the accuracy of levelling instruments by comparing the results with known benchmarks.
107. Which levelling method is commonly used for determining elevation differences along a specific line or profile?
a) Differential levelling
b) Trigonometric levelling
c) Profile levelling
d) Fly levelling
View Answer
Correct answer: c) Profile levelling
Explanation: Profile levelling is used to determine elevation differences along a specific line or profile, such as a road or railway track.
108. What is the purpose of a levelling staff in levelling measurements?
a) To measure horizontal distances
b) To measure vertical distances
c) To measure angles
d) To measure slope distances
View Answer
Correct answer: b) To measure vertical distances
Explanation: A levelling staff is used to measure the vertical distances between the instrument and the ground or benchmark.
109. Which levelling technique is used to determine the difference in elevation between two points without using a levelling instrument?
a) Trigonometric levelling
b) Fly levelling
c) Differential levelling
d) Indirect levelling
View Answer
Correct answer: a) Trigonometric levelling
Explanation: Trigonometric levelling uses trigonometric calculations based on measured vertical angles and horizontal distances to determine elevation differences.
110. What is the purpose of a leveling bubble in levelling instruments?
a) To provide stable and accurate readings
b) To measure horizontal angles
c) To measure slope distances
d) To determine the instrument’s position on the Earth’s surface
View Answer
Correct answer: a) To provide stable and accurate readings
Explanation: The leveling bubble is used to ensure that the instrument is properly leveled, resulting in stable and accurate readings during levelling measurements.
