131. Which levelling instrument accessory is used to measure horizontal angles?
a) Theodolite
b) Leveling staff
c) Target reflector
d) Prism pole
View Answer
Correct answer: a) Theodolite
Explanation: The theodolite is a surveying instrument used for measuring horizontal and vertical angles in addition to levelling measurements.
132. Which levelling technique is used to determine the difference in elevation between two points using trigonometric calculations?
a) Differential levelling
b) Trigonometric levelling
c) Fly levelling
d) Barometric levelling
View Answer
Correct answer: b) Trigonometric levelling
Explanation: Trigonometric levelling involves using vertical angles and horizontal distances to calculate elevation differences between two points.
133. What is the purpose of a target reflector in levelling measurements?
a) To provide stable and accurate readings
b) To measure horizontal angles
c) To measure slope distances
d) To enhance visibility of the staff readings
View Answer
Correct answer: d) To enhance visibility of the staff readings
Explanation: A target reflector is used to improve the visibility of the staff readings, especially over long distances or in low-light conditions.
134. 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.
135. 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.
136. 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.
137. 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.
138. Which levelling technique is used when the ground profile is not suitable for direct levelling?
a) Differential levelling
b) Trigonometric levelling
c) Barometric levelling
d) Indirect levelling
View Answer
Correct answer: d) Indirect levelling
Explanation: Indirect levelling involves using a series of intermediate points to indirectly determine elevation differences when direct levelling is not possible or practical.
139. What is the purpose of a staff bubble in levelling measurements?
a) To provide stable and accurate readings
b) To measure vertical angles
c) To measure horizontal distances
d) To determine the staff’s position on the Earth’s surface
View Answer
Correct answer: a) To provide stable and accurate readings
Explanation: The staff bubble is used to ensure that the levelling staff is held vertically, providing stable and accurate readings of the vertical distances.
140. Which levelling instrument accessory is used to measure horizontal angles?
a) Theodolite
b) Leveling staff
c) Target reflector
d) Prism pole
View Answer
Correct answer: a) Theodolite
Explanation: The theodolite is a surveying instrument used for measuring horizontal and vertical angles in addition to levelling measurements.
