311. What is contouring in surveying?
a) Measuring horizontal distances
b) Measuring vertical distances
c) Determining elevations of points on the ground
d) Determining azimuth angles
View Answer
Correct answer: c) Determining elevations of points on the ground
Explanation: Contouring is the process of determining the elevations of points on the ground and representing them as contour lines on a map.
312. Contour lines on a topographic map represent:
a) Slopes
b) Distances
c) Directions
d) Elevations
View Answer
Correct answer: d) Elevations
Explanation: Contour lines on a topographic map represent points of equal elevation.
313. The distance between two contour lines on a map is known as:
a) Gradient
b) Slope
c) Contour interval
d) Topographic relief
View Answer
Correct answer: c) Contour interval
Explanation: The contour interval is the vertical distance between two contour lines on a map.
314. The contour interval is determined based on:
a) The map scale
b) The size of the area being surveyed
c) The accuracy of the elevation measurements
d) The terrain characteristics
View Answer
Correct answer: d) The terrain characteristics
Explanation: The contour interval is determined based on the terrain characteristics of the area being surveyed, such as the steepness of slopes and the level of detail required.
315. When contour lines are close together, it indicates:
a) A flat area
b) A gentle slope
c) A steep slope
d) A valley
View Answer
Correct answer: c) A steep slope
Explanation: When contour lines are close together, it indicates a steep slope or a change in elevation.
316. The contour line that represents the highest elevation on a map is called the:
a) Benchmark
b) Spot elevation
c) Contour index
d) Contour line of depression
View Answer
Correct answer: a) Benchmark
Explanation: A benchmark is a point of known elevation, usually represented by a dot and an elevation value, and it is often located at the highest point on a map.
317. What is the purpose of spot elevations on a topographic map?
a) To indicate the presence of depressions
b) To provide elevations of specific points
c) To show the direction of flow of water bodies
d) To represent contour lines more accurately
View Answer
Correct answer: b) To provide elevations of specific points
Explanation: Spot elevations on a topographic map are used to provide precise elevations of specific points of interest.
318. Contour lines that form closed loops with hatched areas inside represent:
a) Ridge lines
b) Valleys
c) Depression contours
d) Spot elevations
View Answer
Correct answer: c) Depression contours
Explanation: Contour lines that form closed loops with hatched areas inside represent depressions or low-lying areas on the ground.
319. Which of the following methods is commonly used for contouring large areas?
a) Direct levelling
b) Trilateration
c) Photogrammetry
d) Resection
View Answer
Correct answer: c) Photogrammetry
Explanation: Photogrammetry, using aerial photographs, is a commonly used method for contouring large areas.
320. The process of interpolating contour lines between known elevations is called:
a) Spotting
b) Filling
c) Grading
d) Interpolation
View Answer
Correct answer: d) Interpolation
Explanation: Interpolation is the process of estimating or determining elevations between known contour lines.
