GIS For Engineering (MCQ) 4

Question 1

Which geoprocessing tool is used to extract a smaller dataset by overlaying a polygon boundary on another dataset, keeping only features inside the boundary?

Accepted Answer

Clip

Answer

Clip cuts input features using a polygon boundary, retaining only the portions of input features that fall within the clip boundary.

Question 2

An engineer must model underground utility networks in 3D. Which GIS data format supports true 3D geometry with Z coordinates and topology?

Accepted Answer

Geodatabase with multipatch features

Answer

ESRI File Geodatabases support multipatch and PolylineZ/PolygonZ feature classes that store true 3D geometry with topological rules enforced.

Question 3

What is a Digital Elevation Model (DEM) primarily derived from in modern large-scale engineering surveys?

Accepted Answer

LiDAR point clouds or SAR interferometry

Answer

Modern high-resolution DEMs are primarily derived from airborne LiDAR point clouds or spaceborne SAR interferometry (InSAR), which provide dense elevation measurements across large areas.

Question 4

In a GIS attribute join, what happens when multiple records in the join table share the same key value as a single feature in the target layer?

Accepted Answer

Only the first matching record is joined (one-to-one join)

Answer

A standard attribute join performs a one-to-one match; when multiple join table records share the same key, only the first match is used unless a relate or spatial join is applied instead.

Question 5

Which statement correctly describes the difference between raster resolution and raster extent?

Accepted Answer

Resolution is the cell size (e.g., 1 m/pixel); extent is the geographic area covered

Answer

Raster resolution refers to the ground dimension represented by one pixel (e.g., 30 m/pixel), while extent defines the geographic bounding box of the entire raster dataset.

GIS - Geographic Information System Practice Test

GIS - Geographic Information System Practice Test

GIS For Engineering (MCQ) 4