Remote Sensing and GIS in Geological Engineering MCQs Questions & Answers

21

What is the main advantage of using LiDAR in geological engineering?

A) Detecting thermal variations B) Producing high-resolution 3D terrain models C) Measuring soil moisture content D) Mapping spectral reflectance

Discuss

Answer & Solution

Answer: Option B

Solution:

LiDAR (Light Detection and Ranging) provides precise 3D measurements of surface topography by measuring laser pulse returns.This is critical for detailed terrain modeling, landslide detection, and infrastructure planning.

22

Which of the following is NOT a typical component of a GIS system?

A) Hardware B) Software C) Remote sensors D) Data

Discuss

Answer & Solution

Answer: Option C

Solution:

Remote sensors provide data but are not part of the GIS system itself.GIS components include hardware, software, data, people, and procedures.

23

What does supervised classification in remote sensing involve?

A) Classifying pixels based on random assignment B) Using known training areas to classify unknown pixels C) Using only infrared bands for classification D) Classifying images manually without software

Discuss

Answer & Solution

Answer: Option B

Solution:

Supervised classification uses training data from known land cover types to classify other pixels automatically.This improves accuracy by leveraging prior knowledge.

24

Which spectral range is MOST useful for identifying mineral compositions in geological remote sensing?

A) Visible light (400-700 nm) B) Near-infrared (700-1400 nm) C) Thermal infrared (3-14 �m) D) Microwave

Discuss

Answer & Solution

Answer: Option C

Solution:

Thermal infrared detects emitted heat and is sensitive to mineralogical differences due to their thermal properties.It is valuable in mineral exploration.

25

What type of data visualization in GIS displays continuous surfaces like elevation or temperature?

A) Choropleth maps B) Dot density maps C) Contour maps D) Pie charts

Discuss

Answer & Solution

Answer: Option C

Solution:

Contour maps connect points of equal value to represent continuous surface variations.They are widely used in geology and engineering for topography.

26

In remote sensing, what does spatial resolution refer to?

A) The frequency of data acquisition B) The size of the area represented by one pixel C) The number of spectral bands D) The altitude of the satellite

Discuss

Answer & Solution

Answer: Option B

Solution:

Spatial resolution is the ground area covered by each pixel.Higher spatial resolution means finer detail and smaller pixel size.

27

Which GIS operation would you use to find all features within a certain distance of a road?

A) Buffering B) Overlay C) Georeferencing D) Digitizing

Discuss

Answer & Solution

Answer: Option A

Solution:

Buffering creates zones around features such as roads to analyze proximity.This is important in impact assessments and planning.

28

Which remote sensing platform provides the highest spatial resolution data?

A) UAV (drones) B) Satellites C) Aircraft D) Ground-based sensors

Discuss

Answer & Solution

Answer: Option A

Solution:

UAVs or drones fly at low altitudes, enabling very high spatial resolution images compared to satellites or aircraft.They are increasingly used in detailed site studies.

29

What is georeferencing in GIS?

A) Converting raster data to vector data B) Assigning real-world coordinates to spatial data C) Combining multiple data layers D) Creating 3D terrain models

Discuss

Answer & Solution

Answer: Option B

Solution:

Georeferencing links spatial data to locations on the Earth's surface using coordinate systems.This is essential for integrating diverse datasets.

30

Which of the following best describes DEM (Digital Elevation Model)?

A) A model showing underground structures B) A raster dataset representing ground surface elevations C) A vector dataset of geological faults D) A map of soil types

Discuss

Answer & Solution

Answer: Option B

Solution:

DEM is a raster representation of terrain elevations used extensively in hydrological modeling, slope analysis, and construction planning.

Remote Sensing and GIS in Geological Engineering MCQs Questions & Answers | Geological Engineering