Interview questions on Remote Sensing and Image Processing in Hydrology

Twenty MCQ which is common in not only interviews but also in different competetive examinations including GATE

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📡 Remote Sensing, Image Processing & Hydrology – MCQs with Answers

🌍 Section 1: Remote Sensing Fundamentals

1. What is remote sensing?

   1. Measuring objects by physical contact

   2. Observing objects from a distance using sensors ✅

   3. Using GPS to navigate

   4. Mapping underground water

2. Which of the following is a passive remote sensing system?

   1. Radar

   2. LiDAR

   3. Thermal infrared sensor ✅

   4. SONAR

3. Which satellite sensor is commonly used for land and water resource monitoring?

   1. MODIS ✅

   2. GPS

   3. INSAT

   4. GOES

4. Which electromagnetic band is most useful for detecting vegetation health?

   1. Microwave

   2. Near-infrared ✅

   3. Ultraviolet

   4. X-ray

5. Which satellite provides high-resolution imagery suitable for hydrological modeling?

   1. Landsat 8 ✅

   2. NOAA

   3. INSAT-3D

   4. SPOT

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🖼️ Section 2: Image Processing Techniques

6. What is the purpose of image classification in remote sensing?

   1. To compress images

   2. To convert raster to vector

   3. To categorize land cover types ✅

   4. To enhance image resolution

7. Which of the following is an unsupervised classification method?

   1. Maximum Likelihood

   2. Support Vector Machine

   3. K-means clustering ✅

   4. Random Forest

8. What does NDVI stand for?

   1. Normalized Difference Vegetation Index ✅

   2. National Digital Vegetation Index

   3. Normalized Data Visualization Interface

   4. Natural Drainage and Vegetation Index

9. Which image enhancement technique improves contrast in satellite images?

   1. Histogram equalization ✅

   2. Edge detection

   3. Band ratioing

   4. Resampling

10. Which software is commonly used for remote sensing image processing?

    1. AutoCAD

    2. ERDAS Imagine ✅

    3. Excel

    4. SPSS