🎓 Day 40: Module 4 & 5 Integration Mastery Quiz
📝 DAY 40: MODULES 4‑5 QUIZ
⏱️ Estimated Reading Time: 25 Minutes | 🎓 Level: Professional Hydrographer
Test Your Knowledge – Advanced Processing, Volume, ADCP, Dredging & Sediment Mapping
Instructor: Engr. Rokib Hossain | River Warrior Academy
📖 Table of Contents
🧠 Self‑Assessment Quiz
Click "Show Answer" to check each response. Use the calculator below to tally your score.
1. Module 4‑5 Quiz (20 Questions)
Covering Days 31‑39: Chart creation, volume calculation, advanced analysis, time series, bridge scour, SSS processing, sediment classification, ADCP, dredge monitoring.
🔹 1. What is the recommended grid cell size for IHO Order 1a in shallow water (<10 m)?
- A) 2 m
- B) 0.5 m or smaller
- C) 5 m
- D) 10 m
🔹 2. Which gridding algorithm is recommended by IHO for robust bathymetric surface generation?
- A) Weighted average
- B) Nearest neighbour
- C) CUBE (Combined Uncertainty and Bathymetry Estimator)
- D) Kriging
🔹 3. What is the formula for discharge (Q) in a rectangular channel?
- A) Q = width × depth
- B) Q = velocity × area
- C) Q = area / velocity
- D) Q = width × velocity
🔹 4. In side scan sonar processing, what does slant range correction do?
- A) Increases gain at far range
- B) Converts slant distance to true horizontal distance
- C) Removes electrical noise
- D) Georeferences the image
🔹 5. Which sediment type typically produces the highest acoustic backscatter?
- A) Mud
- B) Silt
- C) Sand
- D) Rock / Gravel
🔹 6. What is the main advantage of using a moving‑boat ADCP over a stationary current meter?
- A) Lower cost
- B) Profiles velocity across the entire cross‑section quickly
- C) Works in zero flow
- D) No need for sound velocity
🔹 7. In a dredging contract, what is "over‑dredge allowance"?
- A) Extra depth permitted beyond design
- B) Minimum depth that must be achieved
- C) Swell factor
- D) Volume of wasted material
🔹 8. Which of the following is a valid method for ground‑truthing sediment classification?
- A) Using only backscatter intensity
- B) Grab sampling and grain size analysis
- C) Single‑beam echosounder
- D) Satellite imagery
🔹 9. What is the typical swell factor for sand dredging (in‑situ to loose)?
- A) 1.00
- B) 1.05‑1.10
- C) 1.10‑1.20
- D) 1.30‑1.40
🔹 10. In bridge scour inspection, what risk level corresponds to a measured scour depth that exceeds the foundation depth?
- A) Low
- B) Moderate
- C) High
- D) Critical
🔹 11. What does the acronym TPU stand for in hydrographic processing?
- A) Total Pressure Unit
- B) Total Propagated Uncertainty
- C) Transducer Power Unit
- D) Tidal Processing Unit
🔹 12. Which export format is preferred for archiving bathymetry with uncertainty?
- A) GeoTIFF
- B) JPEG
- C) BAG (Bathymetry Attributed Grid)
- D) PDF
🔹 13. In a time series analysis of bathymetry, if the depth trend shows a slope of +0.2 m/year, what does that indicate?
- A) Erosion (shallowing)
- B) Deposition (deepening)
- C) No change
- D) Instrument error
🔹 14. What is the minimum acceptable "percent good" for ADCP data?
- A) 30%
- B) 50%
- C) 70%
- D) 90%
🔹 15. Which of the following is NOT a standard element of a hydrographic chart layout?
- A) Scale bar
- B) North arrow
- C) Colour ramp legend
- D) GPS satellite count
🔹 16. What is the purpose of a hillshade layer on a bathymetric map?
- A) To show water depth
- B) To highlight seabed relief and topography
- C) To display tide levels
- D) To indicate sediment type
🔹 17. In dredge volume monitoring, what is the typical frequency of interim surveys for a large project?
- A) Once at the end
- B) Weekly or monthly
- C) Yearly
- D) Never
🔹 18. Which acoustic parameter is used to classify sediments in Qimera SonarClass?
- A) Sound velocity
- B) Backscatter intensity and derivatives
- C) Water depth
- D) Ping rate
🔹 19. What does the "Froude number" help predict in hydraulic engineering?
- A) Scour depth around piers
- B) Discharge measurement
- C) Wave height
- D) Sediment transport rate
🔹 20. When performing a moving‑boat ADCP discharge measurement, why are transects run in opposite directions?
- A) To increase boat speed
- B) To cancel compass misalignment errors
- C) To avoid obstacles
- D) To satisfy safety requirements
📊 Interactive Score Calculator
Enter the number of correct answers (out of 20) and see your rating:
Rating: --
18‑20 = Expert | 15‑17 = Proficient | 10‑14 = Review needed | <10 = Re‑study Modules 4‑5
2. Answer Key Summary
| Question | Correct Answer |
|---|---|
| 1 | B |
| 2 | C |
| 3 | B |
| 4 | B |
| 5 | D |
| 6 | B |
| 7 | A |
| 8 | B |
| 9 | C |
| 10 | D |
| 11 | B |
| 12 | C |
| 13 | B |
| 14 | C |
| 15 | D |
| 16 | B |
| 17 | B |
| 18 | B |
| 19 | A |
| 20 | B |
3. Recommended Resources for Review
4. Action Items & Next Steps
- 📌 Review any questions you missed by revisiting the corresponding day.
- 📌 Share your score in the comments and challenge fellow hydrographers.
- 📌 Proceed to Day 41: Sub‑Bottom Profiling Introduction.
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