North Carolina Irrigation Contractor Examinations — Level I & II 200
Practice Questions and Verified Answers with Rationales
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EXAM OVERVIEW
The North Carolina Irrigation Contractors' Licensing Board (NCICLB) oversees the licensing of
irrigation contractors in the state. The licensing exam is divided into three sections, each of
which must be passed independently.
| Section | Subject Area | Questions | Passing Score |
|---------|--------------|-----------|----------------|
| 1 | Water Efficiency / Conservation | 50 | 70% |
| 2 | Irrigation Contracting / Construction | 60 | 70% |
| 3 | Basic Business Skills | 40 | 70% |
Format: Open book (paper references only, no electronics), 150 total questions, 4‑hour time
limit.
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SECTION 1: WATER EFFICIENCY / CONSERVATION (Questions 1‑50)
1. What is the primary purpose of an irrigation system?
A) Control soil erosion
,B) Supply water to plants efficiently
C) Reduce fertilizer usage
D) Prevent pest infestations
Correct Answer: B
Rationale: Efficient irrigation systems are designed to deliver water directly to plants where and
when needed, minimizing waste while supporting healthy growth.
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2. Which type of irrigation is most efficient for shrubs, flower beds, and individual trees?
A) Rotor sprinklers
B) Drip irrigation
C) Impact sprinklers
D) Flood irrigation
Correct Answer: B
Rationale: Drip systems apply water slowly and directly to the root zone, reducing evaporation
and runoff. This makes them ideal for non‑turf areas and for maximizing water efficiency.
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3. A backflow preventer is required on an irrigation system to:
,A) Maintain consistent water pressure
B) Prevent contamination of the potable water supply
C) Filter sediment out of the water
D) Control water temperature
Correct Answer: B
Rationale: Backflow preventers create a physical barrier that stops irrigation water, which may
contain fertilizers or soil, from being siphoned back into the drinking water supply.
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4. Which soil type has the fastest drainage rate?
A) Clay
B) Silt
C) Sand
D) Loam
Correct Answer: C
Rationale: Sand particles are large and irregular, creating large pore spaces that allow water to
move downward quickly. Clay and silt have smaller particles and slower drainage.
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5. What is the function of a rain sensor in an irrigation system?
, A) Measure humidity levels
B) Control soil pH
C) Shut off irrigation during rainfall
D) Detect leaks in the system
Correct Answer: C
Rationale: A rain sensor interrupts the irrigation schedule when a preset amount of rainfall has
occurred, preventing unnecessary watering and saving water.
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6. Which grass type is most drought‑tolerant?
A) Kentucky Bluegrass
B) Bermuda Grass
C) Fine Fescue
D) Ryegrass
Correct Answer: B
Rationale: Bermuda grass has deep roots and goes dormant during dry periods, allowing it to
survive extended droughts much better than cool‑season grasses.
---
Practice Questions and Verified Answers with Rationales
---
EXAM OVERVIEW
The North Carolina Irrigation Contractors' Licensing Board (NCICLB) oversees the licensing of
irrigation contractors in the state. The licensing exam is divided into three sections, each of
which must be passed independently.
| Section | Subject Area | Questions | Passing Score |
|---------|--------------|-----------|----------------|
| 1 | Water Efficiency / Conservation | 50 | 70% |
| 2 | Irrigation Contracting / Construction | 60 | 70% |
| 3 | Basic Business Skills | 40 | 70% |
Format: Open book (paper references only, no electronics), 150 total questions, 4‑hour time
limit.
---
SECTION 1: WATER EFFICIENCY / CONSERVATION (Questions 1‑50)
1. What is the primary purpose of an irrigation system?
A) Control soil erosion
,B) Supply water to plants efficiently
C) Reduce fertilizer usage
D) Prevent pest infestations
Correct Answer: B
Rationale: Efficient irrigation systems are designed to deliver water directly to plants where and
when needed, minimizing waste while supporting healthy growth.
---
2. Which type of irrigation is most efficient for shrubs, flower beds, and individual trees?
A) Rotor sprinklers
B) Drip irrigation
C) Impact sprinklers
D) Flood irrigation
Correct Answer: B
Rationale: Drip systems apply water slowly and directly to the root zone, reducing evaporation
and runoff. This makes them ideal for non‑turf areas and for maximizing water efficiency.
---
3. A backflow preventer is required on an irrigation system to:
,A) Maintain consistent water pressure
B) Prevent contamination of the potable water supply
C) Filter sediment out of the water
D) Control water temperature
Correct Answer: B
Rationale: Backflow preventers create a physical barrier that stops irrigation water, which may
contain fertilizers or soil, from being siphoned back into the drinking water supply.
---
4. Which soil type has the fastest drainage rate?
A) Clay
B) Silt
C) Sand
D) Loam
Correct Answer: C
Rationale: Sand particles are large and irregular, creating large pore spaces that allow water to
move downward quickly. Clay and silt have smaller particles and slower drainage.
---
5. What is the function of a rain sensor in an irrigation system?
, A) Measure humidity levels
B) Control soil pH
C) Shut off irrigation during rainfall
D) Detect leaks in the system
Correct Answer: C
Rationale: A rain sensor interrupts the irrigation schedule when a preset amount of rainfall has
occurred, preventing unnecessary watering and saving water.
---
6. Which grass type is most drought‑tolerant?
A) Kentucky Bluegrass
B) Bermuda Grass
C) Fine Fescue
D) Ryegrass
Correct Answer: B
Rationale: Bermuda grass has deep roots and goes dormant during dry periods, allowing it to
survive extended droughts much better than cool‑season grasses.
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