C27 LICENSE Study Guide 2026
Everything you need to pass the C27 LICENSE exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 C27 LICENSE Exam Format at a Glance
📚 C27 LICENSE Topics to Study (21)
✍️ Sample C27 LICENSE Questions & Answers
1. Under California Department of Pesticide Regulation (CDPR) rules, what is the general buffer zone requirement when applying pesticides adjacent to bodies of water?
Buffer zone requirements are pesticide-specific and found on the product label; applicators must comply with label directions and state regulations to prevent pesticide runoff into water bodies.
2. Which turfgrass disease is characterized by roughly circular patches of brown or dead grass, often with a 'frog-eye' pattern?
Necrotic ring spot (Ophiosphaerella korrae) produces circular to ring-shaped patches of dead turf with a characteristic frog-eye pattern in the center.
3. What is the recommended soil amendment incorporation depth for turf removal and drought-tolerant replanting projects?
For turf replacement projects, soil amendments should be incorporated to a depth of 6 inches to meaningfully improve water retention, drainage, and root penetration.
4. When pouring a new concrete patio, a contractor forms or cuts shallow grooves into the slab at regular intervals. What is the main purpose of these grooves, known as control joints?
Control joints (or contraction joints) are intentionally created weak points in a concrete slab. As concrete cures and shrinks, it is prone to cracking. Control joints are designed to predetermine the location of these cracks, encouraging them to form in a neat, straight line along the groove rather than randomly across the slab's surface, thus maintaining structural integrity and appearance.
5. When constructing a segmental retaining wall, what is the term for the intentional backward lean or slope of the wall face designed to improve its stability against overturning?
The correct term is 'batter,' which refers to the designed, slight backward inclination of a retaining wall's face. This lean uses gravity to help the wall resist the lateral pressure of the soil it is retaining, increasing its overall stability. A common batter is 1 inch of setback for every 12 inches of height.
6. What does 'substantial completion' mean in a construction contract?
Substantial completion is the point at which the project is complete enough for the owner to occupy or use it for its intended purpose, triggering key contractual timelines and rights.