CSLB Landscaping (C-27) Trade Practice Test

样题与解析

以下是本题库中的部分真题与完整解析。完整题库请用上方的刷题工具。

1. 1. Irrigation

   A rotor sprinkler head throwing water 30 feet is BEST described as which type of irrigation component?

   • a.A micro-spray for shrub beds
   • b.A gear-driven rotor for large turf areas
   • c.A drip emitter for point-source watering
   • d.A bubbler for tree wells

   答案: b

   解析: Gear-driven rotors rotate a single stream back and forth and are designed for large open turf areas because of their long throw radius, typically 25 to 50 feet. Drip emitters, micro-sprays, and bubblers all deliver water at much shorter ranges for beds, shrubs, or trees.

2. 2. Planting & Soil

   Compost is added to soil primarily to do what?

   • a.To improve structure and add organic matter
   • b.To compact the soil around new plants
   • c.To serve as the only nutrient source
   • d.To raise pH to strongly alkaline levels

   答案: a

   解析: Compost improves soil structure, increases water and nutrient holding capacity, and feeds beneficial soil microorganisms. While it adds some nutrients, its main value is as an organic amendment that improves overall soil health. It benefits both sandy and clay soils.

3. 3. Safety

   Before any excavation or trenching in California, the law requires a contractor to do what?

   • a.Only notify the adjacent property owners
   • b.Wait 30 days before starting work
   • c.Dig a test hole first without notice
   • d.Contact DigAlert (811) to mark utilities

   答案: d

   解析: California Government Code section 4216 requires excavators to contact the regional one-call center, DigAlert (811), at least two working days before digging so utility owners can mark their buried lines. This prevents striking gas, electric, and other utilities. Failing to call can cause deadly accidents and legal liability.

   依据: Gov Code §4216 (DigAlert)

4. 4. Irrigation

   A single drip lateral runs from the bottom of a slope to the top of a 20-foot rise. Which emitter type keeps output even along that run?

   • a.Pressure-compensating emitters rated over a pressure range
   • b.Turbulent-flow emitters spaced at wider intervals up the run
   • c.Vortex emitters installed only on the upper half
   • d.Diaphragm emitters fed from a larger lateral

   答案: a

   解析: Pressure-compensating emitters hold a nearly constant discharge across a stated pressure band, which is exactly what a run that climbs 20 feet needs. Turbulent-flow emitters still put out more where pressure is higher regardless of spacing. Mixing emitter types on one lateral produces uneven output. A larger lateral reduces friction but does nothing about the elevation difference.

5. 5. Irrigation

   An older system is being retrofitted from spray heads to inline drip in the shrub beds. Which existing component most often has to be changed at the valve?

   • a.The zone needs a larger solenoid to open at lower flow
   • b.The zone needs a filter and a pressure regulator added
   • c.The zone needs its common wire replaced with heavier gauge
   • d.The zone needs the control valve relocated above the beds

   答案: b

   解析: Drip runs at low pressure and cannot tolerate particles, so a retrofit kit adding filtration and regulation at the valve is the standard change. Solenoids do not vary with flow. Wire gauge is unrelated to converting the piping. Relocating the valve uphill matters only for anti-siphon devices, not for a drip conversion.

6. 6. Planting & Soil

   A crew applies gypsum to a compacted clay pad that has normal sodium levels. What result should be expected?

   • a.Slow improvement, because gypsum must first lower soil pH
   • b.Rapid improvement, because gypsum increases infiltration on any soil
   • c.Little improvement, because the problem is compaction not sodium
   • d.Marked improvement, because gypsum loosens all clay soils

   答案: c

   解析: Gypsum corrects sodium-affected soils, and where sodium is not elevated it does very little, so the compacted pad still needs mechanical loosening and organic matter. It is not a general clay loosener, it does not raise infiltration on non-sodic soils, and it is not a pH-lowering material.

7. 7. Planting & Soil

   What is the practical purpose of a soil probe or auger in routine landscape maintenance?

   • a.To collect samples for the required soil management report
   • b.To measure the pH of the root zone in the field
   • c.To determine the compaction percentage of the subgrade
   • d.To check how deep applied water actually penetrated

   答案: d

   解析: Pulling a core after a cycle shows whether water reached the root zone or stopped a few inches down, which is the fastest way to correct a schedule. Field pH requires a test kit or meter. Compaction percentage requires a density test, not a hand probe. Samples for a formal report are collected to a laboratory protocol rather than casually.

8. 8. Hardscape & Grading

   A path exceeds five percent running slope on a commercial site. How is it then treated?

   • a.As a walk, with a coarse broom finish for traction
   • b.As a step, requiring risers to be added at regular intervals
   • c.As a ramp, with slope, landing, and handrail requirements
   • d.As a swale, since it will convey water along its length

   答案: c

   解析: Once running slope passes about five percent an accessible route is a ramp and picks up limits on slope and rise plus landings and handrails. Adding texture does not change the classification. A path is not a drainage feature by definition, and converting it to steps would remove accessibility rather than provide it.

9. 9. Planning & Estimating

   An owner asks for an additional planting bed after the contract is signed. How should the contractor handle it?

   • a.Absorb it to protect the relationship and recover it on the next job
   • b.Write a change order with the work and price, signed first
   • c.Add the work and bill it on the final invoice as extra
   • d.Add the work and increase the retention held at the end

   答案: b

   解析: A written, signed change order fixes the scope and price before the work is done and is the only reliable protection against a dispute at final billing. Adding it silently invites refusal to pay. Absorbing the cost is a gift with no mechanism for recovery. Retention is money the owner holds and is not a way to charge for extras.

10. 10. Safety

    An empty pesticide container is being prepared for disposal. What is the correct handling?

    • a.Puncture it and place it in the job site dumpster
    • b.Rinse it with clean water at the shop and pour the rinsate into a floor drain
    • c.Store it sealed until the next application uses the same product
    • d.Triple rinse it, add the rinsate to the spray tank, then dispose as directed

    答案: d

    解析: Triple rinsing recovers residue into the tank where it is used as intended, and the container is then disposed of according to the label and local rules. Putting an unrinsed container in a dumpster disposes of pesticide residue improperly. Rinsate poured into a drain enters the sewer. Refilling a container that was emptied is not a disposal method.