CSLB General Building (B) Trade Practice Test

Câu hỏi luyện tập mẫu

Một vài câu hỏi thực tế từ ngân hàng miễn phí này, kèm giải thích đầy đủ. Dùng công cụ luyện tập ở trên cho toàn bộ.

1. 1. Irrigation

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

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

   Đáp án: b

   Giải thích: 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. Irrigation

   A drip emitter rated at 1 GPH means it delivers approximately how much water per hour?

   • a.1 gallon per hour
   • b.1 gallon per minute
   • c.60 gallons per hour
   • d.1 quart per day

   Đáp án: a

   Giải thích: GPH stands for gallons per hour, so a 1 GPH emitter releases one gallon over a full hour of operation. Drip systems are rated in gallons per hour because they apply water slowly and precisely at the root zone. This low, slow application reduces runoff and evaporation.

3. 3. Irrigation

   Subsurface drip irrigation is especially useful in which situation?

   • a.Watering a steep concrete slope
   • b.On slopes and narrow strips where overspray and runoff must be avoided
   • c.Filling a decorative pond
   • d.Cooling a patio surface

   Đáp án: b

   Giải thích: Subsurface drip places emitter tubing below the soil surface, delivering water directly to roots with virtually no overspray or runoff. This makes it well suited for slopes and narrow strips where spray irrigation would waste water on pavement. It also reduces evaporation and weed germination at the surface.

4. 4. Planting & Soil

   Applying a 3-inch layer of organic mulch around plants primarily provides what benefits?

   • a.Raises soil pH sharply
   • b.Eliminates all irrigation needs
   • c.Conserves moisture, moderates soil temperature, and suppresses weeds
   • d.Increases soil compaction

   Đáp án: c

   Giải thích: A layer of organic mulch reduces evaporation, keeps soil temperatures more stable, and blocks light that weed seeds need to germinate. As it decomposes it also adds organic matter to the soil. Mulch is one of the most cost-effective water-saving practices in landscaping.

5. 5. Planting & Soil

   Compost is added to soil primarily to do what?

   • a.Raise pH to strongly alkaline levels
   • b.Improve soil structure, add organic matter, and support microbial life
   • c.Serve as the sole source of all nutrients permanently
   • d.Compact the soil

   Đáp án: b

   Giải thích: 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.

6. 6. Hardscape & Grading

   Aggregate base under hardscape is best compacted in what manner?

   • a.In one thick lift with no compaction
   • b.Only after the pavers are placed
   • c.In thin lifts (layers), each compacted before the next
   • d.By soaking it with water only

   Đáp án: c

   Giải thích: Base material should be placed and compacted in thin lifts, commonly around 3 to 4 inches, so the compactor can achieve full density throughout. Compacting one thick lift leaves the lower portion loose, causing later settlement. Layered compaction produces a stable, uniform base.

7. 7. Hardscape & Grading

   Compaction of subgrade soil before hardscape is measured against what standard reference?

   • a.The color of the soil
   • b.The soil's pH
   • c.The number of passes only
   • d.A percentage of maximum dry density (for example, 90 to 95 percent)

   Đáp án: d

   Giải thích: Compaction is specified as a percentage of a soil's maximum dry density determined by a laboratory Proctor test, commonly 90 to 95 percent for hardscape subgrade. Field testing verifies the soil reaches the required density. Adequate compaction prevents future settlement under pavement.

8. 8. Planning & Estimating

   To find the area of a circular planting bed with a 20-foot diameter, which calculation is correct?

   • a.20 x 20
   • b.3.14 x 20
   • c.2 x 3.14 x 10
   • d.3.14 x 10 x 10 (about 314 square feet)

   Đáp án: d

   Giải thích: Circle area equals pi times the radius squared, and the radius is half the diameter, so 10 feet. Thus 3.14 x 10 x 10 equals about 314 square feet. Using diameter instead of radius is a common estimating error.

9. 9. Safety

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

   • a.Only notify the property owner
   • b.Wait 30 days
   • c.Contact the regional notification center (DigAlert/811) to mark underground utilities
   • d.Dig a test hole first without notice

   Đáp án: c

   Giải thích: 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.

   Nguồn: Gov Code §4216 (DigAlert)

10. 10. Safety

    When mixing and applying pesticides, the label directions are legally significant because what?

    • a.They are only suggestions
    • b.They can be ignored by licensed applicators
    • c.They apply only to homeowners
    • d.The label is the law and must be followed exactly

    Đáp án: d

    Giải thích: Under pesticide regulations, the product label is a legal document, and using a pesticide in a manner inconsistent with its labeling is a violation. The label specifies rates, sites, PPE, and restrictions that must be followed exactly. This protects applicators, the public, and the environment.