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CA Landscape practice questions

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Question 1Plan Reading, Estimating, and Bidding

A plan is drawn at a scale of 1 inch = 20 feet. A line on the plan measures 3.5 inches. What distance does it represent on the ground?

  1. 70 feet Correct answer.
  2. 80 feet
  3. 60 feet
  4. 90 feet

Explanation

Multiply the scaled length by the scale factor: 3.5 inches × 20 feet per inch = 70 feet. The graphic scale can also be used directly by stepping off the same distance.

Question 2Plan Reading, Estimating, and Bidding

What is the primary purpose of the north arrow on a landscape plan?

  1. To establish the drawing scale
  2. To locate the benchmark elevation
  3. To show the site's orientation Correct answer.
  4. To mark the property boundary

Explanation

The north arrow establishes which direction is north so that the site can be oriented correctly on the drawing and in the field. It does not set scale, boundaries, or elevations.

Question 3Plan Reading, Estimating, and Bidding

On a topographic plan, closely spaced contour lines indicate what condition?

  1. A drainage swale
  2. A constant elevation line
  3. A steep slope Correct answer.
  4. A perfectly flat area

Explanation

Contour lines connect points of equal elevation. Where they are close together, elevation changes rapidly over a short horizontal distance, which defines a steep slope.

Question 4Plan Reading, Estimating, and Bidding

On a grading plan, what does a spot elevation represent?

  1. A line of equal elevation
  2. A drainage area boundary
  3. A benchmark outside the site
  4. A specific proposed elevation Correct answer.

Explanation

A spot elevation gives the proposed or existing elevation at one exact point, usually shown as a number with a decimal. It is not a contour line or a boundary.

Question 5Plan Reading, Estimating, and Bidding

What information does the legend on a construction plan provide?

  1. A schedule of unit prices
  2. A list of bidders
  3. A summary of change orders
  4. A key to plan symbols Correct answer.

Explanation

The legend, sometimes called the key, identifies the symbols, line types, and abbreviations used on the drawing. It allows the reader to interpret the plan consistently.

Question 6Plan Reading, Estimating, and Bidding

What does a bid bond guarantee to the owner?

  1. Covers defects after completion
  2. Guarantees contract execution Correct answer.
  3. Establishes the project schedule
  4. Sets the final contract price

Explanation

A bid bond assures the owner that the successful bidder will enter into the contract and provide the required performance and payment bonds. If the bidder fails to do so, the surety may be liable up to the bond amount.

Question 7Plan Reading, Estimating, and Bidding

An addendum issued during the bidding period is intended to do what?

  1. Modify bid documents before opening Correct answer.
  2. Approve a contractor's payment request
  3. Award the contract to the low bidder
  4. Record as-built conditions

Explanation

An addendum clarifies, corrects, or changes the bidding documents before bids are opened. Bidders must acknowledge addenda in their bids.

Question 8Plan Reading, Estimating, and Bidding

A proposed walkway falls at a uniform slope of 2% over a horizontal distance of 150 feet. What is the total vertical drop?

  1. 1.5 feet
  2. 3.0 feet Correct answer.
  3. 2.5 feet
  4. 2.0 feet

Explanation

Slope is rise over run: 2% means 0.02 feet of drop per horizontal foot. Multiply 150 feet by 0.02 to get 3.0 feet of drop.

Question 9Plan Reading, Estimating, and Bidding

At a given point, the proposed grade is lower than the existing grade. What earthwork does this condition require?

  1. Riprap
  2. Cut Correct answer.
  3. Fill
  4. Overexcavation

Explanation

Cut removes soil where the proposed surface is below existing ground. Fill is placed where the proposed surface is above existing ground.

Question 10Plan Reading, Estimating, and Bidding

A rectangular planting bed measures 24 feet by 50 feet. How many square yards does it contain?

  1. 150.0 sy
  2. 120.0 sy
  3. 166.7 sy
  4. 133.3 sy Correct answer.

Explanation

First find square feet: 24 × 50 = 1,200 square feet. There are 9 square feet in a square yard, so 1,200 ÷ 9 = 133.3 square yards.

Question 11Plan Reading, Estimating, and Bidding

A takeoff shows 200 square feet of sod required. With a 5% waste factor, how much sod should be ordered?

  1. 205 sf
  2. 208 sf
  3. 220 sf
  4. 210 sf Correct answer.

Explanation

A waste factor adds extra material for cuts, overlaps, and damage. Multiply 200 square feet by 1.05 to get 210 square feet.

Question 12Plan Reading, Estimating, and Bidding

How many cubic yards of base material are needed to cover 1,000 square feet at a depth of 4 inches?

  1. 15.4 cy
  2. 18.5 cy
  3. 12.3 cy Correct answer.
  4. 24.7 cy

Explanation

Convert depth to feet: 4 inches ÷ 12 = 0.333 feet. Volume is 1,000 × 0.333 = 333.3 cubic feet, and 333.3 ÷ 27 = 12.3 cubic yards.

Question 13Plan Reading, Estimating, and Bidding

Station 12+50 represents what distance from the project baseline?

  1. 1,205 ft
  2. 1,225 ft
  3. 1,250 ft Correct answer.
  4. 1,240 ft

Explanation

Stationing is written as stations plus feet, where each full station is 100 feet. Station 12+50 equals 12 × 100 + 50 = 1,250 feet.

Question 14Plan Reading, Estimating, and Bidding

A drawing uses an engineer's scale of 1 inch = 10 feet. A line measures 4.25 inches on the drawing. What ground distance does it represent?

  1. 42.5 ft Correct answer.
  2. 52.5 ft
  3. 45.0 ft
  4. 47.5 ft

Explanation

Multiply the measured length by the scale: 4.25 inches × 10 feet per inch = 42.5 feet.

Question 15Plan Reading, Estimating, and Bidding

Which drawing type shows the vertical face of a wall or building as seen from the side?

  1. Section
  2. Detail
  3. Plan view
  4. Elevation Correct answer.

Explanation

An elevation is an orthographic view of a vertical surface, showing heights and finishes. A plan is a view from above.

Question 16Plan Reading, Estimating, and Bidding

What does a section drawing primarily show?

  1. A cut-through of construction Correct answer.
  2. The site as seen from above
  3. The bid item schedule
  4. The legal property boundary

Explanation

A section represents a vertical cut through an assembly or site, exposing layers and internal relationships. It is useful for showing construction depths and connections.

Question 17Plan Reading, Estimating, and Bidding

In the MasterFormat system, Division 31 covers which category of work?

  1. Metals
  2. Electrical
  3. Earthwork Correct answer.
  4. Concrete

Explanation

MasterFormat Division 31 is Earthwork, which includes clearing, grading, excavation, and fill. Division 32 covers exterior improvements such as planting and paving.

Question 18Plan Reading, Estimating, and Bidding

A bid item priced per cubic yard of excavation is best described as what?

  1. An alternate bid
  2. A contingency bid
  3. A lump-sum bid
  4. A unit-price bid Correct answer.

Explanation

A unit-price item is priced per unit of measurement, and the final payment depends on the actual quantity installed. Lump-sum bids cover a defined scope for one total price.

Question 19Plan Reading, Estimating, and Bidding

What is the purpose of a request for information (RFI)?

  1. To clarify documents Correct answer.
  2. To certify payment
  3. To request a change order
  4. To submit a bid

Explanation

An RFI asks the designer or owner to clarify or explain ambiguous or missing information in the contract documents. The response becomes part of the project record and may lead to a change order if cost or time is affected.

Question 20Plan Reading, Estimating, and Bidding

Contours are drawn at 2-foot intervals. A point lies one-quarter of the way from the 106 contour toward the 108 contour. What is the estimated elevation?

  1. 106.5 Correct answer.
  2. 106.4
  3. 107.0
  4. 106.2

Explanation

Interpolate linearly between the two contours: the elevation difference is 2 feet, and one-quarter of that is 0.5 feet. Add 0.5 to 106 to estimate 106.5.

Question 21Plan Reading, Estimating, and Bidding

Using the average end area method, a trench has end areas of 40 square feet and 60 square feet over a length of 100 feet. What is the volume in cubic yards?

  1. 148.1 cy
  2. 185.2 cy Correct answer.
  3. 166.7 cy
  4. 175.0 cy

Explanation

Average the end areas: (40 + 60) ÷ 2 = 50 square feet. Multiply by length: 50 × 100 = 5,000 cubic feet, then divide by 27 to get 185.2 cubic yards.

Question 22Plan Reading, Estimating, and Bidding

The base bid is $250,000. Alternate 1 adds $18,000, and Alternate 2 deducts $7,000. The owner accepts both alternates. What is the contract amount?

  1. $261,000 Correct answer.
  2. $243,000
  3. $268,000
  4. $275,000

Explanation

Add accepted add alternates and subtract accepted deduct alternates from the base bid: $250,000 + $18,000 − $7,000 = $261,000.

Question 23Plan Reading, Estimating, and Bidding

A contract is for $400,000 with 10% retainage. Work totaling $120,000 has been completed, and no payments have been made. What payment is due on the first application?

  1. $108,000 Correct answer.
  2. $112,000
  3. $120,000
  4. $100,000

Explanation

Retainage is withheld from each payment: 10% of $120,000 is $12,000. Subtract that from the completed work value to get $108,000 due.

Question 24Plan Reading, Estimating, and Bidding

Spot elevations at two points 50 feet apart are 104.2 and 101.7. What is the average slope between them?

  1. 7.5%
  2. 2.5%
  3. 4.0%
  4. 5.0% Correct answer.

Explanation

The elevation difference is 104.2 − 101.7 = 2.5 feet over a 50-foot run. Slope is 2.5 ÷ 50 = 0.05, or 5.0%.

Question 25Site Evaluation, Soils, and Drainage

A soil's textural class is determined by the relative percentages of which three particle sizes?

  1. Sand, silt, and clay Correct answer.
  2. Gravel, sand, and silt
  3. Silt, clay, and organic matter
  4. Sand, clay, and gravel

Explanation

Soil texture is based on the mineral particle-size separates sand, silt, and clay as defined in the USDA classification. Gravel and organic matter are not part of the three-part texture triangle used to name soil textural classes.

Question 26Site Evaluation, Soils, and Drainage

On the standard soil pH scale, what value represents a neutral soil?

  1. 14.0
  2. 7.0 Correct answer.
  3. 9.0
  4. 5.0

Explanation

The pH scale runs from 0 to 14, with 7.0 being neutral. Values below 7.0 are acidic, and values above 7.0 are alkaline.

Question 27Site Evaluation, Soils, and Drainage

What is the primary function of a French drain in a landscape?

  1. To store roof runoff for irrigation
  2. To support a retaining wall footing
  3. To add organic matter to a slope
  4. To redirect subsurface water away Correct answer.

Explanation

A French drain is a gravel-filled trench, often containing perforated pipe, that intercepts and carries subsurface water away from wet areas. It manages groundwater rather than storing irrigation water or providing structural support.

Question 28Site Evaluation, Soils, and Drainage

Which soil particle size is the largest?

  1. Organic matter
  2. Clay
  3. Silt
  4. Sand Correct answer.

Explanation

Sand particles are larger than silt and clay, ranging roughly from 0.05 to 2 mm in diameter. Silt is finer than sand, and clay is the finest mineral separate.

Question 29Site Evaluation, Soils, and Drainage

What does a percolation test primarily determine for a proposed landscape or septic area?

  1. The depth to bedrock
  2. The soil's total nitrogen content
  3. Water infiltration rate Correct answer.
  4. The finished grade slope

Explanation

A percolation test measures how quickly water moves into and through the soil, which is important for drainage design and septic system siting. It does not measure nitrogen content, slope, or only bedrock depth.

Question 30Site Evaluation, Soils, and Drainage

What is a shallow, vegetated channel used to convey and slow stormwater called?

  1. A footing drain
  2. A swale Correct answer.
  3. A retaining wall
  4. A dry well

Explanation

A swale is a shallow channel, often vegetated, that conveys stormwater while slowing flow and promoting filtration or infiltration. Retaining walls, dry wells, and footing drains serve different drainage or structural functions.

Question 31Site Evaluation, Soils, and Drainage

What is the most direct effect of compacting soil during construction?

  1. Reduced infiltration Correct answer.
  2. Greater organic matter content
  3. Higher cation exchange capacity
  4. Increased total pore space

Explanation

Compaction presses soil particles closer together, reducing pore space and limiting the movement of air and water through the soil. This commonly lowers infiltration and can restrict root growth.

Question 32Site Evaluation, Soils, and Drainage

A proposed walkway rises 3 feet over a horizontal run of 20 feet. What is the slope in percent?

  1. 6%
  2. 3%
  3. 12%
  4. 15% Correct answer.

Explanation

Percent slope is calculated as rise divided by run, multiplied by 100. Here, 3 feet divided by 20 feet equals 0.15, or 15 percent.

Question 33Site Evaluation, Soils, and Drainage

Which soil textural class generally has the highest water-holding capacity?

  1. Gravelly sand
  2. Sandy loam
  3. Loamy sand
  4. Clay Correct answer.

Explanation

Clay has very small pores and a large surface area, so it can hold more water than coarser soils. However, its low permeability can also make drainage slow.

Question 34Site Evaluation, Soils, and Drainage

Cation exchange capacity (CEC) is generally highest in soils with which composition?

  1. High sand and low organic matter
  2. High gravel and low silt
  3. High silt and low clay
  4. High clay and organic matter Correct answer.

Explanation

CEC comes from negatively charged surfaces on clay minerals and humus, which retain positively charged nutrient ions. Soils high in both clay and organic matter therefore tend to have high CEC.

Question 35Site Evaluation, Soils, and Drainage

Which site condition most directly increases stormwater runoff volume from a landscape?

  1. Deep, well-aggregated topsoil
  2. A gentle, vegetated slope
  3. Dense vegetative cover
  4. Compacted, bare soil Correct answer.

Explanation

Compacted, bare soil has reduced infiltration and little vegetation to intercept rainfall, so more water becomes surface runoff. Well-aggregated soil and dense vegetation tend to increase infiltration and reduce runoff.

Question 36Site Evaluation, Soils, and Drainage

In a retaining wall, what is the purpose of weep holes and a gravel drainage layer behind the wall?

  1. To prevent frost heave in the footing only
  2. To supply irrigation water to plants
  3. To relieve hydrostatic pressure Correct answer.
  4. To increase the wall's dead load

Explanation

Water trapped in backfill creates hydrostatic pressure that can overturn or crack a retaining wall. Weep holes and gravel drainage allow that water to escape, reducing the pressure on the wall.

Question 37Site Evaluation, Soils, and Drainage

In site grading, what does a balanced cut-and-fill plan achieve?

  1. Runoff is directed to the street
  2. All topsoil is removed from the site
  3. The site is raised above the water table
  4. Cut volume equals fill volume Correct answer.

Explanation

A balanced cut-and-fill plan matches the amount of soil excavated with the amount needed for fills, minimizing import or export of soil. This reduces hauling costs and disturbance.

Question 38Site Evaluation, Soils, and Drainage

Why is a geotechnical soils report important before designing a footing for a landscape structure?

  1. It determines the color of the finish surface
  2. It calculates the number of plants needed
  3. It gives bearing capacity data Correct answer.
  4. It specifies the irrigation schedule

Explanation

A geotechnical report provides subsurface information such as soil strength, allowable bearing capacity, groundwater depth, and the presence of fill. These data are needed to size footings so they do not settle excessively.

Question 39Site Evaluation, Soils, and Drainage

What is the primary stormwater function of a bioswale?

  1. To store potable water for later use
  2. To raise the local water table
  3. To provide a structural foundation
  4. To slow and filter runoff Correct answer.

Explanation

A bioswale is a vegetated conveyance channel designed to reduce flow velocity and promote settling, filtration, and infiltration of stormwater. It is a treatment and conveyance practice, not a potable water storage or foundation system.

Question 40Site Evaluation, Soils, and Drainage

Which practice is most appropriate for stabilizing a steep, bare construction slope before vegetation establishes?

  1. Increasing irrigation frequency
  2. Applying a thick organic mulch only
  3. Removing all topsoil
  4. Using erosion control blankets Correct answer.

Explanation

Erosion control blankets or mats protect the soil surface from raindrop impact and sheet flow while newly seeded vegetation becomes established. On steep slopes, loose mulch alone can be displaced by runoff.

Question 41Site Evaluation, Soils, and Drainage

What is the best way to improve the structure of a heavy clay soil for planting?

  1. Incorporate organic matter Correct answer.
  2. Add coarse sand only
  3. Increase soluble salt content
  4. Compact it to improve bearing

Explanation

Organic matter helps bind clay particles into more stable aggregates, improving porosity, aeration, and drainage. Adding sand alone to clay can create a dense, concrete-like mixture rather than improving structure.

Question 42Site Evaluation, Soils, and Drainage

What is a primary benefit of applying organic mulch around landscape plants?

  1. It eliminates the need for drainage
  2. It conserves soil moisture Correct answer.
  3. It increases soil pH uniformly
  4. It increases soil bulk density

Explanation

Mulch shades the soil surface, reducing evaporation and helping maintain more even soil moisture and temperature. It also reduces crusting and erosion but does not replace drainage.

Question 43Site Evaluation, Soils, and Drainage

What is a perched water table?

  1. A water table that rises only during irrigation
  2. The depth at which soil is permanently dry
  3. A saturated zone above a restrictive layer Correct answer.
  4. The regional water table at bedrock

Explanation

A perched water table forms when a low-permeability layer, such as clay or hardpan, restricts downward water movement and creates a saturated zone above it. It is separate from the main regional water table.

Question 44Site Evaluation, Soils, and Drainage

According to Darcy's law, if the hydraulic gradient through a soil doubles while hydraulic conductivity remains constant, the flow rate will:

  1. Remain unchanged
  2. Quadruple
  3. Decrease by half
  4. Double Correct answer.

Explanation

Darcy's law states that flow rate is proportional to hydraulic conductivity, cross-sectional area, and hydraulic gradient. If the gradient doubles and other factors stay constant, the flow rate also doubles.

Question 45Site Evaluation, Soils, and Drainage

A sodic clay soil with poor structure and low infiltration is most likely to be improved by applying:

  1. Coarse gravel
  2. Fresh manure
  3. Sulfuric acid
  4. Gypsum Correct answer.

Explanation

Gypsum supplies calcium, which displaces sodium on clay exchange sites and promotes flocculation and improved structure. This is a standard treatment for sodic soils with poor infiltration.

Question 46Site Evaluation, Soils, and Drainage

What is the difference between stormwater detention and retention?

  1. Detention treats potable water; retention treats wastewater
  2. Detention stores water permanently; retention releases it slowly
  3. Detention applies to roofs; retention applies to streets
  4. Detention delays release; retention holds water Correct answer.

Explanation

Detention temporarily stores stormwater and releases it slowly after a storm. Retention holds water on site without direct surface release, often through infiltration or evaporation.

Question 47Site Evaluation, Soils, and Drainage

The average end area method is used in site work to estimate what?

  1. Soil pH changes after liming
  2. Irrigation application uniformity
  3. Slope stability factor of safety
  4. Earthwork volume Correct answer.

Explanation

The average end area method estimates earthwork volume by averaging the cross-sectional areas at two ends of a segment and multiplying by the distance between them. It is a volume calculation, not a chemical, irrigation, or stability analysis.

Question 48Site Evaluation, Soils, and Drainage

The angle of repose of a granular soil is most directly related to which property?

  1. Its organic matter content
  2. Its color
  3. Internal friction Correct answer.
  4. Its cation exchange capacity

Explanation

The angle of repose is the steepest slope at which a granular material remains stable, and it depends largely on internal friction and particle shape and size. Soils with greater interparticle friction generally stand at steeper angles.

Question 49Landscape Planning and Plant Selection

Sunset Western Garden Book climate zones differ from USDA hardiness zones mainly because Sunset zones:

  1. are based solely on latitude, elevation, and distance from the ocean
  2. rate plants only by water use, mature size, and growth rate
  3. factor in summer heat, rainfall, and coastal influence Correct answer.
  4. consider only the lowest winter temperature recorded at a site

Explanation

Sunset zones describe the climate of a western garden using winter minimum temperatures together with summer heat, rainfall pattern, ocean influence, and elevation. USDA zones use a single variable, average annual minimum winter temperature. Two sites with the same USDA zone can fall in different Sunset zones.

Question 50Landscape Planning and Plant Selection

WUCOLS evaluates California landscape plants primarily by which characteristic?

  1. water use relative to a reference turfgrass Correct answer.
  2. mature canopy spread and rooting depth
  3. cold hardiness within a Sunset climate zone
  4. tolerance of saline irrigation water

Explanation

WUCOLS assigns each listed plant to a very low, low, moderate, or high water-use category based on observed performance in California compared with a reference cool-season turf. The rating supports hydrozoning and water-budget calculations. It does not rate salt tolerance, cold hardiness, or mature size.