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Malersvendeprøven practice questions

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Question 1Assess and prepare a coating substrate

A painter must prepare newly cast concrete walls before skimming. What surface condition must be identified and removed before any primer or filler is applied?

  1. Carbonation layer (karbonatisering)
  2. Form-release oil residue and cement laitance (støbeskalslag / formsæberester) Correct answer.
  3. Micro-cracks measuring less than 0.1 mm
  4. Aggregate exposure from coarse sand

Explanation

Form release agents (formsæbe/formolie) and weak cement laitance (støbeskalslag/glimmerlag) on new concrete severely impair adhesion. They must be removed by degreasing, high-pressure washing, mechanical grinding, or light abrasive blast-cleaning before priming and skimming.

Question 2Assess and prepare a coating substrate

What is the key chemical and physical difference between ready-mixed dispersion filler (sandspartel / dispersionsspartel) and powder-based gypsum filler (gipsbaseret spartelmasse)?

  1. Dispersion filler dries solely by water evaporation accompanied by volume shrinkage, while gypsum filler hardens by chemical hydration with minimal shrinkage Correct answer.
  2. Gypsum filler cures exclusively by atmospheric carbonation, whereas dispersion filler cures by oxidation
  3. Dispersion filler hardens in any layer thickness without drying cracks, while gypsum filler is limited to 1 mm coats
  4. Gypsum filler is highly flexible and waterproof, whereas dispersion filler is rigid and water-soluble

Explanation

The stated ordinary dispersion filler mainly dries by evaporation, whereas the stated gypsum powder filler also hardens through hydration. Actual formulations, substrate, layer thickness and conditions affect shrinkage and readiness. Do not infer a universal zero-shrinkage or full-cure promise from the binder family.

Question 3Assess and prepare a coating substrate

For a gypsum-board jointing system that specifies paper reinforcement in tapered joints, which material should be embedded in the wet joint compound?

  1. Self-adhesive fiberglass mesh tape (selvklæbende glasfibernet)
  2. Creped masking tape (afdækningstape)
  3. Paper joint tape (papirarmeringsbånd) embedded into wet joint compound Correct answer.
  4. Polyester fleece cut into 200 mm strips

Explanation

Paper joint tape is embedded in the wet compound in systems designed around paper reinforcement and provides strong crack resistance when installed correctly. The candidate must follow the complete tested board-and-compound system; no tape can guarantee a crack-free joint if framing movement, board fixing, gaps, or drying are wrong.

Question 4Assess and prepare a coating substrate

A wall surface exhibits nicotine, dried soot, and localized water stains. What will occur if this substrate is coated directly with standard water-borne acrylic wall paint?

  1. The acrylic paint will dissolve the wall plaster and cause rapid spalling
  2. Water-soluble tar and stain components will bleed through (gennemslag) into the wet paint film and discolor the dried surface Correct answer.
  3. The paint will immediately flash-cure and form a glass-like brittle skin
  4. The stains will turn completely white and blend invisibly with the emulsion

Explanation

Nicotine, soot, and dried water rings contain water-soluble contaminants. Water-borne dispersion paints re-wet these substances, causing them to migrate into the liquid film (gennemslag) and reappear as yellowish-brown stains upon drying. A dedicated barrier/stain-blocking primer (spærregrund / isolérgrund) is required.

Question 5Assess and prepare a coating substrate

Which type of primer is technically designated to prevent bleed-through (gennemslag) of knot resins, nicotine, and dry water damage?

  1. Diluted clear acrylic mikrodispers
  2. Water-thinned potassium silicate primer (silikatgrunder)
  3. Isolating barrier primer (spærregrund / knast- og spærrelak) Correct answer.
  4. High-alkaline cement wash

Explanation

Spærregrund (barrier primer) is formulated with specialized blocking polymers (or cationic shellac/alkyd resins) that form a tight, impermeable film, preventing water- and solvent-soluble tannins, nicotine, and resins from bleeding into topcoats.

Question 6Assess and prepare a coating substrate

A painter must skim-coat a room with a total wall surface area of 84 m² to quality class K4 using a lightweight roller-applied skim filler (rullespartel). The manufacturer specifies a coverage of 1.2 liters per m² for a 1 mm continuous layer. How many liters of rullespartel are required?

  1. 70.0 liters
  2. 100.8 liters Correct answer.
  3. 120.5 liters
  4. 84.0 liters

Explanation

Calculate material consumption: Volume = Area × Application Rate = 84 m² × 1.2 L/m² = 100.8 liters of filler.

Question 7Assess and prepare a coating substrate

What is the primary technical function of basic cleaning with alkaline wash (grundrens / malerafvaskning) on previously painted surfaces prior to repainting?

  1. To chemically etch deep grooves into the substrate to replace mechanical sanding
  2. To remove grease, soot, wax, and grime so the new coating can wet and adhere to the old substrate Correct answer.
  3. To completely dissolve the existing paint binder down to bare masonry
  4. To neutralize any acidic pigments and bleach the old color

Explanation

Grundrens is an alkaline cleaner that saponifies fats, removes atmospheric grease, grime, and fingerprints. Removing these boundary layer contaminants ensures proper wetting and adhesion of subsequent primers or topcoats.

Question 8Assess and prepare a coating substrate

Which tool is standard in Denmark for applying and smoothing wide continuous skim-coats (bredspartling / rullespartling) on large drywall areas?

  1. A 50 mm oval sash brush (ovalpensel)
  2. A flexible broad-knife / smoothing spatula (bredspartel / spartelspade) with a 400 mm to 600 mm stainless blade Correct answer.
  3. A serrated notched tile trowel (tandspartel)
  4. A sheepskin floor mop

Explanation

Skim-coating large surfaces is performed using broad smoothing spatulas (bredspartel) or ergo-blade smoothing knives typically 400 mm to 600 mm in width, allowing the painter to level compound flat across joints and board faces without hollows or ridges.

Question 9Assess and prepare a coating substrate

When inspecting external drywall corners (udvendige hjørner) subject to physical impacts in a corridor, what reinforcement should be installed before skimming?

  1. Rigid corner profile (hjørneprofil / metal- eller plastforstærket hjørnebånd) bedded in filler Correct answer.
  2. Standard crepe masking tape
  3. Single layer of 50 g/m² glass tissue
  4. Clear silicone sealant bead

Explanation

External corners require physical impact resistance. Install metal or composite corner beads (forstærkede hjørneprofiler, such as paper-faced steel or PVC beads) set in filler to protect the vulnerable gypsum core from chipping.

Question 10Assess and prepare a coating substrate

Why is it critical to inspect the depth of drywall screw heads (skruehuller) before starting K2 joint finishing?

  1. Screws must project 2 mm above the paper surface so filler can grip their ridges
  2. Screws must be countersunk below the paper surface without rupturing the paper liner; protruding screws snag the broad knife, and torn paper weakens holding strength Correct answer.
  3. Screws should be completely driven through the board until the head hits the timber stud
  4. Screw heads must be countersunk at least 10 mm deep into the gypsum core

Explanation

Drywall screws must be dimpled slightly beneath the surface (approx. 0.5–1 mm) without breaking through the paper face. Protruding heads hit the broad-knife blade and prevent flush filling, while over-driven screws punch through the paper liner, destroying structural holding capacity.

Question 11Assess and prepare a coating substrate

After complete sanding of a skimmed wall, what critical preparation step must be completed before applying primer or wallpaper adhesive?

  1. Vacuuming or dusting off all fine sanding dust (afstøvning) Correct answer.
  2. Soaking the wall with kerosene to highlight imperfections
  3. Washing the dry compound with high-pressure water
  4. Applying two heavy coats of beeswax polish

Explanation

Sanding drywall filler leaves microscopic dust particles settled across the surface. If not removed by thorough vacuuming or microfiber dusting (afstøvning), the primer or adhesive binds to the loose dust layer rather than the wall, causing adhesive failure and peeling.

Question 12Assess and prepare a coating substrate

A painter must patch wet-room drywall outside the direct splash zone. Which filler choice is the sound starting point?

  1. Standard interior lightweight gypsum joint filler (almindelig gipsbaseret indendørsspartel)
  2. Moisture-resistant wet-room filler (vådrumspartel) formulated with water-resistant dispersion binders Correct answer.
  3. Interior cellulose paste mixed with powdered chalk
  4. Unmodified decorating distemper paste

Explanation

Use a moisture-resistant filler that is explicitly compatible with the board, primer, membrane or coating, exposure zone, and complete approved wet-room system. The label 'outside the direct splash zone' does not make ordinary filler automatically acceptable, and product-system instructions control the repair sequence.

Question 13Coating chemistry, film formation and application evidence

What is the primary binder chemistry used in modern interior water-borne wall paints (plastmaling / dispersionsmaling)?

  1. Pure linseed oil (linolie)
  2. Synthetic polymer dispersion (acrylic, vinyl-versatate, or styrene-acrylic copolymers) Correct answer.
  3. Nitrocellulose resin dissolved in ketones
  4. Coal tar pitch emulsified in water

Explanation

Modern architectural wall paints are based on synthetic polymer dispersions-predominantly 100% acrylic or vinyl-acetate/ethylene copolymers dispersed as microscopic polymer droplets in water. When water evaporates, the polymer particles coalesce into a continuous film.

Question 14Coating chemistry, film formation and application evidence

How does an alkyd enamel paint (alkydmaling) cure after application?

  1. Solely by rapid water evaporation in under 15 minutes
  2. By physical evaporation of solvent followed by chemical auto-oxidation (cross-linking with atmospheric oxygen) Correct answer.
  3. By endothermic reaction with carbon dioxide forming calcium carbonate
  4. By high-temperature baking at 180°C

Explanation

Alkyds are oil-modified polyester resins. Initial physical drying occurs as organic solvents (or water in emulsified alkyds) evaporate, followed by chemical curing where unsaturated fatty acid chains react with atmospheric oxygen (oxidativ hærdning) to create a cross-linked polymer network.

Question 15Coating chemistry, film formation and application evidence

What is the scientific definition of Pigment Volume Concentration (PVC) in paint technology?

  1. The weight percentage of dry pigment relative to the liquid solvent
  2. The volume ratio of pigments and extenders relative to the total volume of dry solids (pigments + non-volatile binder) Correct answer.
  3. The optical opacity of paint measured on a black-and-white contrast card
  4. The total volume of wet paint contained within an unopened packaging can

Explanation

Pigment Volume Concentration is calculated as: PVC (%) = [Volume of Pigments + Extenders] ÷ [Volume of Pigments + Extenders + Volume of Solid Binder] × 100. It determines whether the paint film has excess binder or exposed porous pigment particles.

Question 16Coating chemistry, film formation and application evidence

What happens to the physical properties of a dried paint film when its formulation exceeds the Critical Pigment Volume Concentration (CPVC)?

  1. The film becomes high-gloss, ultra-flexible, and completely impervious to water vapor
  2. There is insufficient binder to completely encapsulate the pigment particles, resulting in micro-porosity, high matte appearance, lower washability, and reduced scrub resistance Correct answer.
  3. The paint becomes rubbery and impossible to sand
  4. The curing speed increases ten-fold and cures underwater

Explanation

At the CPVC, binder volume exactly fills the void spaces between packed pigment and extender grains. Above CPVC (as in dead-flat ceiling paints with gloss 2-3), voids appear between pigment particles, creating a porous film with high diffuse light scattering (ultra-matte), lower mechanical washability, and high vapor permeability.

Question 17Coating chemistry, film formation and application evidence

A painter needs to apply two coats of wall paint to a total wall area of 160 m². The technical data sheet states a spreading rate (rækkeevne) of 8 m² per liter per coat. How many liters of paint must be purchased, ignoring rounding?

  1. 10 liters
  2. 20 liters
  3. 40 liters Correct answer.
  4. 80 liters

Explanation

Calculate total paint consumption: Liters Needed = (Total Area × Number of Coats) ÷ Spreading Rate = (160 m² × 2 coats) ÷ 8 m²/L = 320 ÷ 8 = 40 liters.

Question 18Coating chemistry, film formation and application evidence

A painter has an apartment with 225 m² of wall area requiring 2 coats of emulsion paint with a spreading rate of 9 m²/L. Factoring in an estimated 10% application and cutting-in waste, how many 10-liter buckets of paint must be ordered?

  1. 4 buckets
  2. 5 buckets
  3. 6 buckets Correct answer.
  4. 8 buckets

Explanation

Net volume = (225 m² × 2 coats) ÷ 9 m²/L = 50.0 liters. Adding 10% waste: 50.0 × 1.10 = 55.0 liters. Since paint is sold in 10-liter buckets, 5 buckets (50 L) is insufficient, so exactly 6 buckets (60 L) must be ordered.

Question 19Coating chemistry, film formation and application evidence

What is the primary cause of 'lap marks' (rullegader / overlapninger) when rolling large walls with water-borne dispersion paint?

  1. Using a roller sleeve with nap that is too long
  2. Failing to maintain a continuous wet edge (våd kant), causing the roller to overlap partially dried paint Correct answer.
  3. Applying paint when ambient humidity is above 90%
  4. Stirring the paint too thoroughly before pouring it into the tray

Explanation

Lap marks appear when the edge of a freshly applied paint section dries before the adjacent strip is rolled into it. Rolling over a semi-dry edge deposits double film thickness and disrupts pigment orientation, leaving visible dark or shiny banding under natural light.

Question 20Coating chemistry, film formation and application evidence

What paint film defect is characterized by tiny crater-like circular depressions with a raised rim and a central dot, typically caused by silicone or oil contamination on the substrate?

  1. Alligatoring (krokodilleskind)
  2. Fisheyes (fiskeøjne / kratere) Correct answer.
  3. Chalking (kridtning)
  4. Saponification (forsæbning)

Explanation

Fisheyes (fiskeøjne) are circular depressions or craters caused by localized surface tension differentials. Airborne silicone lubricants, oil mist, or wax on the substrate prevent the liquid paint from wetting the surface, pulling the film back into a crater around the contamination point.

Question 21Coating chemistry, film formation and application evidence

What defect occurs when a thick coat of alkyd enamel is applied in direct sunlight or forced-dried with high heat, curing the outer surface while the underlying layer remains wet?

  1. Wrinkling (rynkedannelse / krakelering) Correct answer.
  2. Efflorescence (saltudslag)
  3. Blushing (hvidsløring)
  4. Flash rusting (lynrust)

Explanation

Wrinkling (rynkedannelse) happens in oxidative alkyd paints when the surface cures rapidly and expands while the body of the film remains soft. As the surface skin expands over the liquid underlayer, it buckles into fine ripples and wrinkles.

Question 22Coating chemistry, film formation and application evidence

Why does linseed oil (linolie) soaked in cotton wiping rags pose an acute fire risk on painting job sites?

  1. Linseed oil evaporates into heavier-than-air explosive gases at room temperature
  2. Linseed oil cures by an exothermic oxidative reaction; when trapped inside crumpled rags, heat cannot dissipate, leading to spontaneous combustion (selvantændelse) Correct answer.
  3. Linseed oil reacts with atmospheric nitrogen to create nitroglycerin
  4. Linseed oil attracts static electricity from nylon overalls

Explanation

Linseed oil cures by auto-oxidation, which is an exothermic chemical process. In crumpled rags, the vast surface area and insulating folds trap the generated heat, raising the temperature until it reaches the auto-ignition point of the cotton rag (selvantændelse). Rags must be stored in airtight metal cans or submerged in water.

Question 23Coating chemistry, film formation and application evidence

A paint specification requires a dry film thickness (DFT / tørfilmtykkelse) of 40 microns (µm). The paint has a volume solids content (tørstofindhold i volumen) of 50%. What wet film thickness (WFT / vådfilmtykkelse) must the painter apply?

  1. 20 µm
  2. 40 µm
  3. 80 µm Correct answer.
  4. 120 µm

Explanation

Calculate wet film thickness: WFT = DFT ÷ Volume Solids = 40 µm ÷ 0.50 = 80 µm. As the 50% volatile components evaporate, the 80 µm wet layer shrinks down to exactly 40 µm dry film.

Question 24Coating chemistry, film formation and application evidence

Which measuring tool is used on the construction site to check wet film thickness (WFT) immediately after roller or spray application?

  1. An electronic ultrasonic dry-film probe
  2. A comb gauge (vådfilmskam / kamformet tykkelsesmåler) Correct answer.
  3. A steel measuring tape
  4. A pendulum hardness tester

Explanation

A wet film comb gauge (vådfilmskam) features stepped teeth of calibrated depths. The painter presses the gauge firmly into the freshly applied coating perpendicular to the substrate; the WFT lies between the last wetted tooth and the first dry tooth.

Question 25Coating chemistry, film formation and application evidence

What is the primary technical function of titanium dioxide (titandioxid / TiO2) in architectural white paints?

  1. It serves as a biocidal preservative against dry rot
  2. It provides superior opacity, brightness, and hiding power (dækkeevne) due to its exceptionally high refractive index Correct answer.
  3. It acts as a chemical drying agent that accelerates alkyd curing
  4. It lowers paint viscosity so paint can be applied without thinning

Explanation

Titanium dioxide (rutile form) has an extraordinarily high refractive index (~2.7), which strongly scatters visible light. It is the primary white prime pigment used worldwide to provide high hiding power and whiteness in architectural coatings.

Question 26Coating chemistry, film formation and application evidence

What role do extender pigments (fyldstoffer), such as calcium carbonate (calciumcarbonat / kridt) and talc, play in interior paint formulations?

  1. They provide all the primary tinting color in vibrant yellows and reds
  2. They adjust gloss levels, increase solids volume, improve sanding properties, and control rheology at economical cost Correct answer.
  3. They replace water as the primary volatile solvent
  4. They chemically react with atmospheric ozone to sterilize room air

Explanation

Extenders (fyldstoffer) have refractive indices close to paint binders (~1.5–1.6), so they offer minimal dry hiding power alone, but they are essential for regulating sheen (matting), controlling viscosity, preventing pigment settlement, improving sandability, and optimizing packing density.

Question 27Coating chemistry, film formation and application evidence

What is meant by the 'open time' (åbentid) of an interior paint?

  1. The duration an unopened paint can may remain on a warehouse shelf before expiring
  2. The period during which the freshly applied paint film remains workable and fluid enough to brush or roll into without leaving visible lap marks or brush drag Correct answer.
  3. The total time needed for the paint to achieve full chemical cross-linking and scrub resistance (typically 28 days)
  4. The time a room's windows must stay open after painting

Explanation

Open time (åbentid) is the operational window during which wet paint can be touched up, spread, or overlapped with a wet edge without tearing the partially coalesced polymer skin. Formulations with longer open times reduce lap marks on large walls and ceilings.

Question 28Coating chemistry, film formation and application evidence

When painting fine interior woodwork (e.g., doors, windows, casings) with acrylic-alkyd enamel, what brush type is technically preferred?

  1. A stiff natural hog-bristle brush (svinebørster)
  2. A synthetic filament brush with split/flagged tips (syntetiske fibre / spaltede spidser) Correct answer.
  3. A steel wire brush
  4. A round masonry liming brush

Explanation

Water-borne paints cause natural hog bristles to absorb water, swelling, becoming limp, and losing their shape. Specially engineered synthetic filament brushes (polyester/nylon blends with flagged, tapered tips) do not absorb water, maintaining crisp edge control and smooth flow without tramlines.

Question 29Coating chemistry, film formation and application evidence

What is the primary cause of 'saponification' (forsæbning) when an alkyd or oil-based paint is applied to fresh concrete or mortar?

  1. The alkaline calcium hydroxide (Ca(OH)2) in moist fresh concrete chemically hydrolyzes the ester linkages in the vegetable oil/alkyd resin, forming water-soluble soap and soft, sticky film failure Correct answer.
  2. The concrete releases acidic fumes that polymerize the solvent into rubber
  3. The concrete absorbs all pigment particles leaving clear oil on the surface
  4. Carbon dioxide in the concrete oxidizes the paint pigments into white chalk

Explanation

Fresh concrete contains uncarbonated calcium hydroxide with a high pH (>12–13). When an ester-containing binder (alkyd, linseed oil) comes into contact with this alkaline moisture, the ester bonds are cleaved in a saponification reaction, producing soap and glycerol, causing the coating to turn into a sticky, gummy mess that permanently fails to dry.

Question 30Wallcoverings, color approval and decorative systems

What is the primary technical difference between woven glass fabric (glasvæv) and non-woven smooth glass fleece (glasfilt)?

  1. Glasvæv is woven with distinct textured patterns (e.g., herringbone, fine twill) providing high impact resistance, while glasfilt consists of randomly distributed, non-woven glass microfibers forming an ultra-smooth, uniform surface Correct answer.
  2. Glasfilt can only be installed using hot bitumen, whereas glasvæv uses wheat paste
  3. Glasvæv is made of paper pulp, while glasfilt is made of spun polyester
  4. Glasfilt requires heavy sanding after installation, while glasvæv is unpaintable

Explanation

Glasvæv features a discernible woven mechanical texture (herringbone, diamond, or plain weave) that reinforces walls and hides small imperfections, whereas glasfilt (non-woven glass fleece) consists of unoriented glass filaments compressed into a flat sheet, creating a seamless, flat finish resembling smooth plaster when painted.

Question 31Wallcoverings, color approval and decorative systems

What is the purpose of using pre-primed glass fleece (forgrundet filt) instead of raw unprimed fleece (ugrundet filt)?

  1. Pre-primed fleece is 100% waterproof and eliminates the need for any topcoats
  2. Pre-primed fleece has a factory-applied coating that reduces porosity and helps equalize the surface, potentially reducing site-applied coating work Correct answer.
  3. Pre-primed fleece is self-adhesive and requires no wall glue
  4. Pre-primed fleece allows the apprentice to skip joint filling on the drywall

Explanation

Factory-primed fleece has a more uniform, less porous face than raw fleece and can reduce strike-through and site-applied coating work. It does not guarantee that a particular coat can be omitted: the covering and paint manufacturers' system, color, opacity, finish, and specification determine the required coats.

Question 32Wallcoverings, color approval and decorative systems

Which adhesive is normally selected for a heavy glass wallcovering when its technical data sheet calls for a water-borne dispersion wallcovering adhesive?

  1. Pure methylcellulose wallpaper paste (ren metylcellulose tapetklister)
  2. Polyvinyl acetate (PVA) dispersion wall adhesive (vævlim / dispersionslim) Correct answer.
  3. Contact cement thinned with acetone
  4. Polyurethane construction foam

Explanation

A compatible dispersion wallcovering adhesive (vævlim) provides the wet tack, open time, and dry bond needed by many heavy glass coverings. Exact binder chemistry is product-specific; the covering manufacturer, substrate, exposure, and system data sheet determine the approved adhesive rather than a universal requirement for pure PVA.

Question 33Wallcoverings, color approval and decorative systems

For a specified paste-the-wall glass-fleece system, which listed application approach follows its instruction to apply a uniform adhesive layer over the next manageable drops?

  1. Brush paste exclusively onto the back of the fleece, fold it in booked strips, and wait 30 minutes
  2. Roll adhesive directly onto the wall surface in a generous, uniform layer for 1–2 drops at a time using a medium-pile paint roller Correct answer.
  3. Dip the roll of fleece into a water trough and squeeze out the excess
  4. Spray liquid cyanoacrylate adhesive onto the ceiling only

Explanation

Wall fleece is installed by the 'paste-the-wall' method (rulles på væggen). Vævlim is rolled generously and uniformly onto the wall substrate for 1 to 2 drop widths at a time. The dry fleece is then positioned into the wet adhesive bed and smoothed flat.

Question 34Wallcoverings, color approval and decorative systems

When smoothing hung glass fleece or wallpaper to expel trapped air and ensure complete adhesive contact, which tool should be used?

  1. A flexible plastic wallpaper smoothing blade / spatula (tapetspatel) or smoothing roller Correct answer.
  2. A wire scrubbing brush
  3. A steel claw hammer
  4. A heated flatiron set to 200°C

Explanation

A plastic wallpaper spatula (tapetspatel) or rubber pressure roller is used to sweep from the center outward toward the edges, pressing the fleece firmly into the wet adhesive and pushing out air bubbles without scratching or stretching the material.

Question 35Wallcoverings, color approval and decorative systems

A painter must calculate wallpaper rolls for a room with an unbroken wall perimeter of 16.0 meters and a net ceiling height of 2.50 meters. The wallpaper rolls are standard European dimensions: 0.53 m wide and 10.05 m long, with zero pattern repeat (straight match / fri matching). Adding 10 cm trim allowance per drop, how many rolls are required?

  1. 8 rolls
  2. 11 rolls Correct answer.
  3. 14 rolls
  4. 18 rolls

Explanation

Calculate drops needed: 16.0 m perimeter ÷ 0.53 m roll width = 30.19 → 31 drops. Cut length per drop: 2.50 m + 0.10 m trim = 2.60 m. Drops per roll: floor(10.05 m ÷ 2.60 m) = 3 drops per roll (with 2.25 m leftover waste per roll). Total rolls needed: ceil(31 drops ÷ 3 drops/roll) = ceil(10.33) = 11 rolls.

Question 36Wallcoverings, color approval and decorative systems

What is the meaning of the wallpaper symbol showing two arrows pointing at each other at the same horizontal level (-> <-)?

  1. Reverse hang (omvendt opsætning): every alternate drop must be hung upside down
  2. Straight match (lige overensstemmelse): pattern motifs align horizontally across adjacent drops at identical height Correct answer.
  3. Drop match (forskudt rapport): the pattern shifts vertically by half a repeat on each consecutive strip
  4. Free match (ingen mønstertilpasning): no pattern alignment required

Explanation

Two horizontal arrows pointing directly at each other denote a straight match (lige overensstemmelse). The design elements on the right edge of one strip align horizontally with identical elements on the left edge of the next strip at the same height.

Question 37Wallcoverings, color approval and decorative systems

What is the primary cause of open seam shrinkage (åbne samlinger) after hanging traditional paper-backed wallpaper?

  1. Insufficient soaking time (trækketid / blødtid), causing the paper to expand on the wall as it absorbs moisture from paste, followed by shrinkage as it dries Correct answer.
  2. Applying paste at a temperature above 35°C
  3. Using a sharp trimming knife
  4. Hanging wallpaper under 100% relative humidity

Explanation

Cellulose paper fibers expand when wet. If paper wallpaper is hung before it has soaked and expanded fully during its required booking time (blødtid), it continues to stretch on the wall and then contracts forcefully as it dries, pulling the seams apart and leaving exposed substrate gaps.

Question 38Wallcoverings, color approval and decorative systems

Why is it critical to establish a true vertical plumb line (lodlinje) using a spirit level or plumb bob before hanging the first wallpaper drop on a wall?

  1. To ensure the wallpaper adhesive dries 50% faster
  2. Because room corners and door frames are rarely plumb; hanging the first strip plumb prevents cumulative slanting and crooked patterns across the entire room Correct answer.
  3. Danish law requires all wallpaper drops to tilt at a 2-degree angle toward windows
  4. To calibrate the digital moisture meter

Explanation

Structural walls and corners are seldom plumb. Aligning the first drop against an out-of-plumb corner causes every subsequent drop to lean progressively, creating slanted pattern lines and misaligned trim at the ceiling. Establishing a true vertical plumb line guarantees square installation.

Question 39Wallcoverings, color approval and decorative systems

What is the purpose of hanging lining paper (makulatur) before applying luxury decorative wallpaper?

  1. To provide an impermeable acoustic barrier that stops sound transmission
  2. To equalize substrate porosity, bridge minor hairline imperfections, provide a consistent white background, and absorb drying stresses to prevent seam opening Correct answer.
  3. To act as a vapor barrier on exterior walls
  4. To make the wall magnetic

Explanation

Lining paper (makulatur) provides a uniform, stable, absorbency-balanced ground for fine decorative wallpapers. It buffers moisture exchange during pasting and absorbs lateral contraction forces as high-end wallpapers dry, preventing open seams.

Question 40Wallcoverings, color approval and decorative systems

In the Natural Colour System (NCS), what do the four elementary chromatic colors (elementærfarver) represent?

  1. Cyan, Magenta, Yellow, and Black (CMYK)
  2. Yellow (Y), Red (R), Blue (B), and Green (G) Correct answer.
  3. Red, Green, and Blue (RGB)
  4. Orange, Violet, Teal, and Lime

Explanation

NCS is based on human visual perception (hering opponent-color theory) and defines six elementary color sensations: two non-chromatic (White 'W' and Black 'S') and four unique chromatic hues: Yellow (Gult 'Y'), Red (Rødt 'R'), Blue (Blåt 'B'), and Green (Grønt 'G').

Question 41Wallcoverings, color approval and decorative systems

For the NCS color code 'S 2030-B10G', what is the visual whiteness percentage (hvidhed 'w') of this color?

  1. 20%
  2. 30%
  3. 50% Correct answer.
  4. 80%

Explanation

In the NCS color triangle, the visual sum of blackness (s), chromaticness (c), and whiteness (w) always equals 100%: s + c + w = 100. Here, s = 20% and c = 30%. Therefore: w = 100 - (20 + 30) = 100 - 50 = 50% whiteness.

Question 42Wallcoverings, color approval and decorative systems

What is the phenomenon of 'metamerism' (metameri) in architectural painting?

  1. Two color samples appear identical under one light source (e.g., standard daylight D65) but visually differ when viewed under a different light source (e.g., incandescent warm light 2700K or LED) Correct answer.
  2. Paint changing color permanently when exposed to damp air
  3. The rapid fading of neon pigments when exposed to direct sunlight
  4. The separation of water and oil inside a sealed paint can

Explanation

Metamerism occurs when two painted surfaces formulated with different pigment combinations have different spectral reflectance curves that happen to stimulate the eye identically under one specific illuminant, but visibly diverge under other light sources with different spectral power distributions.

Question 43Wallcoverings, color approval and decorative systems

Which pair of hues represents a true complementary color harmony (komplementærfarver) on the traditional artist's color circle?

  1. Red and Green Correct answer.
  2. Yellow and Orange
  3. Blue and Black
  4. Green and Brown

Explanation

Complementary colors sit directly opposite each other on the color wheel: Red and Green, Blue and Orange, Yellow and Purple. When placed adjacent to each other, they maximize chromatic contrast and visual vibrancy; when mixed together subtractively, they neutralize into gray/brown.

Question 44Wallcoverings, color approval and decorative systems

What is the definition and visual characteristic of a 'glaze' (lasur / lasurmaling) in decorative painting?

  1. A completely opaque, high-build textured plaster designed to level rough masonry
  2. A semi-transparent or translucent colored coating formulated with low pigment concentration in a clear binder, allowing underlying coats, textures, or wood grain to shimmer through Correct answer.
  3. A black bituminous roof coating
  4. A chemical acid etch that bleaches wood white

Explanation

Lasur is a translucent or semi-transparent finish. Because it has high binder content and low pigment volume, incoming light penetrates through the glaze film and reflects off the underlying basecoat, creating depth, optical luminosity, and visual richness.

Question 45Wallcoverings, color approval and decorative systems

Which specialty brush is traditionally used by decorative painters to soften, blend, and eliminate brushmarks in wet glaze (lasur), wood graining, and marbling?

  1. A badger-hair blending brush / softener (fordriver / grævlingehaarsfordriver) Correct answer.
  2. A triangular wire scratch brush
  3. A steel-bristled floor broom
  4. A stiff radiator brush with bent handle

Explanation

A fordriver (badger-hair softener or soft blender) has extremely fine, flexible, bushy hair tips. Held lightly and whisked across wet glaze with quick butterfly strokes, it effortlessly blends glaze tones, diffuses harsh lines, and removes brush striae without picking up material.

Question 46Wallcoverings, color approval and decorative systems

When painting sharp, crisp color-separation lines between two intense wall colors using masking tape (afdækningstape), what professional technique prevents paint from bleeding (underløb) under the tape edge?

  1. Apply the tape and immediately spray water along the edge
  2. Apply tape, seal the edge by painting over it with the existing basecoat color (or clear acrylic medium) and allow it to dry before applying the contrasting color Correct answer.
  3. Heat the masking tape with a 500°C blowtorch to melt the adhesive to the plaster
  4. Double the thickness of tape by applying four layers on top of each other

Explanation

To guarantee razor-sharp lines (knivskarpe kanter), the painter applies the tape, firmly burns the edge down, and paints the tape margin with the underlying basecoat color. Any minor micro-gaps under the tape absorb the base color. Once dry, the contrasting color is applied with zero bleed-under.

Question 47Wallcoverings, color approval and decorative systems

In traditional decorative wood graining (ådring af træværk), which tool is used to simulate the pores, medullary rays, and pores in oak (egetræ)?

  1. A steel graining comb (stålkam / ådrekam) and a flogger brush (slåbørste / slagbørste) Correct answer.
  2. A handheld angle grinder with diamond disc
  3. A high-pressure water washer
  4. A hot soldering iron

Explanation

In classic oak graining, the painter applies a tinted translucent glaze (ølfarve or oil scumble) over an ochre basecoat, drags steel or rubber combs (ådrekamme) to create pore lines and medullary rays (spejle), and uses a long-bristled flogger brush (slåbørste) to tap the wet glaze, creating authentic wood pore striae.

Question 48Wallcoverings, color approval and decorative systems

When creating a faux marble finish (marmorering, e.g., Carrara or Vert Antique), how are natural marble veins (marmorårer) realistically rendered?

  1. By masking straight rectangular grids with 50 mm packaging tape
  2. By drawing organic, meandering diagonal veins using a soft goose-quill feather or fine artist's liner brush into wet scumble glaze, followed immediately by gentle badger-hair softening (fordrivning) Correct answer.
  3. By splatter-spraying black automotive underbody coating from 2 meters away
  4. By pressing corrugated cardboard against wet gloss enamel

Explanation

Authentic faux marbling requires soft, organic geological flow. The artisan uses a natural feather (gåsefjer) or script liner to trace branching vein networks through wet translucent glaze, then immediately diffuses and embeds the veins into the ground using a badger-hair softening brush (fordriver).

Question 49Wallcoverings, color approval and decorative systems

When a project accessibility specification calls for clear visual contrast at doors and operating controls, which color-selection approach best supports users with impaired vision?

  1. 0% contrast (identical color and lightness)
  2. Select finishes with a measurable luminance difference meeting the project's documented accessibility criterion Correct answer.
  3. 100% pure specular mirror reflection
  4. Contrast is not addressed in Danish building standards

Explanation

Useful contrast is based primarily on luminance/lightness difference, not hue names or gloss alone. The painter should work from the project's documented accessibility criterion and measured product values. This avoids presenting a single numerical threshold as a universal BR18 paint rule when building type, guidance, and the specified calculation method may differ.

Question 50Wallcoverings, color approval and decorative systems

In the NCS color system, two colors with notations 'S 1040-Y20R' and 'S 4040-Y20R' have which relationship in common?

  1. They have identical blackness and different hues
  2. They have identical hue (Y20R) and identical chromaticness (40), but different blackness (10% vs. 40%) Correct answer.
  3. They are exact complementary opposites on the color circle
  4. They have identical whiteness values

Explanation

Both notations share the identical hue 'Y20R' (Yellow with 20% Red) and the same chromaticness value '40' (c = 40%). They differ in blackness (s = 10% vs. 40%), meaning the second color is a darker shade of the same clean hue nuance.