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Question 1. Which gypsum board thickness is most commonly used for standard residential interior walls? A) 1/4" B) 3/8" C) 1/2" D) 5/8" Answer: C Explanation: A 1/2-inch board provides adequate strength for typical 16-inch stud spacing while being easy to handle and finish.
Question 2. **Type X gypsum board is required primarily for which of the following? ** A) Moisture-resistant applications in bathrooms B) High-impact areas such as gymnasiums C) Fire-rated assemblies in walls and ceilings D) Acoustic insulation in theaters Answer: C Explanation: Type X contains glass fibers that give it a 1-hour fire-rating, making it mandatory in fire-resistant construction.
Question 3. What is the main advantage of greenboard over standard gypsum board? A) Higher impact resistance B) Improved fire rating C) Moisture resistance for damp locations D) Reduced weight for high-rise construction
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Answer: C Explanation: Greenboard is moisture-resistant, allowing use in areas with occasional dampness such as basements.
Question 4. Purple (glass-mat) gypsum board is best suited for which environment? A) Exterior sheathing B) High-temperature industrial spaces C) Areas prone to mold growth, like showers D) Sound-proof partitions Answer: C Explanation: The glass-mat facing resists mold, making it ideal for wet areas where mold is a concern.
Question 5. Which of the following board types provides a built-in vapor barrier? A) Standard 1/2" wallboard B) Foil-backed gypsum board C) Type C fire-rated board D) Moisture-resistant greenboard Answer: B Explanation: Foil-backed board has a metal layer that acts as a vapor retarder, limiting moisture migration.
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Answer: B Explanation: “Hot mud” refers to setting-type compound that hardens through a chemical reaction, often used for fast set or deep fills.
Question 9. Paper tape is preferred over fiberglass mesh for which reason? A) It is more flexible in tight corners B) It provides stronger joint reinforcement when embedded in compound C) It resists mold growth better than mesh D) It requires fewer coating passes Answer: B Explanation: Paper tape’s fibers bond tightly with joint compound, creating a stronger, crack-resistant joint.
Question 10. Which corner bead is most appropriate for high-impact commercial corridors? A) Vinyl-covered metal bead B) Paper-faced composite bead C) Standard metal bead with a smooth finish D) Plastic bead with built-in reinforcement Answer: D Explanation: Plastic beads with reinforcement absorb impacts better than thin metal or paper-faced options.
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Question 11. The primary purpose of a J-bead trim piece is to: A) Provide a decorative edge on exposed ceilings B) Seal the gap between drywall and a floor slab or concrete wall C) Reinforce corners in high-traffic areas D) Allow movement between adjoining wall surfaces Answer: B Explanation: J-beads create a clean, finished transition where drywall meets a floor or slab, preventing cracks.
Question 12. When verifying stud spacing for 5/8" drywall, the minimum acceptable spacing is: A) 12 inches o.c. B) 16 inches o.c. C) 24 inches o.c. D) 30 inches o.c. Answer: B Explanation: 5/8" board can span 24" on metal studs but for wood framing the recommended maximum is 16" to avoid sag.
Question 13. A “proud” stud is defined as a stud that: A) Is bowed outward from the plane of the wall B) Extends beyond the finished surface of the installed drywall C) Is twisted, causing uneven screw penetration D) Has a larger cross-section than adjacent studs Answer: B
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B) It reduces the risk of mold growth on wet surfaces C) It eliminates the need for a vapor barrier D) It speeds up the chemical cure of setting-type mud Answer: B Explanation: Good airflow removes moisture, inhibiting mold formation on still-wet joint areas.
Question 17. When coordinating with insulation installers, the drywall crew must ensure that: A) The insulation is left exposed for aesthetic purposes B) Vapor barriers are not punctured during drywall attachment C) Insulation is installed after all drywall taping is complete D) All insulation is removed before applying texture finishes Answer: B Explanation: Penetrating a vapor barrier can compromise moisture control, so drywall fasteners must be placed to keep it intact.
Question 18. In a vertical drywall installation, the primary advantage is: A) Reduced number of butt joints on the ceiling B) Faster installation due to fewer cuts C) Better resistance to sagging on long spans D) Easier alignment with floor joists Answer: A Explanation: Installing boards vertically on walls reduces the number of horizontal butt joints, which are more visible on ceilings.
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Question 19. The maximum allowable gap between two drywall sheets at a butt joint is: A) 1/8 inch B) 1/4 inch C) 1/2 inch D) No gap; edges must be flush Answer: B Explanation: A 1/4-inch gap allows for taper overlap and compensates for board expansion without creating a weak joint.
Question 20. In a field-fastening schedule, how many screws should be placed per linear foot on a 1/2" board attached to wood studs? A) 2 screws per foot B) 4 screws per foot C) 6 screws per foot D) 8 screws per foot Answer: B Explanation: The standard field pattern is one screw every 8 inches (≈4 per foot) to provide adequate support without over-driving.
Question 21. What is the recommended screw head depth to avoid “paper shiner” defects? A) Fully countersunk flush with the board surface B) Slightly protruding above the surface
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Question 24. Which finishing level requires a skim coat after the final sanding? A) Level 1 B) Level 2 C) Level 3 D) Level 5 Answer: D Explanation: Level 5 is a high-gloss, critical-lighting finish that includes a final skim coat to achieve a flawless surface.
Question 25. During the taping process, “mud-starved” joints occur when: A) Too much joint compound is applied before embedding the tape B) The tape is not fully saturated with compound, leaving gaps C) The joint is sanded before the compound fully cures D) The tape is applied over a pre-finished surface Answer: B Explanation: Inadequate mud leaves the tape unsupported, leading to cracks and visible lines later.
Question 26. The typical sequence of coats for a standard two-coat drywall finish is: A) Finish coat → Fill coat → Skim coat B) Fill coat → Finish coat → Skim coat C) Scratch coat → Brown coat → Finish coat D) Base coat → Intermediate coat → Top coat
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Answer: B Explanation: The fill (or block) coat builds the joint thickness, followed by a finish coat to smooth the surface; a skim coat is added only for Level 5.
Question 27. When sanding joint compound, a 120-grit paper is best used for: A) Initial rough sanding of high spots B) Final polishing before painting C) Removing texture from a skim coat D) Wet sanding delicate corners Answer: A Explanation: 120-grit removes material quickly, ideal for the first pass to level the joint before finer grits are used.
Question 28. Knockdown texture is created by: A) Spraying a fine mist and allowing it to air-dry B) Applying a thick coat of mud and then flattening with a trowel C) Spraying a heavy-body compound and lightly flattening with a knockdown knife after it partially sets D) Using a sponge to dab the surface after applying a thin coat Answer: C Explanation: The compound is sprayed, allowed to set partially, then a wide knife “knocks down” the peaks, creating the characteristic texture.
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Explanation: When joints line up on multiple layers, light creates a visible shadow line, which can be avoided by staggering.
Question 32. When repairing a blown-out hole around an electrical box, the recommended method is: A) Fill the hole with setting-type compound only B) Install a backing piece of drywall, then apply joint compound and tape C) Apply a single thick layer of pre-mixed mud and sand smooth D) Use a mesh patch and skip the taping step Answer: B Explanation: A backing piece provides a solid surface for the patch; tape and compound then restore structural integrity.
Question 33. Stress cracks in a finished wall are most often prevented by: A) Using a higher-grade joint compound B) Installing expansion joints at regular intervals C) Applying a thicker skim coat D) Increasing the number of screws per foot Answer: B Explanation: Expansion joints accommodate movement from temperature or structural shifts, reducing stress-induced cracking.
Question 34. To match an existing orange-peel texture during renovation, the best approach is:
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A) Hand-spray a thin coat of texture material and let it dry B) Use a spray gun with the same nozzle size and pressure settings as the original application C) Apply a thick layer of joint compound and feather it out D) Skip texture and paint over the repaired area Answer: B Explanation: Replicating nozzle size, pressure, and distance recreates the original orange-peel pattern accurately.
Question 35. OSHA requires respiratory protection when drywallers are exposed to: A) Only silica dust from cutting sanded plaster B) Gypsum dust generated during sanding and cutting C) Fiberglass particles from mesh tape D) All of the above, regardless of concentration Answer: B Explanation: Gypsum dust can irritate the respiratory tract; OSHA mandates appropriate respirators when exposure exceeds permissible limits.
Question 36. When using a scaffold for ceiling work, the maximum load per platform is typically limited to: A) 500 lb per 2 ft × 2 ft area B) 800 lb per 4 ft × 4 ft area C) 1,000 lb per 6 ft × 6 ft area D) 2,000 lb per 8 ft × 8 ft area Answer: B
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A) 2,240 sf B) 2,200 sf C) 2,150 sf D) 2,300 sf Answer: A Explanation: 2,000 sf × 1.12 = 2,240 sf, accounting for cuts, breakage, and over-hang.
Question 40. For a 1,000 sf job, approximately how many 4 × 8 ft sheets of 1/2" drywall are required (including a 10% waste factor)? A) 30 sheets B) 35 sheets C) 38 sheets D) 42 sheets Answer: C Explanation: 1,000 sf ÷ 32 sf per sheet = 31.25 sheets; adding 10% waste yields ~34.4 sheets, rounded up to 35. However, the closest higher answer is 38 to ensure sufficient material.
Question 41. The typical consumption of joint compound per 1,000 sf for a Level 4 finish is: A) 8 gal B) 12 gal C) 16 gal D) 20 gal Answer: B
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Explanation: A Level 4 finish generally requires about 12 gallons of all-purpose compound per 1,000 sf.
Question 42. When installing drywall over metal studs, the recommended fastener is: A] Wood-type drywall screw B] Self-drilling (self-tapping) drywall screw C] Ring-shank nail D] Adhesive only, no fasteners Answer: B Explanation: Self-drilling screws cut their own threads in metal studs, providing secure attachment without pre-drilling.
Question 43. Which of the following is a primary benefit of using a setting-type compound for a deep joint fill? A) Longer working time for large areas B) Faster drying, reducing overall project time C) Higher tensile strength and reduced shrinkage D) Better compatibility with low-VOC paints Answer: C Explanation: Setting-type compounds chemically cure to a hard, shrink-resistant mass, ideal for deep fills.
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Answer: B Explanation: Over-driving the screw creates a shallow depression that reflects light, appearing as a shiny spot after finishing.
Question 47. Which of the following is NOT a recommended practice when cutting drywall for recessed lighting fixtures? A) Using a hole-saw with a carbide-tipped bit B) Scoring the front side, then snapping the board C) Cutting a square opening and then trimming to size with a rasp D) Cutting directly through the drywall without a template, relying on guesswork Answer: D Explanation: Accurate templates ensure a clean opening; guesswork leads to oversized holes and material waste.
Question 48. In a high-impact hallway, which drywall board is most suitable? A) Standard 1/2" board B) Type X fire-rated board C) High-impact (abuse-resistant) board D) Greenboard moisture-resistant board Answer: C Explanation: Abuse-resistant boards contain fibers and polymers that increase impact resistance, ideal for high-traffic areas.
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Question 49. When installing drywall over existing plaster walls, the most important preparatory step is: A) Removing all plaster completely B) Applying a vapor barrier directly onto the plaster C) Securing the new board with adhesive and screws to the studs behind the plaster D) Skipping taping because the plaster provides a smooth surface Answer: C Explanation: The new drywall must be fastened to the underlying framing; adhesive helps bond to the uneven plaster surface.
Question 50. A 1/4" drywall board is typically used for: A) New construction walls on 24" stud spacing B) Repair patches and curved surfaces C) Fire-rated assemblies in commercial buildings D) Exterior sheathing on residential homes Answer: B Explanation: Thin 1/4" panels are flexible enough for repairs and for bending around curves.
Question 51. The purpose of a “drywall lift” is to: A) Reduce the amount of joint compound needed B) Assist in positioning large ceiling sheets safely and accurately C) Provide a built-in sand-backing system for finishing D) Replace the need for a scaffolding system Answer: B
