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Question 1. Which type of personal protective equipment is required when cutting silica-containing masonry with a power saw? A) Hearing protectors only B) Disposable N-95 respirator C) Full-face respirator with P100 filter D) Safety glasses Answer: C Explanation: Silica dust is hazardous when inhaled; a full-face respirator with a P100 filter provides the required protection against respirable crystalline silica particles. Question 2. What does the color code “Class B” on a fire extinguisher indicate? A) Ordinary combustibles (wood, paper) B) Flammable liquids (oil, gasoline) C) Electrical fires D) Cooking oils and fats Answer: B Explanation: Class B extinguishers are designed for fires involving flammable liquids such as gasoline, oil, and grease. Question 3. When performing a lockout/tagout (LOTO) on a pneumatic nail gun, which of the following is the first step? A) Remove the nail magazine B) De-pressurize the air line and lock the valve C) Tag the gun with the operator’s name
D) Test the gun after locking Answer: B Explanation: LOTO begins by isolating the energy source; for pneumatic tools, the air supply must be depressurized and the valve locked to prevent accidental discharge. Question 4. Which ergonomic technique reduces the risk of lower-back injury when lifting a 50 lb sheet of plywood? A) Bend at the waist and lift with arms B) Keep the load away from the body C) Squat, keep the load close, and lift with legs D) Twist the torso while lifting Answer: C Explanation: Proper lifting uses a squat position, keeping the load close to the body, and using leg muscles rather than the back, minimizing strain. Question 5. A sheet of 5/8-in. OSB is to be installed as sub-flooring. What is the minimum nail spacing along the edges? A) 6 in. on center B) 8 in. on center C) 10 in. on center D) 12 in. on center Answer: A Explanation: OSB sub-floor edges require nails (or screws) at 6-inch intervals to provide adequate shear resistance and prevent cupping.
Answer: B Explanation: LVL is an engineered wood product with high bending strength, making it ideal for load-bearing beams, joists, and rim boards. Question 9. When selecting a fastener for attaching a 2-in. hardwood block to a steel stud, which property is most critical? A) Shear strength of the screw shank B) Thread pitch C) Withdrawal resistance of the screw in wood D) Head style Answer: C Explanation: The withdrawal resistance determines how well the screw will hold the hardwood against pulling forces from the steel stud. Question 10. Which type of anchor is recommended for securing a heavy countertop to a concrete slab? A) Plastic expansion anchor B) Tap-con (concrete screw) C) Wood screw D) Nail-in hanger Answer: B Explanation: Tap-con concrete screws provide high withdrawal strength in concrete, suitable for heavy loads like countertops.
Question 11. What is the primary function of a weather-resistive barrier (WRB) behind exterior siding? A) Provide structural support B) Prevent moisture infiltration while allowing vapor diffusion C) Insulate the wall cavity D) Serve as a decorative finish Answer: B Explanation: WRB (e.g., house wrap) stops liquid water from entering the wall assembly while permitting the wall to dry outward. Question 12. In a typical residential floor framing layout, studs are spaced at 16 in. on center. What is the advantage of this spacing? A) Reduces lumber usage by 25 % B) Aligns with standard 4-ft sheet dimensions for sheathing C) Increases thermal conductivity D) Allows for larger window openings Answer: B Explanation: 16-in. OC spacing aligns with the 4-ft width of plywood and OSB sheets, minimizing waste and simplifying sheathing installation. Question 13. When framing a rough opening for a 36-in. wide door, which component determines the required header depth? A) Height of the door slab B) Load carried by the wall above the opening C) Thickness of the interior finish material D) Number of interior studs
Question 16. The “rise” of a roof rafter is 9 ft and the “run” is 12 ft. What is the pitch expressed as “X-in- 12 ”? A) 7-in- 12 B) 9-in- 12 C) 12-in- 12 D) 15-in- 12 Answer: A Explanation: Pitch = rise/run × 12 = (9 ft ÷ 12 ft)×12 = 9 in. per 12 in. run; however the rise is 9 ft = 108 in, run 12 ft = 144 in, so 108÷144 = 0.75 → 9 in per 12 in. Thus 9-in-12. (Correct answer B) Answer: B Explanation: Converting feet to inches (9 ft = 108 in, 12 ft = 144 in) gives a ratio of 108/144 = 0.75, which equals 9 in per 12 in run, expressed as 9-in-12. Question 17. Which cut is required on a common rafter to allow it to sit on the ridge board? A) Bird’s mouth (seat cut) B) Tail cut (plumb cut) C) Hip cut D) Crown cut Answer: B Explanation: The tail (or plumb) cut creates a vertical face that sits flush against the ridge board, securing the rafter at the peak. Question 18. In a hip roof, how many hip rafters intersect at the ridge?
A) One B) Two C) Four D) Eight Answer: C Explanation: A hip roof has four hip rafters, each running from a corner of the building to the ridge, forming the sloping edges. **Question 19. What is the purpose of an H-clip in roof sheathing installation? ** A) To attach roofing underlayment to the deck B) To provide a vent opening for attic airflow C) To secure the ends of OSB panels to the joists when the panel does not land on a joist D) To fasten ridge vents Answer: C Explanation: H-clips bridge the gap between the edge of a sheathing panel and the joist, allowing panels to be installed without a full-length joist underneath. Question 20. Which roof underlayment is required in areas prone to ice dam formation? A) Asphalt felt, 15-lb. B) Synthetic underlayment with self-adhesive backing C) Ice and water shield (self-adhesive polymer) D) No underlayment needed
Question 23. What is the minimum recommended over-hang for roof soffit ventilation on a low-slope roof? A) 1 in. B) 2 in. C) 4 in. D) 6 in. Answer: C Explanation: A 4-in. soffit over-hang provides sufficient space for airflow and helps protect the roof edge from wind-driven rain. Question 24. Which type of crown molding installation method results in the least visible joint at the corners? A) Simple miter cut on both pieces B) Coping the inside corner and mitering the outside C) Butt joint with caulk D) Using a spline Answer: B Explanation: Coping the inside corner of crown molding ensures a tight fit that hides imperfections, while the outside is mitered for a clean appearance. Question 25. According to the International Residential Code (IRC), what is the maximum riser height for a residential stair? A) 6 in. B) 7 in. C) 7 ¾ in.
D) 8 in. Answer: C Explanation: The IRC permits a maximum riser height of 7 ¾ in. for residential stairs to ensure safety and comfort. Question 26. When scribing a base cabinet to an uneven wall, which tool provides the most accurate reference line? A) Framing square B) Chalk line C) Laser level D) Straight edge Answer: C Explanation: A laser level projects a true horizontal line onto the wall, allowing precise scribing of the cabinet to follow the wall’s irregularities. Question 27. Which adhesive is appropriate for bonding sub-floor panels to a concrete slab? A) Construction adhesive (polyurethane-based) B) White wood glue C) Epoxy mortar D) Hot-melt glue Answer: A Explanation: Polyurethane construction adhesives are formulated to bond wood to concrete, providing flexibility and moisture resistance.
Answer: B Explanation: A rotary laser level projects a 360-degree level beam, allowing quick and accurate grade checks over large areas. Question 31. Which fire-resistant rating is required for a residential garage door according to the IRC? A) No rating required B) 20-minute fire rating C) 45-minute fire rating D. 60-minute fire rating Answer: C Explanation: The IRC mandates a minimum 45-minute fire-rated door for residential garages to limit fire spread. Question 32. When using a pneumatic nail gun, what is the recommended maximum air pressure for 2-in. framing nails? A) 40 psi B) 60 psi C) 80 psi D) 100 psi Answer: C Explanation: Most framing nail guns operate optimally at 80 psi for 2-in. nails, delivering sufficient driving force without damaging fasteners. Question 33. Which type of saw blade is required for cutting hardwood lumber with minimal tear-out?
A) Low-tooth (24-TPI) carbide blade B) High-tooth (80-TPI) carbide blade C) Diamond blade D) Abrasive blade Answer: B Explanation: A high-tooth count (80 TPI) carbide-tipped blade provides a finer cut and reduces tear-out on hardwood. Question 34. In a floor framing system, what is the purpose of “blocking” between joists? A) To increase overall floor height B) To provide a nailing surface for flooring and prevent joist rotation C) To act as a moisture barrier D) To replace joist hangers Answer: B Explanation: Blocking ties joists together, offers a solid nailing base for sub-floor, and prevents joist twisting under load. Question 35. Which of the following is an acceptable method for protecting a freshly cut concrete slab from moisture loss? A) Spraying water continuously B) Covering with a polyethylene sheet C) Applying a coat of paint immediately D. Leaving it exposed Answer: B
B) Beam to column steel plate C) Angle brace D. T-nailer Answer: B Explanation: A steel bearing plate (beam-to-column bracket) transfers loads from the wood beam to the steel column safely. Question 39. A carpenter is using a 24-in. level to check a wall for plumb. The bubble is centered. What does this indicate? A) The wall is perfectly vertical B) The wall is out of plumb by 1 mm C) The level is not calibrated D) The wall is out of plumb but within tolerance Answer: A Explanation: When the bubble is centered on a level, the surface being measured is plumb (or level) within the instrument’s tolerance. Question 40. Which grade of plywood is suitable for exterior sheathing in a humid climate? A) CDX (exterior grade) B) AC (interior grade) C) B/BB (interior grade) D. D (interior grade) Answer: A
Explanation: CDX plywood is rated for exterior exposure, resisting moisture and providing adequate strength for sheathing. Question 41. What is the primary advantage of using a self-drilling (Tek) screw for metal stud framing? A) Eliminates the need for pre-drilling pilot holes B) Provides a decorative head C) Increases shear strength of the stud D. Allows for reversible installation Answer: A Explanation: Self-drilling screws have a built-in drill point, allowing direct installation into metal studs without pre-drilling. Question 42. When installing a pre-engineered roof truss, what is the minimum spacing for truss bracing? A) Every 2 ft along the length B) Every 4 ft along the length C) Every 6 ft along the length D. No bracing required if the truss is rated Answer: B Explanation: Most manufacturers require bracing at 4-ft intervals to prevent lateral movement during handling and service. Question 43. Which of the following best describes “draw-bore” in fastener terminology? A) The distance a screw can be driven before breaking
Explanation: Class C fire protection is required for walls separating a garage (where electrical equipment may be present) from living areas. Question 46. In a standard 2×4 stud wall, what is the nominal spacing for a load-bearing wall in a multi-story building? A) 12 in. OC B) 16 in. OC C) 24 in. OC D) 36 in. OC Answer: B Explanation: 16 in. on-center spacing provides sufficient load distribution for typical residential load-bearing walls. Question 47. Which tool is most appropriate for creating a precise “bird’s-mouth” cut in a rafter? A) Circular saw with a jig B) Hand saw and chisel C) Table saw with a dado blade D. Miter saw Answer: A Explanation: A circular saw with a bird’s-mouth jig allows accurate and repeatable cuts for rafter seats. Question 48. When installing a vinyl siding trim piece, what is the recommended nail size? A) 1-in. finish nail
B) 1-1/2-in. common nail C) 2-in. roofing nail D. 3-in. screw Answer: B Explanation: A 1-1/2-in. common nail provides enough penetration into the sheathing while avoiding over-driving the trim. Question 49. Which of the following is a characteristic of “green” (unseasoned) lumber? A) Low shrinkage after installation B) High dimensional stability C) High moisture content, prone to warping D. Low density Answer: C Explanation: Green lumber contains high moisture, leading to shrinkage, warping, and checking as it dries. Question 50. What is the primary function of a “ridge vent” in roof ventilation design? A) To provide a water-tight seal at the ridge B) To allow warm air to escape from the attic space C) To support the ridge board structurally D. To hold roofing shingles in place Answer: B
