CSLB General Building (B) — All Questions

A standard guardrail system is used as the primary fall protection along an open edge. In any outward or downward direction, the top rail must be able to withstand a MINIMUM applied load of about how much without failing?

• a.500 pounds
• b.200 pounds✓
• c.50 pounds
• d.1,000 pounds

Correct: a guardrail top rail must resist roughly a 200-pound force applied in any outward or downward direction. 50 pounds is closer to the midrail/toeboard test load, not the top rail. 500 and 1,000 pounds overstate the requirement; that magnitude is associated with anchorage points for personal fall arrest, not guardrails.Cal/OSHA Title 8 §1620(c) (Railings)

On a guardrail system protecting an edge where tools could fall onto workers below, a toeboard is added. About what MINIMUM height must the toeboard rise above the walking surface?

• a.12 inches
• b.1 inch
• c.3.5 inches (approximately 4 inches)✓
• d.9 inches

Correct: a toeboard must be at least about 3.5 to 4 inches high above the walking/working surface to keep tools and debris from being kicked off the edge. 1 inch is too short to retain material. 9 and 12 inches exceed what is required and are not the standard minimum; a midrail (not a toeboard) sits near mid-height around 21 inches.

A worker on a wall form uses a device that holds them in place and lets them lean back to work hands-free, limiting any fall to no more than 2 feet. This describes which system?

• a.A personal fall arrest system, which lets the worker fall free and then decelerates the fall with a shock-absorbing lanyard
• b.A positioning device system, which supports the worker and limits a free fall to about 2 feet✓
• c.A travel restraint system that prevents reaching the edge at all, keeping the worker's lanyard too short to arrive at the opening
• d.A safety monitoring system

Correct: a positioning device holds a worker in place on a vertical surface and is limited so a free fall cannot exceed about 2 feet. A fall arrest system stops a longer fall (up to 6 ft free fall) after it starts. Travel restraint keeps a worker from ever reaching the edge, not leaning against a support. A safety monitor is a person watching for hazards, not a device.Cal/OSHA Title 8 §1670(c)(1) (Positioning Device Systems)

A temporary cover is placed over a floor opening in a walkway. Which set of requirements BEST describes a compliant hole cover?

• a.It must be removable by hand at any time and left unsecured for quick access to the opening
• b.It must be painted red only, with no strength requirement, so its color alone warns passing workers
• c.It must support at least twice the maximum intended load, be secured against displacement, and be marked to warn of the hazard✓
• d.It only needs to fully hide the hole from view so that nobody walking the deck steps toward it

Correct: a compliant floor-hole cover must carry at least twice the maximum intended load (workers, equipment, materials), be secured so it cannot shift or be accidentally removed, and be marked (e.g., 'HOLE' or 'COVER') to warn workers. Color alone, hiding the hole, or leaving it loose for 'quick access' all fail the securing, strength, and marking requirements.Cal/OSHA Title 8 §1632(b)(3) (Covers)

Safety nets are chosen as fall protection under a leading edge. Which pair of requirements is correct for safety nets?

• a.The net only needs to cover half the fall zone, with the remaining area left open below the leading edge where the workers move
• b.The net may hang up to 60 ft below the work, with any mesh size, since the fall distance and the opening are left to the installer
• c.The net must be installed as close as practical under the work but never more than 30 ft below it, and each mesh opening may be no larger than 36 square inches✓
• d.The net must be exactly 10 ft below the work, with 100-square-inch openings, set at that one fixed distance on every job

Correct: safety nets must be installed as close under the walking/working surface as practical and never more than 30 ft below it, and mesh openings must not exceed 36 square inches (nor 6 inches on a side). Hanging 60 ft below or unlimited mesh would let workers strike a lower level or pass through. A fixed 10 ft with 100-square-inch openings and 'half the fall zone' are both non-compliant; nets must cover the full potential fall area.

A supported scaffold and its components are being specified. Each part of the scaffold and its supports must be capable of holding at least how many times the maximum intended load without failure?

• a.4 times✓
• b.6 times
• c.10 times
• d.2 times

Correct: scaffolds and their components must support at least 4 times the maximum intended load. A 2:1 ratio is the criterion for a non-engineered fall-arrest anchorage, not scaffold capacity. Suspension ropes carry a 6:1 factor, but that applies to the rope, not the overall scaffold structure. 10 times is not the general scaffold requirement.Cal/OSHA Title 8 §1637(b)(2) (Scaffolds — Design Load)

Wood platform planks on a scaffold are supported at each end. Where planks are overlapped rather than butted, the overlap must occur over a support and extend at least how far past the centerline of the support?

• a.At least 2 inches
• b.At least 12 inches✓
• c.At least 6 inches
• d.At least 24 inches

Correct: overlapped planks must overlap only over a support and extend at least 12 inches beyond the support's centerline (unless cleated or otherwise restrained). A 2- or 6-inch overlap risks the plank sliding off. 24 inches is more than required and, at the far end, a plank should not extend excessively past a support (generally no more than about 12-18 inches unless designed) to avoid a tipping/see-saw hazard.

Workers need to reach a scaffold platform 9 feet above the base. Which access method is required under Cal/OSHA?

• a.Workers may climb the diagonal cross-braces since they are part of the frame, treating the braces as the rungs of a built-in ladder to the platform
• b.A ladder, stair tower, ramp, or equivalent access must be provided; climbing the cross-bracing is prohibited✓
• c.Any worker may free-climb the end frames if under 20 feet, because a fall from that height is treated as a short one and needs no separate access
• d.Access is only required for platforms above 20 feet, so a crew working below that height climbs whatever part of the scaffold is nearest to them

Correct: safe access such as a ladder, stair tower, ramp, or built-in frame access must be provided when a platform is more than about 2 feet above or below a point of access; climbing cross-braces is expressly prohibited because they are not designed as a ladder. Free-climbing end frames and the 20-foot thresholds are incorrect; access is required well below 20 feet.Cal/OSHA Title 8 §1637(n)(1) (Scaffold Access)

Who must inspect a scaffold for visible defects, and how often, before it is used?

• a.A competent person, before each work shift and after any event that could affect its structural integrity✓
• b.Any available worker, once a week, noting loose planks on the tag at the access point kept at the bottom of the run
• c.A licensed engineer, once at erection only, with no further look after the crew loads it and no re-inspection after that
• d.The scaffold manufacturer, monthly

Correct: a competent person must inspect the scaffold before each work shift and after any occurrence (such as a storm or being struck) that could affect structural integrity. A weekly check by any worker, a one-time engineer inspection, or monthly manufacturer visits all miss the required per-shift, competent-person inspection that catches loose planks, damaged parts, and settlement.

CALCULATION: A metal scaffold has a least base dimension of 5 feet. Ties at the free ends come first, once the platform exceeds 3 times that dimension. At what platform height must the remaining ties of the first row be in place?

• a.20 feet✓
• b.10 feet
• c.40 feet
• d.25 feet

Correct: §1644(a)(5)(A) requires the remaining first-row ties when the platform height is four times the least base dimension, so 4 x 5 ft = 20 ft. The free-end ties come earlier, when the platform exceeds 15 ft (3 x 5 ft). 10 ft is only 2 times the base, and 25 ft and 40 ft are later than the rule allows.Cal/OSHA Title 8 §1644(a)(5)(A)

On a large jobsite a scaffold tagging system is used at access points. A worker sees a YELLOW tag on a scaffold. What does this MOST likely indicate?

• a.The scaffold is incomplete or has a specific hazard; it may be used only with additional precautions such as personal fall protection✓
• b.The scaffold is scheduled for removal tomorrow, so the tag tells the crew when the dismantling crew will arrive
• c.The scaffold is fully complete and safe for normal use, with every plank, rail and tie in place and inspected
• d.The scaffold must not be used under any circumstances, and no worker may climb it until the tag is changed

Correct: in the common green/yellow/red tag system, yellow (caution) means the scaffold is incomplete or has a special hazard and may be used only with extra precautions like a PFAS. Green means complete and safe for normal use; red (danger/do-not-use) means it must not be used. A removal schedule is not what a yellow tag communicates.

A supported scaffold is being erected on graded soil. What is the BEST practice for the scaffold's footing?

• a.Rest the legs directly on loose backfill to allow drainage away from the base
• b.Place the legs on the spoil pile since it is close to the work and saves moving material
• c.Set base plates on mud sills or another firm, level foundation capable of carrying the load without settling✓
• d.Support the legs on stacked concrete blocks or bricks for height adjustment on uneven ground

Correct: scaffold legs need base plates bearing on mud sills or another firm, level, load-rated foundation so the scaffold cannot settle or shift. Loose backfill, stacked blocks or bricks, and a spoil pile are all unstable, unequal supports expressly discouraged because they can crush, tip, or sink under load, collapsing the scaffold.

CALCULATION: A portable straight ladder rests against a wall where the top touches the wall 16 feet above the base. To meet the 4:1 pitch rule, about how far out from the wall should the ladder's feet be placed?

• a.2 feet
• b.3 feet
• c.1 foot
• d.4 feet✓

Correct: the 4:1 rule sets horizontal distance = working height / 4 = 16 / 4 = 4 ft. This produces the roughly 75.5-degree angle for safe use. 1, 2, or 3 feet would make the ladder too steep (approaching vertical), increasing the risk of tipping backward as a worker climbs.Cal/OSHA Title 8 §3276(e)(9) (Portable Ladders), applied to construction by §1675(b)

A ladder is stamped 'Type IA.' What MAXIMUM working load (duty rating) does this designation indicate?

• a.300 pounds✓
• b.375 pounds
• c.250 pounds
• d.225 pounds

Correct: Type IA is an extra-heavy-duty industrial ladder rated to 300 pounds. Type I (heavy duty) is 250 lb, Type II (medium) is 225 lb, and Type IAA (special heavy duty) is 375 lb. Selecting a ladder means matching its duty rating to the combined weight of the worker plus tools and materials.Cal/OSHA Title 8 §3276(d)(2) (Ladder Duty Ratings)

A crew must work near exposed energized electrical conductors. Which ladder choice is BEST for this task?

• a.Any metal ladder as long as workers wear gloves, since the gloves break the path to ground and keep current out of the worker
• b.An aluminum ladder because it is lighter to position, letting one worker move it along the wall between conductors without help
• c.A ladder made of nonconductive material such as fiberglass✓
• d.A steel ladder because it is more rigid, so it flexes less when a worker reaches sideways toward the energized conductors

Correct: near exposed energized parts, ladders must be made of nonconductive side rails, such as fiberglass, to reduce electrocution risk. Aluminum and steel ladders conduct electricity and are prohibited in that setting regardless of weight or rigidity, and gloves alone do not make a metal ladder safe near live conductors.

A worker sets up a stepladder to reach a ceiling fixture. Which practice is correct?

• a.Lean the folded stepladder against the wall like a straight ladder to gain height, since the closed rails are stiff enough to carry the worker
• b.Have a second worker climb the back rails at the same time for efficiency, so one can hand the fixture up while the other sets the screws
• c.Stand on the very top cap to reach a few inches higher
• d.Open the stepladder fully, lock the spreaders, and do not stand on the top cap or the top step✓

Correct: a stepladder must be fully opened with spreaders locked, and the top cap and top step must not be used as standing surfaces because balance is lost. A stepladder must never be leaned closed against a wall (it is not built for that), no one should stand on the top cap, and only one person at a time may be on it.

A single portable ladder is used repeatedly to access an upper landing. Which combination of practices BEST reduces the risk of the ladder shifting or a worker falling?

• a.Leave the base loose so the ladder can self-adjust to the ground, and slide down the rails to descend more quickly
• b.Allow two workers on the ladder at once to pass materials up to the landing and save climbing trips
• c.Secure the ladder at the top, block or tie the base against slipping, face the ladder, and keep three points of contact while climbing✓
• d.Carry tools in both hands and climb quickly to spend less time on the ladder and finish the task sooner

Correct: securing the top, stabilizing the base against sliding, facing the ladder, and maintaining three points of contact are the core safe-climbing practices. Climbing with full hands, sliding the rails, leaving the base loose, or putting two workers on one ladder all defeat stability and three-point contact and are unsafe.

A competent person classifies excavation soil by unconfined compressive strength. Which value range correctly identifies Type B soil?

• a.1.5 tons per square foot or greater
• b.Greater than 0.5 but less than 1.5 tons per square foot✓
• c.Exactly 0 tons per square foot (running soil only)
• d.Less than 0.5 tons per square foot

Correct: Type B soil has an unconfined compressive strength greater than 0.5 but less than 1.5 tsf. Type A is 1.5 tsf or greater (the most stable cohesive soil), and Type C is less than 0.5 tsf (least stable). A value of exactly 0 does not define a class; classification uses the ranges above along with other factors like layering and water.Cal/OSHA Title 8 §1541.1, Appendix A (Soil Classification)

CALCULATION: A 6-foot-deep trench in Type A soil will be protected by sloping instead of shoring. Type A allows a maximum slope of 3/4 horizontal to 1 vertical (about 53 degrees). Measured from the trench bottom, how far back from the edge (horizontal run on each side) must the top of the slope extend?

• a.4.5 feet✓
• b.6 feet
• c.8 feet
• d.3 feet

Correct: horizontal run = depth x (3/4) = 6 x 0.75 = 4.5 ft on each side. 3 ft and 6 ft do not match the 3/4:1 ratio for Type A; 8 ft would correspond to a flatter slope than required. Sloping calculations multiply the trench depth by the horizontal component of the allowed ratio for that soil type.Cal/OSHA Title 8 §1541.1, Appendix B, Table B-1 (Maximum Allowable Slopes)

A contractor wants to use a benched (stepped) excavation wall as the protective system. In which soil is benching NOT permitted?

• a.Type A soil
• b.Stable rock
• c.Type C soil✓
• d.Type B soil

Correct: benching is not allowed in Type C soil because it is too unstable to hold vertical steps; Type C must be sloped, shored, or shielded. Benching is permitted in Type A and Type B soils under the allowable configurations, and stable rock is competent enough to stand vertically. The key limitation is that Type C cannot be benched.

CALCULATION: A trench 5 feet deep and 100 feet long requires a means of egress so no worker travels more than 25 feet of lateral distance to reach a ladder. What is the MINIMUM number of ladders needed, spaced so every point is within that distance?

• a.4 ladders
• b.2 ladders✓
• c.5 ladders
• d.1 ladder

Correct: with a 25-ft maximum lateral travel, one ladder covers 25 ft to its left and 25 ft to its right, i.e., a 50-ft span. A 100-ft trench therefore needs 100 / 50 = 2 ladders, positioned so their coverage zones span the length. One ladder covers only 50 ft (leaving the ends beyond 25 ft); 4 or 5 ladders exceed the minimum required.Cal/OSHA Title 8 §1541(c)(2) (Means of Egress from Trench Excavations)

Before mechanized digging begins, an excavator must have underground utilities located and marked. In California, what is the general requirement for notifying the regional notification center (DigAlert / 811)?

• a.No notice is needed if the dig is under 5 feet deep, because shallow work is assumed to stay above the depth at which utilities are buried
• b.Contact the regional notification center at least two working days before excavating so utilities can be marked✓
• c.Call only if the excavator personally believes a line is present, relying on the operator's reading of the site rather than on a marking request
• d.Notify the utility owner within 24 hours after digging starts, so the locator can mark the lines while the trench is already being opened

Correct: California law requires contacting the regional notification center (DigAlert / 811) generally at least two working days before excavating so member utilities can locate and mark their lines. Notifying after digging starts, skipping notice for shallow digs, or relying on personal judgment all violate the advance-locate requirement and risk striking gas, electric, or other buried lines.CA Government Code §4216.2(a) (Regional notification center / DigAlert)

Workers will enter a 7-foot-deep excavation next to a former solvent storage area where a hazardous atmosphere could exist. Under Cal/OSHA, what is required before and during entry?

• a.Nothing special, because open excavations always have fresh air, since anything heavier than air would simply drift off the open top
• b.Test the atmosphere for oxygen level and hazardous gases before entry and as often as needed, and provide controls such as ventilation where a hazard could exist✓
• c.Rely on workers noticing symptoms and leaving on their own, treating dizziness or a headache as the signal to climb out of the trench
• d.Test only once at the start of the shift and assume conditions stay safe, since the reading at the opening covers the whole day

Correct: where a hazardous atmosphere could reasonably exist in an excavation deeper than 4 ft (near contamination, fuels, or where oxygen may be deficient), the atmosphere must be tested before entry and regularly thereafter, with controls like ventilation and emergency provisions. Assuming fresh air, testing only once, or waiting for symptoms all fail to protect against odorless, invisible hazards.Cal/OSHA Title 8 §1541(g)(1)(A) (Hazardous Atmospheres in Excavations)

During lockout/tagout (LOTO) on a jobsite, several workers each apply their own personal lock to an energy-isolating device. Who is authorized to remove a given worker's lock?

• a.Any supervisor who wants the equipment back in service, since the schedule is the supervisor's call
• b.Any qualified electrician on site, because that training carries the authority to clear the device
• c.The first worker who finishes the task, clearing every lock so the crew can restore power at once
• d.Only the individual worker who applied that lock (with narrow exceptions under a documented procedure)✓

Correct: under LOTO, each worker's personal lock may be removed only by that same worker, ensuring no one is re-energizing equipment while another is still exposed. Narrow exceptions exist when that worker is unavailable, but only through a documented procedure with verification. Letting a supervisor, the first-finished worker, or any electrician remove another's lock defeats the whole protection.

Cal/OSHA gives employers two accepted ways to protect workers from ground faults when using temporary power for hand tools. What are they?

• a.Wearing rubber boots to insulate the worker, OR posting a warning sign at the panel
• b.Double-insulated tools only, OR longer extension cords run back to a house outlet
• c.Battery tools only, OR daily visual checks of cords with no records kept
• d.GFCI protection on the receptacles, OR a written Assured Equipment Grounding Conductor Program✓

Correct: the two accepted options are ground-fault circuit interrupter (GFCI) protection on construction receptacles, or an Assured Equipment Grounding Conductor Program (a documented inspection/testing program for cords and grounding). Double insulation, boots, signs, and informal visual checks are supplementary at best and do not by themselves satisfy the ground-fault protection requirement.

Boom-type lifting equipment will operate near an overhead power line energized at 50 kV or less. What MINIMUM clearance must be maintained between the line and any part of the equipment or load, absent other controls?

• a.10 feet✓
• b.6 feet
• c.3 feet
• d.15 feet

Correct: Table 2 of §2946 sets a minimum of 10 feet for boom-type lifting or hoisting equipment near lines from 600 volts to 50 kV, and the distance increases at higher voltages. 6 ft is the Table 1 general clearance for other activity at that voltage, not for boom-type equipment. 3 ft is too close, and 15 ft is more conservative than the minimum for this voltage.Cal/OSHA Title 8 §2946(b)(3) and Table 2 (Clearances from Energized Overhead High-Voltage Lines)

On site, a worker finds an extension cord with the grounding prong broken off and the outer jacket split. What is the BEST action?

• a.Remove the cord from service and tag or discard it so it cannot be used until properly repaired or replaced✓
• b.Use it only for low-power tools since the damage is minor, keeping it on lights and chargers that draw little current through the split jacket
• c.Wrap the split with electrical tape and keep using it, since the tape restores the jacket and the tool's own case still isolates the worker
• d.Bend the remaining prongs to fit and continue working, because the two power prongs still seat in the receptacle and the tool runs normally

Correct: a damaged cord with a missing ground prong and split jacket is a shock and fire hazard and must be removed from service immediately, tagged or discarded so no one uses it until it is properly repaired or replaced. Taping the jacket, forcing bent prongs, or limiting it to 'low-power' tools all leave a hazardous, ungrounded cord in use.

An electrician will work near energized conductors up to 20 kV. Which class of hard hat is designed to protect against that level of electrical contact?

• a.Class C (Conductive)
• b.Class G (General)
• c.Class E (Electrical)✓
• d.Class C with a metal shell for durability

Correct: Class E (Electrical) hard hats are tested to withstand roughly 20,000 volts and are intended for electrical work. Class G (General) is tested only to about 2,200 volts, so it is inadequate near 20 kV. Class C (Conductive) offers no electrical protection at all and may contain conductive material. A metal-shell hat would increase the shock hazard, not reduce it.

A framer must work on foot alongside moving equipment during daytime on a private site. Under a high-visibility apparel standard, which garment class provides the GREATEST conspicuity for the highest-risk situations such as high traffic speeds or low light?

• a.Class 3✓
• b.Class 2
• c.A plain bright T-shirt with no reflective material
• d.Class 1

Correct: Class 3 high-visibility apparel has the most background and reflective material (often covering the torso plus sleeves and/or legs) and is specified for the highest-risk conditions. Class 1 has the least material and suits low-speed, low-risk areas. Class 2 is a middle level for moderate traffic. A plain bright shirt with no retroreflective tape does not meet any ANSI/ISEA class.

On a jobsite, which item of required personal protective equipment must the EMPLOYER generally provide at no cost to the employee?

• a.Steel-toe boots when the employer allows them to be worn off-site as regular footwear
• b.Everyday prescription eyeglasses the worker also wears off the job
• c.A non-specialty face shield and safety goggles needed for a grinding task✓
• d.Ordinary weather gear such as a raincoat for cold rain

Correct: employers must furnish, at no cost, PPE required to protect against jobsite hazards, such as a face shield and goggles for grinding. Prescription eyeglasses worn on and off the job are a common exception the employer need not pay for (though prescription inserts for required protectors are covered differently). Ordinary weather gear and everyday non-specialty footwear allowed for off-site use are recognized exceptions the employer generally need not provide free.

Before an employee is fit-tested for a tight-fitting respirator, what must occur FIRST?

• a.The employee must wear the respirator for a full shift as a trial run first
• b.The employee must receive a medical evaluation to determine fitness to wear a respirator✓
• c.The employee must pass a quantitative fit test before any evaluation
• d.A supervisor must select the respirator brand the worker prefers to wear

Correct: a medical evaluation to determine the worker can safely wear a respirator must be completed before fit testing and use, because breathing through a respirator adds physiological stress. A fit test comes after, not before, the medical clearance. Wearing it a full shift is not a prerequisite. Brand preference does not drive selection; the hazard and required protection factor do.Cal/OSHA Title 8 CCR §5144

A worker needs protection where the airborne contaminant is about 8 times the exposure limit. A half-mask air-purifying respirator has an assigned protection factor (APF) of 10. What does that APF tell you?

• a.Ten workers can share one respirator per shift, so a single mask covers the whole crew that day
• b.The respirator removes exactly 10 percent of the contaminant from the air passing through the filter
• c.A properly fitted half-mask should keep exposure to about one-tenth of the outside concentration, which is adequate here✓
• d.The respirator can be used up to 10 hours before replacement, no matter the concentration

Correct: an APF of 10 means a properly selected, fitted, and used half-mask is expected to reduce the wearer's exposure to about one-tenth (10 percent) of the ambient concentration. Since the hazard is about 8 times the limit, reducing to one-tenth brings exposure below the limit, so it is adequate. APF is not a percent removed, a time limit, or a number of users; it is a workplace protection ratio.Cal/OSHA Title 8 §5144(d)(3)(A)1, Table 1 (Assigned Protection Factors)

A worker with a full beard is assigned to wear a tight-fitting half-face respirator. What is the MAIN problem?

• a.A beard only matters for full-face respirators, not half-face, because the larger facepiece seals over more of the jaw
• b.The beard makes the cartridges clog faster as loose hair is drawn into the inlet with each breath
• c.Facial hair along the sealing surface prevents a reliable face-to-facepiece seal, so the respirator cannot be relied upon✓
• d.Facial hair increases the assigned protection factor by adding a layer that filters air before the facepiece

Correct: any facial hair that crosses the sealing surface of a tight-fitting respirator breaks the seal and lets contaminated air leak in, so the respirator cannot be relied upon and the worker cannot pass a fit test. Options addressing cartridge clogging or a higher protection factor are false. The seal problem applies to any tight-fitting respirator, half-face or full-face; a loose-fitting PAPR/hood is the usual alternative for bearded workers.Cal/OSHA Title 8 §5144(g)(1)(A) (Facepiece Seal Protection)

For respirable crystalline silica in construction, the permissible exposure limit is about 50 micrograms per cubic meter as an 8-hour average. At approximately what airborne level does the 'action level' trigger additional requirements such as exposure monitoring?

• a.About 100 micrograms per cubic meter, measured the same way as an 8-hour average
• b.About 25 micrograms per cubic meter (8-hour average)✓
• c.About 5 micrograms per cubic meter, measured the same way as an 8-hour average
• d.About 250 micrograms per cubic meter, measured the same way as an 8-hour average

Correct: the action level is roughly half the PEL, about 25 micrograms per cubic meter as an 8-hour average; reaching it triggers duties such as exposure assessment and medical surveillance eligibility. Five micrograms is far too low and matches lead-related figures, not silica. One hundred and 250 micrograms both exceed the PEL itself, so they cannot be the action level.Cal/OSHA Title 8 §1532.3(b) and (d)(1) (Respirable Crystalline Silica)

A contractor wants to control silica by following the standard's 'Table 1' approach rather than doing exposure sampling. When using a handheld masonry saw outdoors, which Table 1 control is specified?

• a.Use an integrated water-delivery system that continuously wets the blade to suppress dust✓
• b.Run the saw dry but keep bystanders 10 feet away from the cutting area
• c.Only cut in the morning when humidity is higher and dust settles faster
• d.Provide workers a paper dust mask and sweep up the dry cuttings afterward

Correct: Table 1 pairs the handheld masonry saw with a continuous water-delivery (wet-cutting) system, and workers follow the listed control and respirator requirement without separate air sampling. A paper dust mask with dry sweeping is not the specified engineering control. Keeping bystanders back or relying on humidity does not suppress the dust at the point of generation as Table 1 requires.Cal/OSHA Title 8 §1532.3, Table 1, item (ii) (Handheld Power Saws)

On a lead-in-construction job in California, the airborne action level is 2 micrograms per cubic meter and the permissible exposure limit is 10 micrograms per cubic meter (8-hour average). What is the PRIMARY significance of exposure reaching the action level?

• a.It triggers ongoing duties such as periodic exposure monitoring and starting a medical surveillance program for exposed workers✓
• b.Work must stop entirely until lead is removed, with the crew off the job until the surfaces are stripped
• c.It only requires posting a warning sign at the property line, with no further duty once the notice is up
• d.Respirators alone become sufficient with no other measures, so controls and washing facilities can be skipped

Correct: reaching the lead action level (2 micrograms per cubic meter) triggers continuing obligations, notably periodic exposure monitoring and blood-lead testing under medical surveillance for exposed workers. Work does not automatically stop. Respirators are only one part of a required program that also includes controls and hygiene facilities. A property-line sign is not the defining requirement of the action level.Cal/OSHA Title 8 CCR §1532.1

A contractor plans to disturb about 150 square feet of asbestos-containing wall material during a remodel. Which requirement applies in California?

• a.It can be handled the same as ordinary demolition debris, bagged with the rest of the tear-out and hauled to the dump
• b.Work of this size generally requires a contractor registered/certified for asbestos-related work, with proper notification and containment✓
• c.No special rules apply below 1,000 square feet, so a job this size proceeds under the ordinary remodeling permit
• d.Any contractor may remove it as long as workers wear dust masks, with the debris swept up and the room aired out after

Correct: once the amount disturbed exceeds about 100 square feet, asbestos-related work in California generally must be done by a contractor registered and certified for that work, with proper notification, trained workers, containment, and licensed abatement procedures. Ordinary dust masks and treating it as routine debris are unsafe and noncompliant. There is no 1,000-square-foot free pass; the threshold is far lower.California Business & Professions Code §7058.5 (Asbestos Certification)

Under California outdoor heat illness rules, how much drinking water must an employer be able to provide per employee for a typical shift, at minimum?

• a.Only as much as workers request, with no set amount
• b.At least 1 pint per hour
• c.At least 1 quart (about 1 liter) per hour✓
• d.At least 1 gallon per full shift regardless of length

Correct: the standard requires enough fresh, pure, suitably cool water so each employee can drink at least 1 quart per hour, meaning about 2 gallons per person over an 8-hour shift. One pint per hour is only half that and is insufficient. A flat 1 gallon for the whole shift falls short on a hot day. Water must be actively provided and encouraged, not merely furnished on request.Cal/OSHA Title 8 CCR §3395

When shade must be provided for a crew, roughly how much shade area does the heat standard expect the employer to make available?

• a.Enough shade to accommodate the number of employees on recovery or rest periods, and those on meal breaks who are onsite, at one time✓
• b.No sizing requirement as long as some shade exists somewhere on the site, even if the crew has to wait in turns to get under it during the shift
• c.Shade for only one worker at a time, taken in turns, with the rest of the crew waiting in the sun until a place opens up throughout the day
• d.A single 3-foot-square patch regardless of crew size, kept in the same spot for the whole shift no matter how many are working or the weather

Correct: the shade must be large enough to seat, at one time, the employees on recovery/rest periods plus those onsite on meal breaks, without workers having to be in physical contact. Shade for just one worker at a time, a fixed tiny patch, or unspecified 'some shade' would not meet the crew-based sizing intent of the rule.Cal/OSHA Title 8 CCR §3395

A crew includes several new hires during a heat wave. What does the heat standard expect regarding acclimatization for workers newly assigned to a high-heat area?

• a.They should work faster to finish before the hottest part of the day, so the crew is out of the high-heat area when it peaks
• b.No special attention is needed if they wear light clothing, since loose light fabric keeps a new worker cool enough to work
• c.They should be closely observed during a break-in period of about the first 14 days, with new or returning workers watched especially closely✓
• d.They must pass a physical fitness test before starting, with the result standing in for any break-in period on the job

Correct: because unacclimatized workers are at much higher risk, the standard calls for close observation during an acclimatization break-in period of roughly the first 14 days for new employees, and heightened attention to any worker newly exposed to high heat (including those returning after time away). Light clothing alone, working faster, or a fitness test do not substitute for gradual acclimatization and supervision.Cal/OSHA Title 8 CCR §3395

A mobile crane's load chart shows its rated capacity decreasing as the load is moved farther from the crane. What happens to the crane's safe rated capacity as the operating RADIUS increases?

• a.It stays the same because the crane's weight does not change with radius
• b.It depends only on wind speed at the site, not radius or load position
• c.It decreases, because a longer radius creates a greater tipping/overturning moment✓
• d.It increases because leverage helps the crane lift farther out

Correct: as the horizontal distance (radius) from the center of rotation to the load increases, the overturning moment grows, so the crane can safely lift less. That is why load charts list smaller capacities at longer radii. Capacity is not constant, and a longer radius hurts rather than helps stability. Wind is a separate factor and does not replace the radius-capacity relationship.

A two-leg bridle sling lifts a 4,000-pound load. Each leg makes a 30-degree angle with the horizontal. Using tension per leg = (load / number of legs) / sin(angle), what is the tension in EACH leg?

• a.8,000 pounds
• b.1,000 pounds
• c.2,000 pounds
• d.4,000 pounds✓

Correct: each leg carries half the load, 2,000 pounds vertically, but the sling is at 30 degrees from horizontal. Tension = (4,000 / 2) / sin(30 degrees) = 2,000 / 0.5 = 4,000 pounds per leg. So each leg actually carries as much as the entire load weight because of the shallow angle. 2,000 pounds ignores the angle multiplier; 1,000 pounds and 8,000 pounds do not match the calculation. This shows why shallow sling angles are dangerous.

A crane will operate where the boom or load could approach an overhead power line carrying less than 50 kV. What MINIMUM clearance is generally required between the equipment and the energized line?

• a.3 feet
• b.No clearance is needed if the operator is careful
• c.10 feet✓
• d.20 feet

Correct: for lines up to 50 kV, the general minimum clearance for cranes and their loads is 10 feet, increasing for higher voltages. Three feet is far too close for crane work and applies, if anything, to certain low-voltage qualified electrical tasks, not crane operation. Twenty feet is the default when the line voltage is unknown, but for a known sub-50 kV line 10 feet is the stated minimum. Operator care alone is never an acceptable substitute for the clearance.Cal/OSHA Title 8 §2946(b)(3) and Table 2 (Clearances from Energized Overhead High-Voltage Lines)

During a pre-lift inspection, which condition MOST clearly requires removing a synthetic web sling from service immediately?

• a.The sling has been used on more than one job, so its webbing has already carried loads for another contractor
• b.Light surface fuzzing of the fibers with no cuts, showing only where the webbing has rubbed against the load
• c.Melting, charring, or acid/caustic burns on the sling, or missing/illegible identification tag✓
• d.A small amount of dust on the sling body, picked up from the stockpile where the rigging is stored on site

Correct: melting, charring, chemical (acid or caustic) burns, or a missing/illegible capacity tag are all listed removal-from-service criteria because they signal lost strength or unknown rating. Light surface fuzzing without cuts or reduction of the load-bearing fibers is generally acceptable. Dust alone is not damage. Prior use on multiple jobs does not condemn a sling; its actual condition and legible tag do.

Before a mobile crane lift on soft or uneven ground, which practice BEST helps keep the crane stable while lifting?

• a.Position the load at the maximum radius to spread the weight, moving the boom out until the load hangs well away from the machine
• b.Fully extend the outriggers onto firm, level ground with adequate cribbing/pads under the floats✓
• c.Skip cribbing to let the outrigger floats sink in for grip, letting each float find its own bearing in the soft ground as it settles
• d.Retract the outriggers so the tires absorb the load, letting the suspension flex and take up the unevenness of the ground

Correct: on soft or uneven ground, fully extending the outriggers and setting them on firm, level ground with cribbing or pads that spread the load keeps the crane stable and prevents settling. Retracting outriggers to lift on tires reduces stability. Maximizing radius reduces capacity and stability. Letting floats sink in instead of cribbing invites uneven settlement and tipping. Adequate ground preparation is essential to a safe lift.

An IIPP under Title 8 must be in writing and include several required elements. Which set BEST describes those elements?

• a.Just the names of injured workers from the prior year, kept on file so the employer can show the record if an inspector asks for it during the last inspection
• b.Only a list of first-aid supplies and the nearest hospital, posted by the gang box so the crew knows where to go after an injury when someone is hurt on site
• c.A single annual safety poster and a suggestion box, refreshed once a year and emptied whenever someone drops a note into it by the office staff each month
• d.A person responsible for the program, hazard identification/inspection, hazard correction, training, communication with employees, and recordkeeping✓

Correct: a compliant IIPP names a responsible person and includes systems for identifying and evaluating hazards (inspections), correcting hazards, training employees, communicating with employees on safety, and keeping records. A first-aid list, a poster and suggestion box, or a list of injured workers are each only fragments and do not satisfy the required program elements.Cal/OSHA Title 8 CCR §3203

Which California employers are required to establish and maintain a written IIPP?

• a.Only employers with more than 50 workers, since smaller crews are covered by the general contractor's program
• b.Only employers whose workers use power tools, since hand work is treated as carrying no comparable hazard
• c.Only public agencies, not private contractors, since private work is covered by the owner's own insurer
• d.Essentially every employer with employees, including small construction firms✓

Correct: the requirement to have a written IIPP applies broadly to virtually all California employers with employees, including small construction contractors, regardless of size. There is no 50-worker minimum. Both public and private employers are covered, not just public agencies. The obligation does not depend on whether power tools are used; it is a baseline safety-program requirement for having employees.Cal/OSHA Title 8 CCR §3203

When atmospheric testing is performed before entering a permit-required confined space, in what ORDER should the atmosphere generally be tested?

• a.The order does not matter as long as all three are tested before entry by the entry supervisor
• b.Toxic gases first, then oxygen, then flammable gases and vapors last at the entry point
• c.Flammable first, then toxic contaminants, then oxygen content last before anyone enters
• d.Oxygen first, then flammable/combustible gases, then toxic contaminants✓

Correct: test oxygen first (because many combustible-gas meters need adequate oxygen to read correctly), then flammable/combustible gases and vapors, and finally toxic contaminants. Starting with toxics or flammables can give false readings if oxygen is off. The order does matter for accurate, safe results, so 'order does not matter' is incorrect.Cal/OSHA Title 8 CCR §5157

In a permit-required confined space, normal air is about 20.9 percent oxygen. Which oxygen readings define an atmosphere that is unsafe to enter without correction?

• a.Exactly 20.9 percent only, with any reading above or below that figure counted as hazardous
• b.Between 20 and 21 percent, with any reading outside that narrow band counted as hazardous
• c.Oxygen-deficient below about 19.5 percent, or oxygen-enriched above about 23.5 percent✓
• d.Anything above 18 percent is always safe, and enrichment is never treated as a hazard to anyone

Correct: an atmosphere is oxygen-deficient below about 19.5 percent (risk of impairment and asphyxiation) and oxygen-enriched above about 23.5 percent (greatly increased fire/combustion risk); both are hazardous. A 20 to 21 percent band and exactly 20.9 percent are normal but far too narrow as safety limits. 'Anything above 18 percent is safe' is wrong because 18 to 19.5 percent is already deficient and enrichment is also dangerous.Cal/OSHA Title 8 §5157(b) (Permit-Required Confined Spaces — definitions)

On a jobsite, how should portable fire extinguishers for ordinary combustibles (Class A) be positioned so workers can reach one quickly?

• a.Only near the fuel storage area, since that is the only fire risk, leaving the framed floors and the trailer without one or the trailer
• b.Locked in the site office so they are not stolen, with the superintendent holding the only key to that cabinet on site during the day
• c.One per building only, no matter how large the floor area, mounted by the main entrance where everyone can see it right by the main gate
• d.So the maximum travel distance to an extinguisher is about 75 feet, with roughly one for each 3,000 square feet of floor area✓

Correct: for Class A hazards, extinguishers are placed so the travel distance to reach one is no more than about 75 feet, commonly at least one for each 3,000 square feet of protected floor area. Locking them away defeats quick access. One per building regardless of size can exceed the travel-distance limit. Fire risk is not limited to fuel storage, so covering only that area is inadequate.