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The NM-GB98 exam has 50 questions and runs 8 hours 55 minutes.
These 10 free NM-GB98 questions are organized by exam domain, so you can see how each part of the New Mexico GB-98 General Building Contractor Exam blueprint is tested. Reveal the answer and explanation under each question.
A residential footing subgrade must reach at least 95% of a specified Proctor maximum dry density. The laboratory maximum is 124 pcf, and a field test reports 116 pcf dry density. The lift looks firm and shows no rutting. What is the proper disposition?
Correct answer: C - Correct and retest the lift; 116 divided by 124 is about 93.5%, below the 95% criterion
A below-grade commercial wall will be exposed to hydrostatic pressure from a seasonal high water table. Which wall-protection approach is appropriate?
Correct answer: C - Waterproofing, foundation drainage, and structural provisions for water pressure
Finishers are preparing to power-trowel a slab while a sheen of bleed water remains on the surface. What should the superintendent direct?
Correct answer: A - Wait until the bleed water is gone before final finishing
A concrete mix has a specified compressive strength f'c of 4,000 psi. Three consecutive strength tests are 3,450, 4,400, and 4,400 psi. Under ACI 318 acceptance criteria, which conclusion is correct?
Correct answer: B - The criteria fail because 3,450 psi is more than 500 psi below f'c
Water enters a newly built brick-veneer wall after wind-driven rain. The base flashing and weep openings are present, but mortar droppings form continuous bridges from the veneer to the sheathing. Which repair addresses the failure mechanism?
Correct answer: D - Remove the mortar bridges and restore a clear cavity path so water reaches the flashing and weeps
A New Mexico dwelling stair is detailed with a largest riser of 7-7/8 inches, a smallest tread of 9-1/4 inches, 1/4-inch maximum variation within the flight, and 36-1/2 inches of clear width. Which plan-review comment is supported by these dimensions?
Correct answer: B - No correction; these dimensions meet New Mexico residential stair limits
On a 3:12 asphalt-shingle roof, the roofer proposes one underlayment layer and plans to place the underlayment beneath the drip edge at both eaves and rakes. Which revision is correct?
Correct answer: B - Use two layers; place them over the eave drip edge and beneath the rake drip edge
A fixed pane beside a corridor has 8.5 square feet of exposed glass. Its bottom edge is 12 inches above the floor, its top edge is 50 inches above the floor, and the walking surface is 24 inches away. The pane is not in a door, stair, ramp, or wet-area location. How should the large-pane safety-glazing trigger be applied?
Correct answer: D - Not under this trigger; the pane area is below 9 square feet
An architectural floor plan gives a framed opening as 8'-0", while the enlarged detail gives 7'-8". Both are written dimensions, and fabrication has not begun. What should the contractor do first?
Correct answer: A - Submit an RFI and obtain written clarification before framing the affected opening
A trench is 4 feet 6 inches deep. A competent person finds no indication of a cave-in hazard, but the only ladder is 40 feet laterally from the crew's work point. What correction is required before entry?
Correct answer: C - Add or relocate a ladder so lateral travel is no more than 25 feet
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