Contractor Licensing Exam Practice 100

Mississippi Residential Building Contractor Licensing Exam Practice 100 Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the minimum ceiling height required for habitable rooms in

Mississippi residential construction?

• 6 ft 6 in
• 7 ft
• 7 ft 6 in
• 8 ft

Rationale: IRC requires habitable rooms to have a minimum ceiling

height of 7 feet.

• Which type of soil has the least bearing capacity?
• Gravel
• Sand 1 / 3

• Clay
• Crushed stone

Rationale: Clay soils retain water and expand, reducing bearing

strength.

3. The primary purpose of a footing is to:

• Provide insulation
• Reduce concrete costs
• Transfer building loads to soil
• Seal basement walls

Rationale: Footings distribute structural loads to stable ground.

• What is the minimum slope for a 3-inch diameter PVC sanitary drain

line?

• 1/16 in per ft
• 1/8 in per ft
• 1/4 in per ft
• 1/2 in per ft

Rationale: Plumbing codes require 1/4 in per foot slope for 3-inch

drains.

• A GFCI is required for which location?
• Bedroom
• Bathroom
• Living room 2 / 3

• Hallway

Rationale: Bathrooms are wet zones and require GFCI protection.

• What is the typical compressive strength of standard residential

concrete?

• 1500 psi
• 2000 psi
• 3000 psi
• 4500 psi

Rationale: Residential slabs and foundations generally use 3000 psi

concrete.

7. The minimum width of a residential hallway is:

• 30 inches
• 36 inches
• 42 inches
• 48 inches

Rationale: IRC requires a minimum clear width of 36 inches.

• What is the maximum riser height for residential stairs?
• 6 inches
• 7 3/4 inches
• 8 inches
• 8 1/2 inches

Rationale: IRC maximum riser = 7 3/4 inches.

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