Drywall Installer Practice Exam Questions and
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the standard thickness of drywall used for residential
walls?
a) 1/4 inch
b) 1/2 inch
c) 3/4 inch
d) 5/8 inch
Rationale: The standard thickness for residential interior walls is 1/2
inch. Thicker 5/8-inch drywall is typically used for ceilings or fire-rated
assemblies.
2. What tool is commonly used to cut drywall?
a) Circular saw
b) Hammer
c) Utility knife
d) Chisel
,Rationale: Drywall is scored with a utility knife and then snapped
along the score line. Circular saws may be used in some cases but can
generate excess dust.
3. Which type of drywall is moisture-resistant?
a) Standard drywall
b) Green board
c) Type X drywall
d) Regular gypsum board
Rationale: Green board has a water-resistant facing and is designed
for areas with moderate moisture, such as bathrooms.
4. What is the purpose of corner bead in drywall installation?
a) To secure sheets to studs
b) To protect and reinforce corners
c) To hide seams
d) To finish ceiling joints
Rationale: Corner beads provide a straight, durable edge at outside
corners, preventing damage and providing a clean, professional finish.
5. What is the main ingredient in drywall panels?
a) Cement
b) Wood pulp
, c) Gypsum
d) Plaster
Rationale: Drywall is primarily made of gypsum, a soft mineral that is
sandwiched between paper facings.
6. Which type of drywall is fire-rated?
a) Green board
b) Standard drywall
c) Type X drywall
d) Paperless drywall
Rationale: Type X drywall contains glass fibers and other additives to
improve fire resistance, often required by building codes in certain
assemblies.
7. What is the recommended screw spacing for attaching 1/2-inch
drywall to wall studs?
a) 8 inches
b) 16 inches
c) 12 inches
d) 24 inches
Rationale: Screws should be placed approximately 16 inches apart on
walls to provide secure fastening and prevent sagging.
, 8. What is the first step in preparing a drywall surface for finishing?
a) Apply primer
b) Sand the surface
c) Tape seams
d) Paint
Rationale: Seams must be taped and joint compound applied before
sanding and painting to ensure a smooth, continuous surface.
9. Which joint compound is best for embedding tape?
a) Setting-type compound
b) All-purpose joint compound
c) Lightweight spackle
d) Texture compound
Rationale: All-purpose joint compound is suitable for embedding tape,
topping, and finishing joints.
10. What is the correct method for hanging drywall sheets on a
ceiling?
a) Lay them on the floor and lift individually
b) Screw along the edges only
c) Start perpendicular to framing and screw every 12 inches
along supports
d) Hang parallel to studs
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. What is the standard thickness of drywall used for residential
walls?
a) 1/4 inch
b) 1/2 inch
c) 3/4 inch
d) 5/8 inch
Rationale: The standard thickness for residential interior walls is 1/2
inch. Thicker 5/8-inch drywall is typically used for ceilings or fire-rated
assemblies.
2. What tool is commonly used to cut drywall?
a) Circular saw
b) Hammer
c) Utility knife
d) Chisel
,Rationale: Drywall is scored with a utility knife and then snapped
along the score line. Circular saws may be used in some cases but can
generate excess dust.
3. Which type of drywall is moisture-resistant?
a) Standard drywall
b) Green board
c) Type X drywall
d) Regular gypsum board
Rationale: Green board has a water-resistant facing and is designed
for areas with moderate moisture, such as bathrooms.
4. What is the purpose of corner bead in drywall installation?
a) To secure sheets to studs
b) To protect and reinforce corners
c) To hide seams
d) To finish ceiling joints
Rationale: Corner beads provide a straight, durable edge at outside
corners, preventing damage and providing a clean, professional finish.
5. What is the main ingredient in drywall panels?
a) Cement
b) Wood pulp
, c) Gypsum
d) Plaster
Rationale: Drywall is primarily made of gypsum, a soft mineral that is
sandwiched between paper facings.
6. Which type of drywall is fire-rated?
a) Green board
b) Standard drywall
c) Type X drywall
d) Paperless drywall
Rationale: Type X drywall contains glass fibers and other additives to
improve fire resistance, often required by building codes in certain
assemblies.
7. What is the recommended screw spacing for attaching 1/2-inch
drywall to wall studs?
a) 8 inches
b) 16 inches
c) 12 inches
d) 24 inches
Rationale: Screws should be placed approximately 16 inches apart on
walls to provide secure fastening and prevent sagging.
, 8. What is the first step in preparing a drywall surface for finishing?
a) Apply primer
b) Sand the surface
c) Tape seams
d) Paint
Rationale: Seams must be taped and joint compound applied before
sanding and painting to ensure a smooth, continuous surface.
9. Which joint compound is best for embedding tape?
a) Setting-type compound
b) All-purpose joint compound
c) Lightweight spackle
d) Texture compound
Rationale: All-purpose joint compound is suitable for embedding tape,
topping, and finishing joints.
10. What is the correct method for hanging drywall sheets on a
ceiling?
a) Lay them on the floor and lift individually
b) Screw along the edges only
c) Start perpendicular to framing and screw every 12 inches
along supports
d) Hang parallel to studs
