DC Glass Installer Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of using safety glazing in
hazardous locations such as doors, sidelites, and low-level windows?
A. To increase glass thickness for decoration
B. To prevent glass from breaking under any circumstances
C. To reduce the risk of serious injury when glass breaks
D. To improve the color appearance of the glass
Answer: C
Safety glazing is designed to reduce injuries by breaking into safer pieces or
remaining attached to a protective layer when impacted, especially in
areas where human contact is likely.
2. Before installing a glass panel into a frame, what is the most important
measurement to verify?
A. The weight of the installation tools
B. The opening dimensions and glass clearance requirements
C. The manufacturer’s office location
D. The color of the surrounding wall material
Answer: B
,Accurate opening measurements and proper clearance ensure that the
glass fits correctly without stress that could lead to cracking or failure.
3. What tool is commonly used by glass installers to create a clean score
line before breaking sheet glass?
A. Glass cutter
B. Pipe wrench
C. Circular saw
D. Chisel
Answer: A
A glass cutter uses a hardened wheel to score the surface of the glass,
allowing controlled breaking along the intended line.
4. Why should glass edges be properly finished after cutting?
A. To make the glass heavier
B. To eliminate sharp edges and reduce stress points
C. To prevent the glass from becoming transparent
D. To change the glass thickness
Answer: B
Finished edges reduce the possibility of cuts and help prevent cracks caused
by edge damage or concentrated stresses.
5. Which material is commonly used as a flexible setting block under glass
panels?
A. Wood scraps
B. Rubber or neoprene blocks
C. Steel plates
D. Concrete pieces
Answer: B
,Rubber and neoprene setting blocks support the glass while allowing
movement and preventing direct contact between glass and hard framing
materials.
6. What is the main purpose of glazing sealant around installed glass?
A. To increase the weight of the window
B. To provide weather protection and secure the glass
C. To make glass opaque
D. To replace the frame structure
Answer: B
Glazing sealants create a weather-resistant barrier and help hold glass
securely within the glazing system.
7. When handling large glass sheets, the safest practice is to:
A. Carry them flat against the ground
B. Handle them with proper lifting equipment and protective gear
C. Hold them only by one corner
D. Remove all protective equipment for better movement
Answer: B
Large glass panels require proper handling techniques, suction cups, lifting
devices, and personal protective equipment to prevent injury and damage.
8. What type of glass is commonly used in storefront systems because of its
strength and safety characteristics?
A. Annealed glass only
B. Tempered glass
C. Crystal glass
D. Decorative mirror glass
Answer: B
, Tempered glass is frequently used in storefront applications because it is
stronger than annealed glass and breaks into smaller, less dangerous
fragments.
9. What should a glass installer do before applying sealant to a surface?
A. Wet the surface with oil
B. Clean and prepare the surface according to manufacturer requirements
C. Apply paint first
D. Scratch the surface deeply
Answer: B
Proper surface preparation improves sealant adhesion and prevents
premature failure of the glazing system.
10. Which personal protective equipment is essential when cutting or
handling glass?
A. Safety glasses and cut-resistant gloves
B. Sandals and loose clothing
C. Earphones only
D. Cotton gloves only
Answer: A
Eye protection and cut-resistant gloves help prevent injuries from glass
fragments and sharp edges.
11. What is the purpose of glazing beads in a window system?
A. To decorate the glass
B. To hold the glass securely within the frame
C. To increase glass transparency
D. To replace sealant completely
Answer: B
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of using safety glazing in
hazardous locations such as doors, sidelites, and low-level windows?
A. To increase glass thickness for decoration
B. To prevent glass from breaking under any circumstances
C. To reduce the risk of serious injury when glass breaks
D. To improve the color appearance of the glass
Answer: C
Safety glazing is designed to reduce injuries by breaking into safer pieces or
remaining attached to a protective layer when impacted, especially in
areas where human contact is likely.
2. Before installing a glass panel into a frame, what is the most important
measurement to verify?
A. The weight of the installation tools
B. The opening dimensions and glass clearance requirements
C. The manufacturer’s office location
D. The color of the surrounding wall material
Answer: B
,Accurate opening measurements and proper clearance ensure that the
glass fits correctly without stress that could lead to cracking or failure.
3. What tool is commonly used by glass installers to create a clean score
line before breaking sheet glass?
A. Glass cutter
B. Pipe wrench
C. Circular saw
D. Chisel
Answer: A
A glass cutter uses a hardened wheel to score the surface of the glass,
allowing controlled breaking along the intended line.
4. Why should glass edges be properly finished after cutting?
A. To make the glass heavier
B. To eliminate sharp edges and reduce stress points
C. To prevent the glass from becoming transparent
D. To change the glass thickness
Answer: B
Finished edges reduce the possibility of cuts and help prevent cracks caused
by edge damage or concentrated stresses.
5. Which material is commonly used as a flexible setting block under glass
panels?
A. Wood scraps
B. Rubber or neoprene blocks
C. Steel plates
D. Concrete pieces
Answer: B
,Rubber and neoprene setting blocks support the glass while allowing
movement and preventing direct contact between glass and hard framing
materials.
6. What is the main purpose of glazing sealant around installed glass?
A. To increase the weight of the window
B. To provide weather protection and secure the glass
C. To make glass opaque
D. To replace the frame structure
Answer: B
Glazing sealants create a weather-resistant barrier and help hold glass
securely within the glazing system.
7. When handling large glass sheets, the safest practice is to:
A. Carry them flat against the ground
B. Handle them with proper lifting equipment and protective gear
C. Hold them only by one corner
D. Remove all protective equipment for better movement
Answer: B
Large glass panels require proper handling techniques, suction cups, lifting
devices, and personal protective equipment to prevent injury and damage.
8. What type of glass is commonly used in storefront systems because of its
strength and safety characteristics?
A. Annealed glass only
B. Tempered glass
C. Crystal glass
D. Decorative mirror glass
Answer: B
, Tempered glass is frequently used in storefront applications because it is
stronger than annealed glass and breaks into smaller, less dangerous
fragments.
9. What should a glass installer do before applying sealant to a surface?
A. Wet the surface with oil
B. Clean and prepare the surface according to manufacturer requirements
C. Apply paint first
D. Scratch the surface deeply
Answer: B
Proper surface preparation improves sealant adhesion and prevents
premature failure of the glazing system.
10. Which personal protective equipment is essential when cutting or
handling glass?
A. Safety glasses and cut-resistant gloves
B. Sandals and loose clothing
C. Earphones only
D. Cotton gloves only
Answer: A
Eye protection and cut-resistant gloves help prevent injuries from glass
fragments and sharp edges.
11. What is the purpose of glazing beads in a window system?
A. To decorate the glass
B. To hold the glass securely within the frame
C. To increase glass transparency
D. To replace sealant completely
Answer: B
