Contractor Exam Questions And

CA D12 Synthetic Products Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the primary purpose of a synthetic resin in construction

materials?

• Increase weight
• Improve durability
• Decrease elasticity
• Reduce color

Rationale: Synthetic resins are added to materials to enhance

durability, resistance to weathering, and chemical stability.

• Which of the following is a common thermosetting synthetic product

used in construction?

• Polyethylene
• Epoxy resin
• Polypropylene

D. PVC

Rationale: Epoxy resins are thermosetting plastics widely used for

adhesives, coatings, and composites.

• What is the effect of adding fillers to synthetic products?
• Increase cost only
• Improve mechanical properties and reduce cost
• Decrease strength
• Prevent curing

Rationale: Fillers can enhance strength, rigidity, or thermal stability

while reducing material cost. 1 / 3

• Which property is most critical for synthetic coatings exposed to

sunlight?

• Viscosity
• UV resistance
• Density
• Solubility

Rationale: UV resistance prevents degradation, discoloration, and loss

of mechanical properties.

5. The term "gel time" in synthetic resins refers to:

• Time taken to solidify completely
• Time before the resin starts to harden
• Time to mix with fillers
• Curing temperature

Rationale: Gel time is the working time before a resin begins to set.

6. Polyester resins are typically cured using:

• Heat only
• Peroxide initiators
• Water
• UV light exclusively

Rationale: Peroxide initiators start the polymerization process in

polyester resins.

• Which of the following is a key safety precaution when handling

synthetic resins?

• Avoid heat only
• Use gloves and ventilated areas
• Store in sunlight
• Mix with water

Rationale: Synthetic resins can emit toxic fumes and irritate skin;

protective equipment and ventilation are critical.

• What is the main advantage of using fiberglass reinforced synthetic

products?

• Lower cost
• High strength-to-weight ratio
• Magnetic properties
• Fire resistance only

Rationale: Fiberglass reinforcement significantly increases strength

while maintaining light weight. 2 / 3

9. In synthetic flooring, the term "thixotropy" refers to:

• Color stability
• Viscosity decreases under shear
• Resistance to abrasion
• Water absorption

Rationale: Thixotropic materials become less viscous when stirred or

applied, improving workability.

• Which of the following synthetic products is commonly used for

waterproofing?

• Acrylic latex
• Polyurethane
• Polyethylene sheets
• Polypropylene fibers

Rationale: Polyurethane coatings form flexible, water-resistant layers.

11. The main curing method for heat-cured synthetic products is:

• Application of heat
• UV light only
• Solvent evaporation
• Air drying

Rationale: Heat-cured products require controlled heating to complete

polymerization.

• What is the effect of adding plasticizers to synthetic products?
• Increase brittleness
• Increase flexibility
• Reduce chemical resistance
• Accelerate curing

Rationale: Plasticizers improve flexibility and reduce brittleness in

polymers.

• Which type of synthetic adhesive is preferred for bonding

metals?

• Water-based glue
• Epoxy adhesive
• Hot melt glue
• Acrylic latex

Rationale: Epoxy adhesives provide strong, durable bonds on metals.

• In synthetic product manufacturing, the term "monomer" refers

to:

• / 3