CNMI Concrete / Cement Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the main binding material in concrete?
A. Sand
B. Gravel
C. Cement
D. Water
Cement reacts with water to form a paste that binds aggregates
together.
2. Which process describes cement reacting with water?
A. Oxidation
B. Carbonation
C. Hydration
D. Evaporation
Hydration is the chemical reaction between cement and water that
leads to hardening.
3. What is the purpose of aggregates in concrete?
A. Increase cost
B. Reduce durability
C. Provide strength and bulk
D. Slow curing
Aggregates make up most of the volume and provide structural
strength.
,4. Which type of cement is most commonly used?
A. Rapid hardening cement
B. Sulfate resistant cement
C. Ordinary Portland Cement
D. White cement
Ordinary Portland Cement is widely used due to its versatility.
5. What is slump test used for?
A. Strength testing
B. Durability check
C. Workability measurement
D. Density check
The slump test measures the consistency and workability of fresh
concrete.
6. What is the typical water-cement ratio for strong concrete?
A. 0.8
B. 1.0
C. 0.4 to 0.6
D. 0.9
Lower water-cement ratios produce stronger concrete.
7. What happens if too much water is added?
A. Increases strength
B. Improves durability
C. Reduces strength
D. Speeds curing
Excess water weakens the cement paste structure.
8. What is curing?
A. Mixing concrete
B. Placing concrete
C. Maintaining moisture for strength gain
D. Drying concrete quickly
Curing ensures proper hydration and strength development.
9. What is the setting time of cement?
A. Time to dry completely
B. Time to begin and finish hardening
C. Time to mix
, D. Time to transport
Setting time defines when cement paste stiffens and hardens.
10. Which aggregate size is considered fine aggregate?
A. 10 mm
B. 20 mm
C. Less than 4.75 mm
D. 50 mm
Fine aggregates are typically sand particles passing 4.75 mm sieve.
11. What is segregation in concrete?
A. Uniform mixing
B. Separation of aggregates from cement paste
C. Hardening process
D. Water absorption
Segregation reduces quality by uneven distribution of materials.
12. What is bleeding in concrete?
A. Cracking
B. Water rising to the surface
C. Cement loss
D. Air bubbles
Bleeding occurs when water separates and rises to the surface.
13. What is the function of admixtures?
A. Reduce cost
B. Change color
C. Modify properties of concrete
D. Replace cement
Admixtures enhance workability, strength, or durability.
14. Which admixture increases workability without adding water?
A. Accelerator
B. Retarder
C. Plasticizer
D. Air entrainer
Plasticizers improve flow without increasing water content.
15. What is compressive strength measured in?
A. Kg
B. Liters
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the main binding material in concrete?
A. Sand
B. Gravel
C. Cement
D. Water
Cement reacts with water to form a paste that binds aggregates
together.
2. Which process describes cement reacting with water?
A. Oxidation
B. Carbonation
C. Hydration
D. Evaporation
Hydration is the chemical reaction between cement and water that
leads to hardening.
3. What is the purpose of aggregates in concrete?
A. Increase cost
B. Reduce durability
C. Provide strength and bulk
D. Slow curing
Aggregates make up most of the volume and provide structural
strength.
,4. Which type of cement is most commonly used?
A. Rapid hardening cement
B. Sulfate resistant cement
C. Ordinary Portland Cement
D. White cement
Ordinary Portland Cement is widely used due to its versatility.
5. What is slump test used for?
A. Strength testing
B. Durability check
C. Workability measurement
D. Density check
The slump test measures the consistency and workability of fresh
concrete.
6. What is the typical water-cement ratio for strong concrete?
A. 0.8
B. 1.0
C. 0.4 to 0.6
D. 0.9
Lower water-cement ratios produce stronger concrete.
7. What happens if too much water is added?
A. Increases strength
B. Improves durability
C. Reduces strength
D. Speeds curing
Excess water weakens the cement paste structure.
8. What is curing?
A. Mixing concrete
B. Placing concrete
C. Maintaining moisture for strength gain
D. Drying concrete quickly
Curing ensures proper hydration and strength development.
9. What is the setting time of cement?
A. Time to dry completely
B. Time to begin and finish hardening
C. Time to mix
, D. Time to transport
Setting time defines when cement paste stiffens and hardens.
10. Which aggregate size is considered fine aggregate?
A. 10 mm
B. 20 mm
C. Less than 4.75 mm
D. 50 mm
Fine aggregates are typically sand particles passing 4.75 mm sieve.
11. What is segregation in concrete?
A. Uniform mixing
B. Separation of aggregates from cement paste
C. Hardening process
D. Water absorption
Segregation reduces quality by uneven distribution of materials.
12. What is bleeding in concrete?
A. Cracking
B. Water rising to the surface
C. Cement loss
D. Air bubbles
Bleeding occurs when water separates and rises to the surface.
13. What is the function of admixtures?
A. Reduce cost
B. Change color
C. Modify properties of concrete
D. Replace cement
Admixtures enhance workability, strength, or durability.
14. Which admixture increases workability without adding water?
A. Accelerator
B. Retarder
C. Plasticizer
D. Air entrainer
Plasticizers improve flow without increasing water content.
15. What is compressive strength measured in?
A. Kg
B. Liters
