Oncrete Qualification Module Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary binding material in concrete?
A. Sand
B. Gravel
C. Cement
D. Water
Answer: C. Cement
Rationale: Cement acts as the binder that holds all concrete
ingredients together when hydrated.
2. What is the function of water in concrete?
A. To weaken mix
B. To start hydration process
C. To replace cement
D. To act as aggregate
Answer: B. To start hydration process
, Rationale: Water reacts with cement in hydration, allowing concrete
to harden and gain strength.
3. Which component provides strength and bulk in concrete?
A. Cement
B. Water
C. Aggregates
D. Admixtures
Answer: C. Aggregates
Rationale: Aggregates (sand and gravel) form the main structural
body of concrete.
4. What is the typical water-cement ratio importance?
A. Controls color
B. Controls strength and workability
C. Controls weight only
D. Controls curing time only
Answer: B. Controls strength and workability
Rationale: Lower water-cement ratio increases strength but reduces
workability.
5. What is concrete curing?
A. Mixing process
B. Transportation process
C. Maintaining moisture for hydration
D. Crushing hardened concrete
, Answer: C. Maintaining moisture for hydration
Rationale: Curing ensures proper hydration, improving strength and
durability.
6. What happens if too much water is added to concrete?
A. Increased strength
B. Decreased strength
C. Faster curing
D. No effect
Answer: B. Decreased strength
Rationale: Excess water increases porosity, weakening hardened
concrete.
7. What is the purpose of admixtures?
A. Replace cement
B. Improve or modify properties
C. Reduce aggregates
D. Eliminate curing
Answer: B. Improve or modify properties
Rationale: Admixtures adjust setting time, strength, or workability.
8. Which test measures concrete workability?
A. Slump test
B. Compression test
C. Tensile test
D. Sieve test
, Answer: A. Slump test
Rationale: Slump test evaluates consistency and workability of fresh
concrete.
9. What is the main purpose of reinforcement in concrete?
A. Reduce cost
B. Increase tensile strength
C. Increase weight
D. Reduce curing time
Answer: B. Increase tensile strength
Rationale: Steel reinforcement resists tensile forces that concrete
alone cannot handle.
10. Concrete is strongest in which type of stress?
A. Tension
B. Shear
C. Compression
D. Bending only
Answer: C. Compression
Rationale: Concrete has high compressive strength but low tensile
strength.
11. What is segregation in concrete?
A. Hardening process
B. Separation of mix components
C. Mixing improvement
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary binding material in concrete?
A. Sand
B. Gravel
C. Cement
D. Water
Answer: C. Cement
Rationale: Cement acts as the binder that holds all concrete
ingredients together when hydrated.
2. What is the function of water in concrete?
A. To weaken mix
B. To start hydration process
C. To replace cement
D. To act as aggregate
Answer: B. To start hydration process
, Rationale: Water reacts with cement in hydration, allowing concrete
to harden and gain strength.
3. Which component provides strength and bulk in concrete?
A. Cement
B. Water
C. Aggregates
D. Admixtures
Answer: C. Aggregates
Rationale: Aggregates (sand and gravel) form the main structural
body of concrete.
4. What is the typical water-cement ratio importance?
A. Controls color
B. Controls strength and workability
C. Controls weight only
D. Controls curing time only
Answer: B. Controls strength and workability
Rationale: Lower water-cement ratio increases strength but reduces
workability.
5. What is concrete curing?
A. Mixing process
B. Transportation process
C. Maintaining moisture for hydration
D. Crushing hardened concrete
, Answer: C. Maintaining moisture for hydration
Rationale: Curing ensures proper hydration, improving strength and
durability.
6. What happens if too much water is added to concrete?
A. Increased strength
B. Decreased strength
C. Faster curing
D. No effect
Answer: B. Decreased strength
Rationale: Excess water increases porosity, weakening hardened
concrete.
7. What is the purpose of admixtures?
A. Replace cement
B. Improve or modify properties
C. Reduce aggregates
D. Eliminate curing
Answer: B. Improve or modify properties
Rationale: Admixtures adjust setting time, strength, or workability.
8. Which test measures concrete workability?
A. Slump test
B. Compression test
C. Tensile test
D. Sieve test
, Answer: A. Slump test
Rationale: Slump test evaluates consistency and workability of fresh
concrete.
9. What is the main purpose of reinforcement in concrete?
A. Reduce cost
B. Increase tensile strength
C. Increase weight
D. Reduce curing time
Answer: B. Increase tensile strength
Rationale: Steel reinforcement resists tensile forces that concrete
alone cannot handle.
10. Concrete is strongest in which type of stress?
A. Tension
B. Shear
C. Compression
D. Bending only
Answer: C. Compression
Rationale: Concrete has high compressive strength but low tensile
strength.
11. What is segregation in concrete?
A. Hardening process
B. Separation of mix components
C. Mixing improvement
