Properties of Concrete and Steel
Q. What is the effect of adding superplasticizers to concrete?
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A.
Increases setting time
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B.
Reduces water content while maintaining workability
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C.
Increases the weight of concrete
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D.
Decreases compressive strength
Solution
Superplasticizers reduce water content while maintaining workability, allowing for stronger concrete.
Correct Answer: B — Reduces water content while maintaining workability
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Q. What is the main function of fly ash when used as a cement replacement?
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A.
To increase the density of concrete
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B.
To improve workability and reduce permeability
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C.
To enhance the color of concrete
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D.
To decrease the setting time
Solution
Fly ash improves workability and reduces permeability when used as a cement replacement.
Correct Answer: B — To improve workability and reduce permeability
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Q. What is the primary advantage of using high-strength steel in construction?
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A.
Lower cost
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B.
Reduced weight of structures
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C.
Easier fabrication
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D.
Better corrosion resistance
Solution
High-strength steel allows for reduced weight of structures, leading to more efficient designs.
Correct Answer: B — Reduced weight of structures
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Q. What is the typical water-cement ratio for achieving high-strength concrete?
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A.
0.5
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B.
0.3
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C.
0.7
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D.
0.4
Solution
A water-cement ratio of 0.3 is typically used to achieve high-strength concrete.
Correct Answer: B — 0.3
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Q. Which property of concrete is primarily affected by the curing process?
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A.
Compressive strength
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B.
Flexural strength
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C.
Durability
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D.
Workability
Solution
The curing process significantly affects the compressive strength of concrete by ensuring proper hydration.
Correct Answer: A — Compressive strength
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Q. Which property of steel is measured by its yield strength?
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A.
Resistance to deformation
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B.
Resistance to corrosion
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C.
Ductility
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D.
Thermal conductivity
Solution
Yield strength measures the resistance of steel to deformation under stress.
Correct Answer: A — Resistance to deformation
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Q. Which property of steel is primarily responsible for its high tensile strength?
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A.
Ductility
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B.
Elasticity
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C.
Hardness
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D.
Malleability
Solution
Ductility allows steel to deform under tensile stress, contributing to its high tensile strength.
Correct Answer: A — Ductility
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