Construction Materials for Competitive Exam Preparation

Construction Materials

Q. What is the significance of the water-cement ratio in concrete?

A. It affects the color of the concrete
B. It influences the workability and strength
C. It determines the curing time
D. It impacts the cost of materials

Solution

The water-cement ratio is critical as it directly influences the workability, strength, and durability of the concrete.

Correct Answer: B — It influences the workability and strength

Q. Which admixture is commonly used to accelerate the setting time of concrete?

A. Retarding admixture
B. Water-reducing admixture
C. Accelerating admixture
D. Air-entraining admixture

Solution

Accelerating admixtures are used to speed up the setting time of concrete, especially in cold weather conditions.

Correct Answer: C — Accelerating admixture

Q. Which property of aggregates is crucial for ensuring good concrete performance?

A. Color
B. Shape and texture
C. Weight
D. Cost

Solution

The shape and texture of aggregates are crucial for ensuring good concrete performance, affecting bonding and workability.

Correct Answer: B — Shape and texture

Q. Which property of bricks is most important for load-bearing applications?

A. Color
B. Water absorption
C. Compressive strength
D. Size uniformity

Solution

Compressive strength is the most important property of bricks for load-bearing applications, ensuring they can support structural loads.

Correct Answer: C — Compressive strength

Q. Which property of bricks is primarily tested for quality assurance?

A. Color uniformity
B. Compressive strength
C. Thermal conductivity
D. Water absorption

Solution

Compressive strength is a primary property tested for bricks to ensure they can withstand structural loads.

Correct Answer: B — Compressive strength

Q. Which property of bricks is tested to ensure their suitability for construction?

A. Color uniformity
B. Water absorption
C. Thermal conductivity
D. Weight

Solution

Water absorption is tested in bricks to ensure they are suitable for construction, as high absorption can lead to durability issues.

Correct Answer: B — Water absorption

Q. Which property of steel is most important for its use in reinforced concrete?

A. Corrosion resistance
B. Ductility
C. Thermal conductivity
D. Color

Solution

Ductility is the most important property of steel in reinforced concrete, allowing it to deform under stress without failing.

Correct Answer: B — Ductility

Q. Which test is commonly used to determine the fineness of cement?

A. Blaine air permeability test
B. Vicat needle test
C. Le Chatelier test
D. Slump test

Solution

The Blaine air permeability test measures the fineness of cement by determining the surface area of the particles.

Correct Answer: A — Blaine air permeability test

Q. Which test is commonly used to determine the workability of concrete?

A. Slump test
B. Compression test
C. Tensile test
D. Flexural test

Solution

The slump test is commonly used to determine the workability of concrete by measuring the consistency of the mix.

Correct Answer: A — Slump test

Q. Which test is performed to determine the compressive strength of concrete?

A. Flexural test
B. Slump test
C. Cube test
D. Tensile test

Solution

The cube test is commonly performed to determine the compressive strength of concrete by measuring the load at which a concrete cube fails.

Correct Answer: C — Cube test

Q. Which test is used to determine the compressive strength of concrete?

A. Flexural test
B. Tensile test
C. Cube test
D. Impact test

Solution

The cube test is a standard method for determining the compressive strength of concrete by testing concrete cubes.

Correct Answer: C — Cube test

Q. Which test is used to determine the moisture content of aggregates?

A. Sieve analysis
B. Specific gravity test
C. Moisture content test
D. Compaction test

Solution

The moisture content test is used to determine the moisture content of aggregates, which is crucial for mix design.

Correct Answer: C — Moisture content test

Q. Which test is used to determine the soundness of cement?

A. Vicat test
B. Le Chatelier test
C. Blaine air permeability test
D. Water absorption test

Solution

The Le Chatelier test is used to determine the soundness of cement, ensuring it does not expand excessively after setting.

Correct Answer: B — Le Chatelier test

Q. Which test is used to determine the water absorption of aggregates?

A. Specific gravity test
B. Los Angeles abrasion test
C. Water absorption test
D. Sieve analysis

Solution

The water absorption test measures the porosity of aggregates, which affects the water-cement ratio in concrete.

Correct Answer: C — Water absorption test

Q. Which test is used to measure the compressive strength of concrete?

A. Slump test
B. Cube test
C. Flexural test
D. Tensile test

Solution

The cube test is commonly used to measure the compressive strength of concrete by testing concrete cubes under pressure.

Correct Answer: B — Cube test

Q. Which test is used to measure the water absorption of aggregates?

A. Los Angeles abrasion test
B. Specific gravity test
C. Water absorption test
D. Sieve analysis

Solution

The water absorption test measures the porosity of aggregates, which is crucial for understanding their performance in concrete.

Correct Answer: C — Water absorption test

Q. Which type of aggregate is preferred for high-strength concrete?

A. Coarse aggregate
B. Fine aggregate
C. Recycled aggregate
D. Lightweight aggregate

Solution

Coarse aggregates are preferred for high-strength concrete as they provide better load-bearing capacity and structural integrity.

Correct Answer: A — Coarse aggregate

Q. Which type of brick is known for its high compressive strength and low water absorption?

A. Clay brick
B. Concrete brick
C. Fly ash brick
D. Sand-lime brick

Solution

Sand-lime bricks are known for their high compressive strength and low water absorption, making them suitable for various construction applications.

Correct Answer: D — Sand-lime brick

Q. Which type of cement is commonly used for high-strength concrete?

A. Ordinary Portland Cement
B. Rapid Hardening Cement
C. Sulphate Resisting Cement
D. White Cement

Solution

Ordinary Portland Cement is commonly used for high-strength concrete due to its good compressive strength characteristics.

Correct Answer: B — Rapid Hardening Cement

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