91. Which type of aggregate is commonly used in the production of asphalt shingles for roofing?
a) Crushed limestone
b) Fine sand
c) Ceramic granules
d) Lightweight expanded clay
View Answer
Correct answer: c) Ceramic granules
Explanation: Ceramic granules are commonly used as an aggregate in the production of asphalt shingles for roofing to provide protection against UV radiation, improve fire resistance, and enhance aesthetics.
92. Which test is used to determine the angularity and texture of fine aggregates?
a) Sieve analysis
b) Flakiness and elongation index test
c) Sand equivalent test
d) Specific gravity test
View Answer
Correct answer: c) Sand equivalent test
Explanation: The sand equivalent test evaluates the angularity and texture of fine aggregates by comparing their sand equivalent value with a standard reference, indicating their suitability for use in asphalt or concrete mixtures.
93. Which type of aggregate is commonly used for the construction of sports fields and playgrounds?
a) Fine sand
b) Rubber granules
c) Crushed stone
d) Lightweight expanded clay
View Answer
Correct answer: b) Rubber granules
Explanation: Rubber granules, made from recycled tires, are often used as an aggregate in the construction of sports fields and playgrounds due to their shock-absorbing properties and ability to reduce injuries from falls.
94. What is the significance of the specific gravity test for aggregates?
a) Determines the water absorption capacity
b) Determines the mechanical strength
c) Determines the particle shape and texture
d) Determines the void content
View Answer
Correct answer: a) Determines the water absorption capacity
Explanation: The specific gravity test is conducted to determine the water absorption capacity of aggregates, which is important for proportioning concrete mixtures and assessing their potential effect on concrete properties.
95. Which type of aggregate is commonly used for the construction of railway ballast?
a) Crushed limestone
b) River sand
c) Recycled concrete
d) Gravel
View Answer
Correct answer: d) Gravel
Explanation: Gravel, typically in the form of crushed stone, is commonly used as an aggregate for railway ballast to provide stability, drainage, and resistance to track movement.
96. Which test is used to determine the organic impurities in fine aggregates?
a) Specific gravity test
b) Sand equivalent test
c) Los Angeles abrasion test
d) Organic impurity test
View Answer
Correct answer: d) Organic impurity test
Explanation: The organic impurity test is conducted to determine the presence of organic compounds in fine aggregates, which can have detrimental effects on the strength and durability of concrete.
97. Which type of aggregate is commonly used for the construction of concrete masonry units (CMUs)?
a) Crushed granite
b) River sand
c) Lightweight expanded clay
d) Recycled concrete
View Answer
Correct answer: d) Recycled concrete
Explanation: Recycled concrete, obtained from crushing old concrete structures, is commonly used as an aggregate in the production of concrete masonry units (CMUs) due to its availability and sustainability.
98. Which property of aggregates is important for achieving good workability in shotcrete applications?
a) Absorption capacity
b) Specific gravity
c) Particle shape
d) Gradation
View Answer
Correct answer: c) Particle shape
Explanation: The shape of aggregates is critical for achieving good workability in shotcrete applications, as it influences the ability of the material to flow, adhere to surfaces, and maintain cohesion during application.
99. Which type of aggregate is commonly used in the production of concrete roof tiles?
a) Crushed granite
b) River sand
c) Lightweight expanded clay
d) Crushed quartz
View Answer
Correct answer: a) Crushed granite
Explanation: Crushed granite is often used as an aggregate in the production of concrete roof tiles due to its strength, durability, and resistance to weathering.
100. Which test is used to evaluate the resistance of aggregates to polishing and skid resistance under wet conditions?
a) Sand equivalent test
b) Los Angeles abrasion test
c) Micro-Deval abrasion test
d) Alkali-silica reactivity test
View Answer
Correct answer: c) Micro-Deval abrasion test
Explanation: The Micro-Deval abrasion test is specifically designed to assess the resistance of aggregates to polishing and skid resistance under wet conditions, simulating the effects of traffic and environmental factors.
