81. Which type of aggregate is commonly used for the construction of concrete blocks and pavers?
a) Crushed granite
b) River sand
c) Lightweight expanded clay
d) Recycled concrete
View Answer
Correct answer: a) Crushed granite
Explanation: Crushed granite is often used as an aggregate in the production of concrete blocks and pavers due to its strength, durability, and aesthetic appeal.
82. Which property of aggregates is important for achieving good workability in concrete?
a) Angularity
b) Absorption capacity
c) Gradation
d) Flakiness index
View Answer
Correct answer: c) Gradation
Explanation: Gradation, which refers to the distribution of particle sizes in aggregates, plays a crucial role in achieving good workability in concrete by optimizing the particle packing and ensuring a dense and cohesive mix.
83. Which type of aggregate is commonly used as a bedding material for underground utilities?
a) Pea gravel
b) Fine sand
c) Crushed limestone
d) Lightweight expanded shale
View Answer
Correct answer: a) Pea gravel
Explanation: Pea gravel, with its smooth and rounded particles, is often used as a bedding material for underground utilities to provide stability, drainage, and protection against pipe damage.
84. Which test is used to determine the particle shape and surface texture of aggregates?
a) Sieve analysis
b) Specific gravity test
c) Flakiness and elongation indextest
d) Slump test
View Answer
Correct answer: c) Flakiness and elongation index test
Explanation: The flakiness and elongation index test is conducted to evaluate the shape and surface texture of aggregates, ensuring they meet the specified requirements for a particular application.
85. Which type of aggregate is commonly used for landscaping and decorative purposes?
a) Pea gravel
b) Crushed stone
c) Natural sand
d) Lightweight expanded clay
View Answer
Correct answer: b) Crushed stone
Explanation: Crushed stone, with its diverse colors and textures, is often used for landscaping and decorative purposes, such as pathways, driveways, and garden features.
86. Which property of aggregates affects the workability of concrete and the amount of cement paste required?
a) Particle shape
b) Specific gravity
c) Porosity
d) Moisture content
View Answer
Correct answer: c) Porosity
Explanation: The porosity of aggregates influences the workability of concrete by affecting the amount of water absorbed by the aggregates, which, in turn, affects the amount of cement paste required to achieve the desired workability.
87. Which type of aggregate is commonly used as a stabilizing material for embankments and slopes?
a) Fine sand
b) Geogrid
c) Crushed stone
d) Lightweight expanded shale
View Answer
Correct answer: c) Crushed stone
Explanation: Crushed stone is frequently used as a stabilizing material for embankments and slopes due to its ability to provide structural stability, improve drainage, and prevent erosion.
88. Which test is used to evaluate the resistance of aggregates to polishing and skid resistance?
a) Specific gravity test
b) Los Angeles abrasion test
c) Aggregate impact value test
d) Micro-Deval abrasion test
View Answer
Correct answer: d) Micro-Deval abrasion test
Explanation: The Micro-Deval abrasion test assesses the resistance of aggregates to polishing and skid resistance by subjecting them to abrasion in a rotating drum with steel spheres.
89. Which type of aggregate is commonly used in the production of terrazzo flooring?
a) Crushed granite
b) Natural sand
c) Recycled concrete
d) Colored glass chips
View Answer
Correct answer: d) Colored glass chips
Explanation: Colored glass chips are often used as an aggregate in the production of terrazzo flooring to create decorative patterns and a unique visual appeal.
90. Which property of aggregates is important for achieving good bond strength between the aggregate and cement paste in concrete?
a) Surface texture
b) Moisture content
c) Specific gravity
d) Alkalinity
View Answer
Correct answer: a) Surface texture
Explanation: The surface texture of aggregates plays a crucial role in achieving good bond strength between the aggregate and cement paste in concrete by providing mechanical interlocking and increasing the surface area for adhesion.
