This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Aggregates”
1. According to geological origin, aggregates is/are classified into __________ types.
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: There are 2 types of aggregates based on geological origin. They are natural aggregates and artificial aggregates.
2. According to size, aggregates is/are classified into __________ types.
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: There are 4 types of aggregates based on size. They are fine aggregates, coarse aggregates, all in aggregates and single size aggregates.
3. What is the total percentage of aggregates in concrete by volume?
a) 50-60%
b) 60-75%
c) 85%
d) 50%
View Answer
Explanation: Aggregates, which account for 60-75% of the total volume of concrete, are divided into 2 categories.
4. What is the size of fine aggregates?
a) 4.75mm
b) < 4.75mm
c) > 4.75mm
d) 12mm
View Answer
Explanation: The size of the fine aggregates is less than 4.75mm because it passes from 4.75 mm sieve at its lowest so there is no chance for more than 4.75mm in its size.
5. What is the size of coarse aggregates?
a) 4.75mm
b) < 4.75mm
c) > 4.75mm
d) 12mm
View Answer
Explanation: The size of the fine aggregates is less than 4.75mm because it passes from 4.75 mm sieve but the aggregates which don’t pass through it are coarse aggregates.
6. Crushed stone, gravel and ordinary sand are examples of ___________
a) Lightweight aggregate
b) Normal-weight aggregate
c) Heavy-weight aggregate
d) Both Normal-weight aggregate and Heavy-weight aggregate
View Answer
Explanation: Crushed stone, gravel and ordinary sand are examples of normal weight aggregate. They are commonly used in manufacture of normal weight concrete, asphalt concrete and roadway sub-base.
7. Which type of aggregate is shown below?
a) Angular aggregate
b) Rounded aggregate
c) Flaky aggregate
d) Irregular or partially aggregate
View Answer
Explanation: Possessing well defined edges formed at the intersection of roughly planar faces.
8. Which type of aggregate is shown below?
a) Angular aggregate
b) Rounded aggregate
c) Flaky aggregate
d) Irregular or partially aggregate
View Answer
Explanation: Material usually angular of which the thickness is small relative to the width.
9. Which type of aggregate is shown below?
a) Angular aggregate
b) Rounded aggregate
c) Flaky aggregate
d) Irregular or partially aggregate
View Answer
Explanation: Fully water worm or completely shaped by attrition. These are generally found in river or sea shore.
10. Aggregate crushed before the application of full load of ___________
a) 10ton
b) 20ton
c) 30ton
d) 40ton
View Answer
Explanation: Aggregate crushed before the application of full load of 40ton, the weaker material become compacted, so that the amount of crushing in later stage of the test is reduced.
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