# Basic Civil Engineering Questions and Answers –  Fine Aggregates

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This set of Basic Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Fine Aggregates”.

1. Fine Aggregates should pass through which IS sieve?
a) 2.35mm
b) 45µ
c) 4.75mm
d) 75µ

Explanation: 4.75mm IS sieve is the aggregate size deciding sieve. Anything retained on sieve is coarse aggregate and the ones that pass through sieve are fine aggregates.

2. How many types of fine aggregates are there based on source?
a) 3
b) 2
c) 4
d) 6

Explanation: Three types are natural sand (river banks), crushed stone sand (hard stone) and crushed gravel sand (gravel).

3. What is the fineness modulus value of a fine sand?
a) <2.2
b) 2.2-2.6
c) <1
d) 1-2

Explanation: Based on the fineness of sand, there are very fine sand, fine sand, medium sand, coarse sand and very coarse sand. Fine sand has fineness modulus between 2.2-2.6.
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4. M-Sand has ___________ type of particle shape.
a) Flaky
b) Round
c) Angular
d) Cubical

Explanation: The stone is crushed to obtain M-Sand. The shape of the crushed stone is cubical and it has rounded edges.

5. Which of the below can be used as fine aggregates?
a) Lime
b) Splinters
c) Surkhi
d) Rice Husk

Explanation: Surkhi consists of broken brick pieces. They can be ground to the size of fine aggregates.
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6. The specific gravity for sand is:
a) 2.6
b) 2.65
c) 2.8
d) 2.75

Explanation: As per the results from specific gravity test in pycnometer, this specific gravity for sand is 2.6.

7. In the ratio 1:4:8, which number indicates the quantity of fine aggregates?
a) 1
b) 4
c) 8
d) None

Explanation: For plain cement concrete (PCC), ratio 1:4:8 is usually used. The ratio is of cement: fine aggregates: coarse aggregates. Hence, 4 is the quantity of fine aggregates.

8. PGBS stands for:
a) Perfectly Graded Blast furnace Slag
b) Pre-Grinded Blast furnace Slag
c) Poly Granule Blast furnace Slag
d) Processed Granulated Blast furnace Slag

Explanation: It is obtained by processing the waste by-product from the iron industry. It is now being used as an alternative to river sand.

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