250+ TOP MCQs on Factors Causing Variation in the Quality of Concrete and Answers

Concrete Technology MCQs on “Factors Causing Variation in the Quality of Concrete”.

1. Generally what is the w/c ratio?
a) .25
b) .5
c) .75
d) 1
Answer: b
Clarification: Generally the water cement ratio is .42-.5 and if it exceeds it will create pores in concrete.

2. Silica fume is _________
a) Less reactive
b) Neutral
c) More reactive
d) Absent in concrete
Answer: c
Clarification: One of the most beneficial uses for silica fume is in concrete, because of its both properties, it is a very reactive pozzolana.

3. Content of SiO₂ in silica fume?
a) 52%
b) 35%
c) 21.9%
d) 85-97%
Answer: d
Clarification: The content of SiO₂ in silica fume is 85-97%. 35% is the content of SiO₂ in Calcareous (ASTM C618 Class C) Fly Ash.

4. What is the content of Al₂O₃ in fly ash?
a) 30-60%
b) 15-30%
c) Up to 30%
d) 1-7%
Answer: b
Clarification: The content of Al₂O₃ in fly ash has been tested according to procedures specified in IS: 1727-1967.

5. The property of a material that resists penetration or indentation by means of abrasion or scratching is known as ____________
a) Strength
b) Hardness
c) Stiffness
d) Toughness
Answer: b
Clarification: The property of a material that resists penetration or indentation by means of abrasion or scratching is known as hardness.

6. During compression test of cast iron, the failure occurs i.e. the crack appears along the __________
a) Diagonal
b) Surface parallel to load applied
c) Surface perpendicular to load applied
d) Lateral
Answer: a
Clarification: The failure occurs i.e. the crack appears along the diagonal during the compression test of cast iron.

7. It opens the area of improvement for quality construction rationally based on the documents from ___________ projects.
a) Previous
b) Next
c) Later
d) Future
Answer: a
Clarification: It opens the area of improvement for quality construction rationally based on the documents from previous projects.

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