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Building Materials MCQ Questions & Answers | Civil Engineering

Learn Building Materials MCQ questions & answers are available for a Civil Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Building Materials MCQ question is the important chapter for a Civil Engineering and GATE students. Page-6 section-2

Each section contains 100 MCQs on Building Materials .
51
A good brick earth should contain:
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
52
For preparing porcelains, the clay should be
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
53
Bessemer process is used for the manufacture of
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
54
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
55
Bullet proof glass is made of thick glass sheet sandwiched by a layer of
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
56
Good quality cement contains higher percentage of
Discuss
Answer & Solution
Answer: Option A
Solution:
Option A: Tri-calcium silicate (C3S) - This is the most important compound in cement.
It's responsible for the early strength development (within the first week).
A higher percentage of C3S means faster setting and hardening, which is generally desired in good quality cement.

Option B: Di-calcium silicate (C2S) - This contributes to strength gain over a longer period (after the first week).
While important, it's not the primary factor determining early strength and overall cement quality as much as C3S.

Option C: Tri-calcium aluminate (C3A) - This contributes to very early hydration and heat generation.
A high percentage of C3A can lead to flash set and reduced durability, especially in sulfate-rich environments.
Good quality cement generally has a controlled amount of C3A, not a higher percentage.

Option D: Tetra calcium alumino ferrite (C4AF) - This reduces the clinkering temperature during cement production.
It has minimal contribution to the strength of cement.

Therefore, the correct answer is: Option A: Tri-calcium silicate, as it contributes to faster setting and hardening and higher early strength of the cement.
57
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
58
The most commonly used synthetic abrasive is
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
59
The main constituent which imparts hydraulicity to hydraulic lime is
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
60
Sandstone is a
(i) Sedimentary rock
(ii) Aqueous rock
(iii) Siliceous rock
Discuss
Answer & Solution
Answer: Option C
Solution:
Correct Answer: Option C: Both (i) and (iii)

(i) Sedimentary rock – ✅ Correct
Sandstone is definitely a sedimentary rock.
It forms through the compaction and cementation of sand-sized mineral particles over time, often in layers.

(ii) Aqueous rock – ❌ Not a standard classification
While sandstone forms in environments involving water (like rivers, lakes, or oceans), the term “aqueous rock” is not a formal geological classification.
In geology, rocks are usually grouped as igneous, sedimentary, or metamorphic.
“Aqueous” may be used descriptively, but not as a standalone rock type.

(iii) Siliceous rock – ✅ Correct
Sandstone is primarily composed of quartz, which is silicon dioxide (SiO₂).
This makes sandstone a siliceous rock due to its high silica content.

Final Conclusion:
Sandstone is a sedimentary and siliceous rock, but not formally an aqueous rock.
Therefore, the correct answer is Option C: Both (i) and (iii).