Building Material MCQs Part 1

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1. Which of the following compounds affects the ultimate strength of cement?

Tricalcium Aluminate

Tricalcium Aluminoferrite

Tricalcium silicate

Dicalcium silicate

2. The major ingredients of Portland cement are

Lime and Alumina

Lime and Silica

Silica and Alumina

Lime and Iron

3. Le-Chatelier's method can be used to determine

Fineness of cement

Compressive strengthof cement

Fineness of aggregate

Soundness of cement

4. Good variety of cement contains higher percentage of

Dicalcium silicate

Tricalcium silicate

Tricalcium Aluminate

None of the above

5. The soundness test of cement by Le-chatelier's apparatus give unsoundness due to

Magnesia only

None of these

Free lime only

Both free lime and magnesia

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6. High percentage of C3S and low percentage of C2S cement will result in

Rapid hardening
High early strength and heat generation
More resistance to chemical attack

The correct answer is :

Both (2) and (3)

Both (1) and (2)

Only (1)

Only (3)

7. Which of the following shows the correct decreasing order of rate of hydration of Portland cement compounds?

C3A> C4AF> C2S> C3S

C3A> C4AF> C3S> C2S

C4AF>C3A > C3S> C2S

C3A> C3S> C2S> C4AF

8. Gypsum is added to cement

to counteract C3A

to give uniform texture

To help C2S and C3S

to prevent cracks

9. Compound of cement which reacts immediately with water and sets first

Tricalcium silicate

All of the above

Tricalcium aluminate

Dicalcium silicate

10. The compound first to settle in cement is

Tricalcium silicate

Tera calcium alumina-ferrite

Tricalcium aluminate

Dicalcium silicate

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11. During the manufacturing of Portland cement, gypsum/plaster of paris is added to

modify the color of cement

increase the strength of cement

reduce heat of hydration of cement

adjust setting time of cement

12. The cementing property of cement is mainly due to

Gypsum

Silica

Alumina

Lime

13. Find the wrong statement: In Le-Chatelier's apparatus we:

Estimate expansion potential of cement

Estimate presence of free lime in cement

Adopt 0.78 times the standard considering of water

Estimate presence of magnesia in cement

14. Which of the following Bouge's compound of cement liberates maximum heat of hydration?

C₃S

C₃A

C₄AF

C₂S

15. The mixture of different ingredients of cement is burnt at

1200 °C

1400 °C

1600 °C

1000 °C

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16. The increased rate of strength gain of rapid hardening cement is achieved by

Higher content of C₃A

Higher content of of C₄AF

Higher content of C₂S

Higher content of C₃S

17. For the manufacture of Portland cement, the proportions of raw materials used are

Lime 70%, silica 20%, and other 10%

Lime 63%, silica 22%, and other 15%

Lime 40%, silica 40%, and other 20%

None of the above

18. Hydration of cement is due to chemical action of water with

Tricalcium silicate and Dicalcium silicate

All of the above

Dicalcium silicate and Tricalcium Aluminate

Tricalcium Aluminate and Tricalcium Aluminoferrite

19. The constituent of cement which is responsible for initial setting time of cement is

Tricalcium aluminate

Dicalcium silicate

All of the above

Tricalcium silicate

20. The amount of water used in performing setting time test of cement is (assuming P= standard consistency of cement)

0.60 P

0.85 P

0.65 P

0.80 P

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21. Di-calcium silicate (C2S)

Hydrates rapidly

Has less resisitance to sulphate attack

Generates less heat of hydration

Hardens rapidly

22. Rapid setting cement contains relatively higher proportion of

C₃A

C₄AF

C₂S

C₃S

23. In ordinary Portland cement, the first one to react with water is

C₃S

C₃A

C₂S

C₄AF

24. In which of the following tests cement air permeability method is used?

Slump test

Strength test

Fineness test

Durability test

25. Most important constituents of cement are

C3A and C2S

C3A and C4AF

C3S and C3A

C3S and C2S

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26. The standard consistency test is done in a

Vicat's apparatus

Blaine's apparatus

Vane apparatus

Le-chatelier's apparatus

27. The purpose of the soundness test of cement is

to determine the sound proof quality of cement

to determine the presence of free lime

to determine the fineness

to determine the setting time

28. The soundness of cement is tested by

Compression testing machine

Le Chatelier's apparatus

Vicat's apparatus

Standard briquette test

29. As a cheap alternative, the fineness of cement is tested by using

IS 100 μ sieve where at least 90% (by weight) should be retained

IS 100 μ sieve where at least 90% ( by weight) should pass

IS 90 μ sieve where at least 90% (by weight) should pass

IS 90 μ sieve where at least 95% ( by weight) should pass

30. Fineness test of cement gives us an estimate of

Heat of hydration

Workability of concrete

Durability of concrete

Rate of hydration

Building Material MCQs Part 1

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