Building Material MCQs Part 1

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1. The compound first to settle in cement is

Dicalcium silicate

Tricalcium aluminate

Tera calcium alumina-ferrite

Tricalcium silicate

2. Most important constituents of cement are

C3A and C4AF

C3S and C3A

C3S and C2S

C3A and C2S

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

Slump test

Fineness test

Durability test

Strength test

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

All of the above

Tricalcium aluminate

Dicalcium silicate

Tricalcium silicate

5. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Generates less heat of hydration

Hydrates rapidly

Hardens rapidly

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

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

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

None of the above

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

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

Estimate presence of magnesia in cement

Adopt 0.78 times the standard considering of water

Estimate expansion potential of cement

Estimate presence of free lime in cement

8. Rapid setting cement contains relatively higher proportion of

C₃A

C₄AF

C₃S

C₂S

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

0.85 P

0.60 P

0.65 P

0.80 P

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

Tricalcium Aluminate and Tricalcium Aluminoferrite

All of the above

Dicalcium silicate and Tricalcium Aluminate

Tricalcium silicate and Dicalcium silicate

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11. The cementing property of cement is mainly due to

Alumina

Silica

Lime

Gypsum

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

Tricalcium aluminate

Tricalcium silicate

All of the above

Dicalcium silicate

13. The standard consistency test is done in a

Blaine's apparatus

Le-chatelier's apparatus

Vicat's apparatus

Vane apparatus

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

Higher content of C₂S

Higher content of C₃A

Higher content of C₃S

Higher content of of C₄AF

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

C₂S

C₃A

C₃S

C₄AF

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16. The major ingredients of Portland cement are

Lime and Iron

Lime and Silica

Silica and Alumina

Lime and Alumina

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

1200 °C

1600 °C

1000 °C

1400 °C

18. 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 (1) and (2)

Both (2) and (3)

Only (3)

Only (1)

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

adjust setting time of cement

modify the color of cement

increase the strength of cement

reduce heat of hydration of cement

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

Free lime only

Both free lime and magnesia

Magnesia only

None of these

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21. The soundness of cement is tested by

Standard briquette test

Vicat's apparatus

Le Chatelier's apparatus

Compression testing machine

22. The purpose of the soundness test of cement is

to determine the setting time

to determine the sound proof quality of cement

to determine the fineness

to determine the presence of free lime

23. Gypsum is added to cement

to give uniform texture

to prevent cracks

To help C2S and C3S

to counteract C3A

24. Fineness test of cement gives us an estimate of

Heat of hydration

Durability of concrete

Workability of concrete

Rate of hydration

25. Good variety of cement contains higher percentage of

Tricalcium Aluminate

Tricalcium silicate

Dicalcium silicate

None of the above

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26. 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

C3A> C3S> C2S> C4AF

C4AF>C3A > C3S> C2S

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

C₄AF

C₃A

C₃S

C₂S

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

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

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

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

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

Tricalcium Aluminoferrite

Tricalcium silicate

Tricalcium Aluminate

Dicalcium silicate

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

Soundness of cement

Fineness of cement

Compressive strengthof cement

Fineness of aggregate

Building Material MCQs Part 1

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