Building Material MCQs Part 1

Page 1 of 6

1. Di-calcium silicate (C2S)

Generates less heat of hydration

Hydrates rapidly

Hardens rapidly

Has less resisitance to sulphate attack

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

C₃A

C₃S

C₄AF

C₂S

3. Good variety of cement contains higher percentage of

None of the above

Dicalcium silicate

Tricalcium Aluminate

Tricalcium silicate

4. 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

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

Durability test

Slump test

Fineness test

Strength test

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6. The compound first to settle in cement is

Dicalcium silicate

Tera calcium alumina-ferrite

Tricalcium aluminate

Tricalcium silicate

7. The major ingredients of Portland cement are

Lime and Iron

Lime and Silica

Lime and Alumina

Silica and Alumina

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

Tricalcium aluminate

Dicalcium silicate

All of the above

Tricalcium silicate

9. Fineness test of cement gives us an estimate of

Workability of concrete

Rate of hydration

Durability of concrete

Heat of hydration

10. Gypsum is added to cement

to counteract C3A

To help C2S and C3S

to give uniform texture

to prevent cracks

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

C3A> C3S> C2S> C4AF

C3A> C4AF> C3S> C2S

C4AF>C3A > C3S> C2S

C3A> C4AF> C2S> C3S

12. The cementing property of cement is mainly due to

Silica

Gypsum

Lime

Alumina

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

modify the color of cement

increase the strength of cement

adjust setting time of cement

reduce heat of hydration of cement

14. Most important constituents of cement are

C3A and C4AF

C3S and C3A

C3A and C2S

C3S and C2S

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

Dicalcium silicate

Tricalcium aluminate

Tricalcium silicate

All of the above

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16. The soundness of cement is tested by

Vicat's apparatus

Le Chatelier's apparatus

Compression testing machine

Standard briquette test

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

None of these

Magnesia only

Free lime only

Both free lime and magnesia

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

All of the above

Tricalcium silicate and Dicalcium silicate

Dicalcium silicate and Tricalcium Aluminate

Tricalcium Aluminate and Tricalcium Aluminoferrite

19. Rapid setting cement contains relatively higher proportion of

C₄AF

C₃A

C₃S

C₂S

20. The standard consistency test is done in a

Vicat's apparatus

Vane apparatus

Blaine's apparatus

Le-chatelier's apparatus

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21. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the sound proof quality of cement

to determine the fineness

to determine the setting time

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

Fineness of cement

Compressive strengthof cement

Fineness of aggregate

Soundness of cement

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

Tricalcium Aluminate

Dicalcium silicate

Tricalcium Aluminoferrite

Tricalcium silicate

24. 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)

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

Estimate presence of free lime in cement

Adopt 0.78 times the standard considering of water

Estimate expansion potential of cement

Estimate presence of magnesia in cement

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

C₃S

C₂S

C₄AF

C₃A

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

1200 °C

1400 °C

1000 °C

1600 °C

29. 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 100 μ sieve where at least 90% (by weight) should be retained

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

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

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

Higher content of C₃S

Higher content of of C₄AF

Higher content of C₃A

Higher content of C₂S

Building Material MCQs Part 1

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