Building Material MCQs Part 1

Page 1 of 6

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

C4AF>C3A > C3S> C2S

C3A> C3S> C2S> C4AF

C3A> C4AF> C3S> C2S

C3A> C4AF> C2S> C3S

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

increase the strength of cement

adjust setting time of cement

modify the color of cement

reduce heat of hydration of cement

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

1400 °C

1600 °C

1200 °C

1000 °C

4. 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 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 pass

5. Gypsum is added to cement

To help C2S and C3S

to counteract C3A

to give uniform texture

to prevent cracks

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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. The compound first to settle in cement is

Tera calcium alumina-ferrite

Tricalcium silicate

Dicalcium silicate

Tricalcium aluminate

8. Most important constituents of cement are

C3S and C2S

C3S and C3A

C3A and C4AF

C3A and C2S

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

None of these

Both free lime and magnesia

Magnesia only

Free lime only

10. Rapid setting cement contains relatively higher proportion of

C₃S

C₃A

C₄AF

C₂S

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11. The cementing property of cement is mainly due to

Gypsum

Lime

Silica

Alumina

12. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Hardens rapidly

Hydrates rapidly

Generates less heat of hydration

13. 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)

Only (3)

Both (2) and (3)

Only (1)

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

0.85 P

0.80 P

0.65 P

0.60 P

15. The soundness of cement is tested by

Standard briquette test

Le Chatelier's apparatus

Vicat's apparatus

Compression testing machine

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

Tricalcium silicate

Tricalcium Aluminoferrite

Tricalcium Aluminate

Dicalcium silicate

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

C₂S

C₃S

C₃A

C₄AF

18. The major ingredients of Portland cement are

Lime and Silica

Lime and Alumina

Silica and Alumina

Lime and Iron

19. Fineness test of cement gives us an estimate of

Heat of hydration

Rate of hydration

Workability of concrete

Durability of concrete

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

Durability test

Slump test

Fineness test

Strength test

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

C₂S

C₃S

C₃A

C₄AF

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

Tricalcium silicate

All of the above

Tricalcium aluminate

Dicalcium silicate

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

Tricalcium Aluminate and Tricalcium Aluminoferrite

Dicalcium silicate and Tricalcium Aluminate

Tricalcium silicate and Dicalcium silicate

All of the above

24. Good variety of cement contains higher percentage of

Dicalcium silicate

Tricalcium silicate

Tricalcium Aluminate

None of the above

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

Soundness of cement

Compressive strengthof cement

Fineness of cement

Fineness of aggregate

Page 6 of 6

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

Tricalcium aluminate

Dicalcium silicate

All of the above

Tricalcium silicate

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

Estimate presence of magnesia in cement

Estimate expansion potential of cement

Estimate presence of free lime in cement

Adopt 0.78 times the standard considering of water

28. The standard consistency test is done in a

Vane apparatus

Vicat's apparatus

Le-chatelier's apparatus

Blaine's apparatus

29. 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 presence of free lime

to determine the fineness

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

Higher content of C₃A

Higher content of C₃S

Higher content of C₂S

Higher content of of C₄AF

Building Material MCQs Part 1

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Building Material MCQs Part 1

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