Building Material MCQs Part 1

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

Dicalcium silicate

Tricalcium silicate

Tricalcium Aluminoferrite

Tricalcium Aluminate

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

Dicalcium silicate and Tricalcium Aluminate

Tricalcium silicate and Dicalcium silicate

All of the above

Tricalcium Aluminate and Tricalcium Aluminoferrite

3. Di-calcium silicate (C2S)

Hydrates rapidly

Hardens rapidly

Has less resisitance to sulphate attack

Generates less heat of hydration

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

Tricalcium aluminate

Tricalcium silicate

Dicalcium silicate

All of the above

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

reduce heat of hydration of cement

adjust setting time of cement

modify the color of cement

increase the strength of cement

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6. 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

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

IS 100 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 90% (by weight) should pass

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

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

None of the above

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

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

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

9. Gypsum is added to cement

to counteract C3A

to prevent cracks

to give uniform texture

To help C2S and C3S

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

1000 °C

1600 °C

1200 °C

1400 °C

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11. The compound first to settle in cement is

Tera calcium alumina-ferrite

Tricalcium aluminate

Tricalcium silicate

Dicalcium silicate

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

C₂S

C₃A

C₃S

C₄AF

13. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the fineness

to determine the setting time

to determine the sound proof quality of cement

14. Fineness test of cement gives us an estimate of

Heat of hydration

Durability of concrete

Rate of hydration

Workability of concrete

15. The cementing property of cement is mainly due to

Gypsum

Silica

Lime

Alumina

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16. Most important constituents of cement are

C3S and C3A

C3A and C4AF

C3S and C2S

C3A and C2S

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

C₄AF

C₃A

C₂S

C₃S

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

All of the above

Dicalcium silicate

Tricalcium aluminate

Tricalcium silicate

19. Good variety of cement contains higher percentage of

Tricalcium silicate

Dicalcium silicate

Tricalcium Aluminate

None of the above

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

Soundness of cement

Fineness of cement

Compressive strengthof cement

Fineness of aggregate

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21. 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 C₃S

Higher content of C₂S

22. Rapid setting cement contains relatively higher proportion of

C₃A

C₃S

C₂S

C₄AF

23. The soundness of cement is tested by

Standard briquette test

Le Chatelier's apparatus

Vicat's apparatus

Compression testing machine

24. The major ingredients of Portland cement are

Lime and Silica

Lime and Iron

Lime and Alumina

Silica and Alumina

25. 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

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

0.60 P

0.65 P

0.85 P

0.80 P

27. 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 (1)

Only (3)

28. The standard consistency test is done in a

Vane apparatus

Vicat's apparatus

Blaine's apparatus

Le-chatelier's apparatus

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

Adopt 0.78 times the standard considering of water

Estimate presence of magnesia in cement

Estimate expansion potential of cement

Estimate presence of free lime in cement

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

Strength test

Slump test

Durability test

Fineness test

Building Material MCQs Part 1

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