Building Material MCQs Part 1

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

Tricalcium silicate

Tricalcium Aluminoferrite

Dicalcium silicate

Tricalcium Aluminate

2. 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 95% ( by weight) should pass

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

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

3. Rapid setting cement contains relatively higher proportion of

C₂S

C₄AF

C₃A

C₃S

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

Tricalcium silicate

Tricalcium aluminate

Dicalcium silicate

All of the above

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

C₂S

C₄AF

C₃S

C₃A

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

All of the above

Dicalcium silicate

Tricalcium aluminate

Tricalcium silicate

7. The cementing property of cement is mainly due to

Silica

Lime

Gypsum

Alumina

8. Gypsum is added to cement

to give uniform texture

To help C2S and C3S

to prevent cracks

to counteract C3A

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

1000 °C

1600 °C

1200 °C

1400 °C

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

Soundness of cement

Compressive strengthof cement

Fineness of aggregate

Fineness of cement

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11. 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

12. The soundness of cement is tested by

Vicat's apparatus

Le Chatelier's apparatus

Standard briquette test

Compression testing machine

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

increase the strength of cement

reduce heat of hydration of cement

adjust setting time of cement

modify the color of cement

14. 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

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

All of the above

Dicalcium silicate and Tricalcium Aluminate

Tricalcium Aluminate and Tricalcium Aluminoferrite

Tricalcium silicate and Dicalcium silicate

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16. Di-calcium silicate (C2S)

Hydrates rapidly

Has less resisitance to sulphate attack

Hardens rapidly

Generates less heat of hydration

17. The compound first to settle in cement is

Tricalcium aluminate

Tera calcium alumina-ferrite

Dicalcium silicate

Tricalcium silicate

18. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the setting time

to determine the sound proof quality of cement

to determine the fineness

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

C₃A

C₄AF

C₂S

C₃S

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

Slump test

Fineness test

Durability test

Strength test

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

C3A> C3S> C2S> C4AF

C4AF>C3A > C3S> C2S

C3A> C4AF> C2S> C3S

C3A> C4AF> C3S> C2S

22. Good variety of cement contains higher percentage of

Tricalcium Aluminate

Dicalcium silicate

Tricalcium silicate

None of the above

23. The standard consistency test is done in a

Vane apparatus

Le-chatelier's apparatus

Blaine's apparatus

Vicat's apparatus

24. Most important constituents of cement are

C3A and C2S

C3A and C4AF

C3S and C3A

C3S and C2S

25. 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 :

Only (3)

Only (1)

Both (2) and (3)

Both (1) and (2)

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26. 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

27. The major ingredients of Portland cement are

Lime and Alumina

Lime and Iron

Silica and Alumina

Lime and Silica

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

0.60 P

0.80 P

0.85 P

0.65 P

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

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

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

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

None of the above

30. Fineness test of cement gives us an estimate of

Durability of concrete

Heat of hydration

Workability of concrete

Rate of hydration

Building Material MCQs Part 1

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