Building Material MCQs Part 1

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

1200 °C

1400 °C

1000 °C

1600 °C

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

None of the above

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

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

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

3. Most important constituents of cement are

C3S and C3A

C3A and C2S

C3S and C2S

C3A and C4AF

4. Rapid setting cement contains relatively higher proportion of

C₄AF

C₂S

C₃S

C₃A

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

Fineness of cement

Soundness of cement

Fineness of aggregate

Compressive strengthof cement

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6. 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

0.65 P

0.85 P

7. Fineness test of cement gives us an estimate of

Heat of hydration

Durability of concrete

Rate of hydration

Workability of concrete

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

C₂S

C₃A

C₄AF

C₃S

9. The purpose of the soundness test of cement is

to determine the sound proof quality of cement

to determine the setting time

to determine the presence of free lime

to determine the fineness

10. The cementing property of cement is mainly due to

Alumina

Lime

Silica

Gypsum

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

Durability test

Slump test

Fineness test

Strength test

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

increase the strength of cement

adjust setting time of cement

reduce heat of hydration of cement

modify the color of cement

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

Dicalcium silicate and Tricalcium Aluminate

All of the above

Tricalcium Aluminate and Tricalcium Aluminoferrite

Tricalcium silicate and Dicalcium silicate

14. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Hardens rapidly

Hydrates rapidly

Generates less heat of hydration

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

C₂S

C₃S

C₃A

C₄AF

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

None of these

Free lime only

Magnesia only

Both free lime and magnesia

17. 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 90 μ sieve where at least 95% ( by weight) should pass

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

18. The major ingredients of Portland cement are

Lime and Silica

Silica and Alumina

Lime and Alumina

Lime and Iron

19. 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 presence of magnesia in cement

Estimate expansion potential of cement

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

Tricalcium silicate

Tricalcium Aluminoferrite

Tricalcium Aluminate

Dicalcium silicate

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21. The standard consistency test is done in a

Le-chatelier's apparatus

Blaine's apparatus

Vane apparatus

Vicat's apparatus

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

Higher content of C₃A

Higher content of C₂S

Higher content of C₃S

Higher content of of C₄AF

23. Good variety of cement contains higher percentage of

Dicalcium silicate

Tricalcium Aluminate

Tricalcium silicate

None of the above

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

Tricalcium silicate

All of the above

Dicalcium silicate

Tricalcium aluminate

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

Dicalcium silicate

Tricalcium aluminate

All of the above

Tricalcium silicate

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

C3A> C4AF> C3S> C2S

C4AF>C3A > C3S> C2S

C3A> C4AF> C2S> C3S

C3A> C3S> C2S> C4AF

27. The compound first to settle in cement is

Tricalcium aluminate

Tera calcium alumina-ferrite

Dicalcium silicate

Tricalcium silicate

28. The soundness of cement is tested by

Compression testing machine

Vicat's apparatus

Le Chatelier's apparatus

Standard briquette test

29. 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 (3)

Only (1)

30. Gypsum is added to cement

to give uniform texture

to prevent cracks

to counteract C3A

To help C2S and C3S

Building Material MCQs Part 1

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