Building Material MCQs Part 1

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1. Rapid setting cement contains relatively higher proportion of

C₂S

C₄AF

C₃S

C₃A

2. 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%

None of the above

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

3. 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)

Only (1)

Both (1) and (2)

Only (3)

4. The standard consistency test is done in a

Vane apparatus

Le-chatelier's apparatus

Blaine's apparatus

Vicat's apparatus

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

1600 °C

1000 °C

1400 °C

1200 °C

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

Magnesia only

None of these

Both free lime and magnesia

Free lime only

7. 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

C3A> C4AF> C2S> C3S

C4AF>C3A > C3S> C2S

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

C₃S

C₂S

C₃A

C₄AF

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

All of the above

Tricalcium aluminate

Dicalcium silicate

Tricalcium silicate

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

All of the above

Tricalcium aluminate

Dicalcium silicate

Tricalcium silicate

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11. Most important constituents of cement are

C3S and C3A

C3A and C4AF

C3A and C2S

C3S and C2S

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

Estimate presence of magnesia in cement

Adopt 0.78 times the standard considering of water

Estimate expansion potential of cement

Estimate presence of free lime in cement

13. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Hydrates rapidly

Hardens rapidly

Generates less heat of hydration

14. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the fineness

to determine the sound proof quality of cement

to determine the setting time

15. Gypsum is added to cement

to counteract C3A

to give uniform texture

to prevent cracks

To help C2S and C3S

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16. The soundness of cement is tested by

Le Chatelier's apparatus

Compression testing machine

Vicat's apparatus

Standard briquette test

17. The compound first to settle in cement is

Dicalcium silicate

Tera calcium alumina-ferrite

Tricalcium aluminate

Tricalcium silicate

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

Tricalcium Aluminoferrite

Tricalcium silicate

Tricalcium Aluminate

Dicalcium silicate

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

0.80 P

0.65 P

0.85 P

0.60 P

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

Higher content of C₂S

Higher content of C₃A

Higher content of C₃S

Higher content of of C₄AF

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

modify the color of cement

adjust setting time of cement

reduce heat of hydration of cement

increase the strength of cement

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

Fineness of cement

Soundness of cement

Fineness of aggregate

Compressive strengthof cement

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

Slump test

Durability test

Strength test

Fineness test

24. 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 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 be retained

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

C₄AF

C₃A

C₂S

C₃S

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26. 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

27. The major ingredients of Portland cement are

Lime and Alumina

Lime and Silica

Silica and Alumina

Lime and Iron

28. Fineness test of cement gives us an estimate of

Workability of concrete

Durability of concrete

Heat of hydration

Rate of hydration

29. The cementing property of cement is mainly due to

Lime

Alumina

Gypsum

Silica

30. Good variety of cement contains higher percentage of

Tricalcium Aluminate

None of the above

Dicalcium silicate

Tricalcium silicate

Building Material MCQs Part 1

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Building Material MCQs Part 1

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