Building Material MCQs Part 1

Page 1 of 6

1. The cementing property of cement is mainly due to

Alumina

Lime

Silica

Gypsum

2. Fineness test of cement gives us an estimate of

Durability of concrete

Workability of concrete

Rate of hydration

Heat of hydration

3. 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

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

Slump test

Strength test

Fineness test

Durability test

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

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

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

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

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

Higher content of of C₄AF

Higher content of C₃S

Higher content of C₂S

Higher content of C₃A

7. The purpose of the soundness test of cement is

to determine the fineness

to determine the sound proof quality of cement

to determine the setting time

to determine the presence of free lime

8. Most important constituents of cement are

C3A and C2S

C3S and C2S

C3S and C3A

C3A and C4AF

9. The compound first to settle in cement is

Tricalcium aluminate

Tera calcium alumina-ferrite

Tricalcium silicate

Dicalcium silicate

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

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

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

None of the above

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

Page 3 of 6

11. The major ingredients of Portland cement are

Lime and Alumina

Silica and Alumina

Lime and Silica

Lime and Iron

12. Good variety of cement contains higher percentage of

None of the above

Tricalcium silicate

Dicalcium silicate

Tricalcium Aluminate

13. Gypsum is added to cement

to give uniform texture

to counteract C3A

to prevent cracks

To help C2S and C3S

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

Tricalcium silicate and Dicalcium silicate

Tricalcium Aluminate and Tricalcium Aluminoferrite

Dicalcium silicate and Tricalcium Aluminate

All of the above

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

C4AF>C3A > C3S> C2S

C3A> C4AF> C3S> C2S

C3A> C4AF> C2S> C3S

C3A> C3S> C2S> C4AF

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

Tricalcium Aluminate

Tricalcium Aluminoferrite

Dicalcium silicate

Tricalcium silicate

17. The standard consistency test is done in a

Vicat's apparatus

Vane apparatus

Le-chatelier's apparatus

Blaine's apparatus

18. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Hardens rapidly

Hydrates rapidly

Generates less heat of hydration

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

0.85 P

0.60 P

0.65 P

0.80 P

20. The soundness of cement is tested by

Compression testing machine

Le Chatelier's apparatus

Vicat's apparatus

Standard briquette test

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

Compressive strengthof cement

Fineness of aggregate

Soundness of cement

Fineness of cement

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

C₃A

C₄AF

C₂S

C₃S

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

Dicalcium silicate

All of the above

Tricalcium silicate

Tricalcium aluminate

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

1000 °C

1400 °C

1600 °C

1200 °C

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

C₃A

C₂S

C₃S

C₄AF

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

Adopt 0.78 times the standard considering of water

Estimate expansion potential of cement

Estimate presence of magnesia in cement

Estimate presence of free lime in cement

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

Both free lime and magnesia

None of these

Magnesia only

Free lime only

28. 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 (1)

Only (3)

Both (2) and (3)

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

Tricalcium silicate

Tricalcium aluminate

Dicalcium silicate

All of the above

30. Rapid setting cement contains relatively higher proportion of

C₄AF

C₃A

C₃S

C₂S

Building Material MCQs Part 1

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