Building Material MCQs Part 1

Page 1 of 6

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

C₄AF

C₃A

C₂S

C₃S

2. The standard consistency test is done in a

Vicat's apparatus

Blaine's apparatus

Vane apparatus

Le-chatelier's apparatus

3. 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

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

All of the above

Tricalcium Aluminate and Tricalcium Aluminoferrite

Dicalcium silicate and Tricalcium Aluminate

Tricalcium silicate and Dicalcium silicate

5. Fineness test of cement gives us an estimate of

Heat of hydration

Durability of concrete

Rate of hydration

Workability of concrete

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

Tricalcium silicate

Tricalcium aluminate

All of the above

Dicalcium silicate

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

Higher content of C₂S

Higher content of C₃S

Higher content of of C₄AF

Higher content of C₃A

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

C₃S

C₃A

C₂S

C₄AF

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

Fineness of cement

Fineness of aggregate

Compressive strengthof cement

Soundness of cement

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

Tricalcium silicate

Tricalcium aluminate

All of the above

Dicalcium silicate

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11. Most important constituents of cement are

C3S and C2S

C3S and C3A

C3A and C2S

C3A and C4AF

12. 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> C3S> C2S> C4AF

C3A> C4AF> C2S> C3S

13. 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 (3)

Only (1)

Both (2) and (3)

14. Gypsum is added to cement

to give uniform texture

to counteract C3A

To help C2S and C3S

to prevent cracks

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

Slump test

Strength test

Fineness test

Durability test

Page 4 of 6

16. The compound first to settle in cement is

Tera calcium alumina-ferrite

Tricalcium aluminate

Tricalcium silicate

Dicalcium silicate

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

increase the strength of cement

reduce heat of hydration of cement

modify the color of cement

adjust setting time of cement

18. Di-calcium silicate (C2S)

Hydrates rapidly

Hardens rapidly

Generates less heat of hydration

Has less resisitance to sulphate attack

19. 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 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

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

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

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21. Good variety of cement contains higher percentage of

Tricalcium Aluminate

Tricalcium silicate

Dicalcium silicate

None of the above

22. The cementing property of cement is mainly due to

Silica

Lime

Gypsum

Alumina

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

Tricalcium Aluminate

Dicalcium silicate

Tricalcium Aluminoferrite

Tricalcium silicate

24. The major ingredients of Portland cement are

Lime and Iron

Silica and Alumina

Lime and Silica

Lime and Alumina

25. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the setting time

to determine the fineness

to determine the sound proof quality of cement

Page 6 of 6

26. Rapid setting cement contains relatively higher proportion of

C₄AF

C₂S

C₃A

C₃S

27. The soundness of cement is tested by

Le Chatelier's apparatus

Vicat's apparatus

Compression testing machine

Standard briquette test

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

1400 °C

1000 °C

1600 °C

1200 °C

29. 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

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

Estimate presence of free lime in cement

Estimate presence of magnesia in cement

Estimate expansion potential of cement

Adopt 0.78 times the standard considering of water

Building Material MCQs Part 1

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