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Building Materials
0

Building Material MCQs Part 1

December 9, 2019

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1. 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> C3S> C2S> C4AF

C3A> C4AF> C2S> C3S

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2. The soundness of cement is tested by

Vicat's apparatus

Compression testing machine

Standard briquette test

Le Chatelier's apparatus

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3. The compound first to settle in cement is

Tera calcium alumina-ferrite

Dicalcium silicate

Tricalcium aluminate

Tricalcium silicate

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

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

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

None of the above

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

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

C₄AF

C₂S

C₃S

C₃A

Page 2 of 6

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6. 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

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

Higher content of C₃S

Higher content of C₂S

Higher content of of C₄AF

Higher content of C₃A

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

Tricalcium Aluminate and Tricalcium Aluminoferrite

Tricalcium silicate and Dicalcium silicate

All of the above

Dicalcium silicate and Tricalcium Aluminate

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

modify the color of cement

increase the strength of cement

adjust setting time of cement

reduce heat of hydration of cement

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

Free lime only

Both free lime and magnesia

None of these

Magnesia only

Page 3 of 6

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11. The purpose of the soundness test of cement is

to determine the presence of free lime

to determine the sound proof quality of cement

to determine the setting time

to determine the fineness

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

Tricalcium Aluminate

Dicalcium silicate

Tricalcium Aluminoferrite

Tricalcium silicate

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13. Fineness test of cement gives us an estimate of

Workability of concrete

Rate of hydration

Durability of concrete

Heat of hydration

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14. Gypsum is added to cement

to give uniform texture

to prevent cracks

To help C2S and C3S

to counteract C3A

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15. 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 (1) and (2)

Both (2) and (3)

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

Slump test

Strength test

Durability test

Fineness test

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17. 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 100 μ sieve where at least 90% ( by weight) should pass

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

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18. The cementing property of cement is mainly due to

Gypsum

Alumina

Lime

Silica

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19. Di-calcium silicate (C2S)

Hardens rapidly

Has less resisitance to sulphate attack

Hydrates rapidly

Generates less heat of hydration

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

1400 °C

1600 °C

1000 °C

1200 °C

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21. Most important constituents of cement are

C3S and C3A

C3S and C2S

C3A and C4AF

C3A and C2S

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

All of the above

Dicalcium silicate

Tricalcium silicate

Tricalcium aluminate

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23. Good variety of cement contains higher percentage of

Tricalcium silicate

None of the above

Dicalcium silicate

Tricalcium Aluminate

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24. Rapid setting cement contains relatively higher proportion of

C₄AF

C₃A

C₂S

C₃S

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

C₃S

C₂S

C₃A

C₄AF

Page 6 of 6

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26. The major ingredients of Portland cement are

Lime and Alumina

Lime and Iron

Lime and Silica

Silica and Alumina

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

0.60 P

0.65 P

0.85 P

0.80 P

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

Tricalcium aluminate

All of the above

Tricalcium silicate

Dicalcium silicate

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

Compressive strengthof cement

Soundness of cement

Fineness of cement

Fineness of aggregate

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30. The standard consistency test is done in a

Vane apparatus

Blaine's apparatus

Vicat's apparatus

Le-chatelier's apparatus

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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