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Building Materials
0

Building Material MCQs Part 1

December 9, 2019

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Page 1 of 6

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

Fineness test

Slump test

Durability test

Strength test

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

C₃S

C₃A

C₂S

C₄AF

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

Magnesia only

Both free lime and magnesia

None of these

Free lime only

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

Tricalcium silicate

All of the above

Tricalcium aluminate

Dicalcium silicate

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5. The compound first to settle in cement is

Tricalcium aluminate

Tera calcium alumina-ferrite

Tricalcium silicate

Dicalcium silicate

Page 2 of 6

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6. The major ingredients of Portland cement are

Lime and Alumina

Silica and Alumina

Lime and Iron

Lime and Silica

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

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

None of the above

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

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

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

0.65 P

0.85 P

0.80 P

0.60 P

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9. Most important constituents of cement are

C3A and C2S

C3S and C3A

C3A and C4AF

C3S and C2S

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10. Rapid setting cement contains relatively higher proportion of

C₂S

C₃S

C₄AF

C₃A

Page 3 of 6

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

C₃A

C₃S

C₂S

C₄AF

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12. The cementing property of cement is mainly due to

Gypsum

Lime

Alumina

Silica

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

Tricalcium Aluminoferrite

Tricalcium Aluminate

Tricalcium silicate

Dicalcium silicate

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

1000 °C

1200 °C

1400 °C

1600 °C

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15. 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

Page 4 of 6

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16. 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

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17. The soundness of cement is tested by

Compression testing machine

Standard briquette test

Le Chatelier's apparatus

Vicat's apparatus

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18. Good variety of cement contains higher percentage of

None of the above

Tricalcium silicate

Tricalcium Aluminate

Dicalcium silicate

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19. The purpose of the soundness test of cement is

to determine the setting time

to determine the fineness

to determine the sound proof quality of cement

to determine the presence of free lime

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20. 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 100 μ sieve where at least 90% (by weight) should be retained

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

Page 5 of 6

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21. Di-calcium silicate (C2S)

Has less resisitance to sulphate attack

Hydrates rapidly

Hardens rapidly

Generates less heat of hydration

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22. Fineness test of cement gives us an estimate of

Workability of concrete

Rate of hydration

Heat of hydration

Durability of concrete

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23. Gypsum is added to cement

To help C2S and C3S

to prevent cracks

to give uniform texture

to counteract C3A

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

Higher content of C₃A

Higher content of of C₄AF

Higher content of C₂S

Higher content of C₃S

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

Dicalcium silicate

Tricalcium silicate

All of the above

Tricalcium aluminate

Page 6 of 6

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26. 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)

Both (2) and (3)

Only (1)

Only (3)

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

Tricalcium Aluminate and Tricalcium Aluminoferrite

Dicalcium silicate and Tricalcium Aluminate

All of the above

Tricalcium silicate and Dicalcium silicate

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28. The standard consistency test is done in a

Le-chatelier's apparatus

Vicat's apparatus

Vane apparatus

Blaine's apparatus

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

adjust setting time of cement

increase the strength of cement

modify the color of cement

reduce heat of hydration of cement

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

Soundness of cement

Fineness of aggregate

Compressive strengthof cement

Fineness of cement

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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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