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Building Materials
0

Building Material MCQs Part 1

December 9, 2019

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17%

Page 1 of 6

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

Estimate presence of free lime in cement

Adopt 0.78 times the standard considering of water

Estimate presence of magnesia in cement

Estimate expansion potential of cement

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2. Most important constituents of cement are

C3A and C4AF

C3S and C2S

C3A and C2S

C3S and C3A

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

Free lime only

Magnesia only

None of these

Both free lime and magnesia

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4. 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

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

Fineness of cement

Compressive strengthof cement

Fineness of aggregate

Soundness of cement

Page 2 of 6

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6. 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)

Both (1) and (2)

Both (2) and (3)

Only (1)

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7. Good variety of cement contains higher percentage of

Dicalcium silicate

Tricalcium silicate

Tricalcium Aluminate

None of the above

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8. Gypsum is added to cement

to give uniform texture

to counteract C3A

To help C2S and C3S

to prevent cracks

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

0.85 P

0.80 P

0.60 P

0.65 P

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10. Fineness test of cement gives us an estimate of

Durability of concrete

Workability of concrete

Heat of hydration

Rate of hydration

Page 3 of 6

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11. Rapid setting cement contains relatively higher proportion of

C₄AF

C₃A

C₂S

C₃S

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

C3A> C3S> C2S> C4AF

C3A> C4AF> C2S> C3S

C3A> C4AF> C3S> C2S

C4AF>C3A > C3S> C2S

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

C₄AF

C₂S

C₃A

C₃S

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

1400 °C

1600 °C

1200 °C

1000 °C

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

Durability test

Strength test

Slump test

Fineness test

Page 4 of 6

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

Higher content of C₂S

Higher content of of C₄AF

Higher content of C₃S

Higher content of C₃A

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

Tricalcium Aluminate and Tricalcium Aluminoferrite

Dicalcium silicate and Tricalcium Aluminate

Tricalcium silicate and Dicalcium silicate

All of the above

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

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

None of the above

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

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

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

All of the above

Tricalcium aluminate

Dicalcium silicate

Tricalcium silicate

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

Tricalcium silicate

Tricalcium Aluminate

Tricalcium Aluminoferrite

Dicalcium silicate

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

C₃A

C₄AF

C₂S

C₃S

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22. The compound first to settle in cement is

Tera calcium alumina-ferrite

Dicalcium silicate

Tricalcium aluminate

Tricalcium silicate

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23. The cementing property of cement is mainly due to

Gypsum

Lime

Alumina

Silica

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24. Di-calcium silicate (C2S)

Hardens rapidly

Hydrates rapidly

Has less resisitance to sulphate attack

Generates less heat of hydration

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25. 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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26. The standard consistency test is done in a

Blaine's apparatus

Vicat's apparatus

Vane apparatus

Le-chatelier's apparatus

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27. The purpose of the soundness test of cement is

to determine the setting time

to determine the sound proof quality of cement

to determine the fineness

to determine the presence of free lime

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

Dicalcium silicate

All of the above

Tricalcium silicate

Tricalcium aluminate

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29. The major ingredients of Portland cement are

Silica and Alumina

Lime and Alumina

Lime and Silica

Lime and Iron

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30. The soundness of cement is tested by

Vicat's apparatus

Le Chatelier's apparatus

Compression testing machine

Standard briquette test

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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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