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Concrete Technology Mcqs

Q:

Plastic shrinkage cracking occurs in ________ hours after placing.

A) .5 B) 24
C) 10 D) 5
 
Answer & Explanation Answer: D) 5

Explanation: Plastic shrinkage concrete occurs within 1 hours and 8 hours after placing, when subjected to a very rapid loss of moisture.

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44
Q:

Is it possible to have 0% crack in our building?

A) Yes B) No
C) May be D) Can’t be determined
 
Answer & Explanation Answer: B) No

Explanation: It is not possible to have 0 % cracks in any building after construction. We can prevent it but we can’t stop it.

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73
Q:

Which can be the possible option for cracking in the building?

A) Due to light load B) Low w/c ratio
C) Temperature difference D) Gain of water
 
Answer & Explanation Answer: C) Temperature difference

Explanation: Concrete expands and shrinks when the temperature changes which directly leads to cracking in the building.

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Q:

What is the maximum w/c ratio?

A) .2 B) .3
C) .4 D) .5
 
Answer & Explanation Answer: D) .5

Explanation: Water cement ratio should not exceed .5 in concreting because it will reduces the workability of the concrete.

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49
Q:

How can we prevent cracks in concrete structures?

A) Due to heavy load B) Low w/c ratio
C) Settlement of structure D) High water cement ratio
 
Answer & Explanation Answer: B) Low w/c ratio

Explanation: Low w/c ratio will directly affect the quality of concrete. A lower water cement ratio leads to high strength in concrete therefore lesser cracks.

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Q:

Creep is ____ to the strength of concrete.

A) Equal B) Similar
C) Directly proportional D) Inversely proportional
 
Answer & Explanation Answer: D) Inversely proportional

Explanation: Creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete.

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67
Q:

At the construction stage, binding wires ____________

A) Should touch the formwork B) Should not touch the formwork
C) To be turned outside D) To be turned whole structure
 
Answer & Explanation Answer: B) Should not touch the formwork

Explanation: Binding wires to be turned inside (should not touch formwork). G.I. wires to be used in aggressive environment.

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66
Q:

Powder epoxy is fusion bonded to bar at about _________0C temperature.

A) 100 B) 250
C) 300 D) 350
 
Answer & Explanation Answer: B) 250

Explanation: Fusion bonded epoxy coating process has good results in protecting reinforcement bars from corrosion. Powder epoxy is fusion bonded to bar at about 2500C temperature.

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