Concrete Technology Mcqs

Q:

Evaluation of cracks _________ be determined after cracking.

A) Can B) Can’t
C) Sometimes D) Depends on the structure
 
Answer & Explanation Answer: A) Can

Explanation: Evaluation of cracks can be determined after cracking i.e., due to structural, thermal, chemical, physical activities.

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23
Q:

Which of the following compound is used for fine polishing?

A) Aluminum oxide B) Nitric oxide
C) Silicon carbide D) Iron oxide
 
Answer & Explanation Answer: A) Aluminum oxide

Explanation: Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.

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29
Q:

In Concrete core test the strength is ________ at the top and _________ at the bottom.

A) Lowest, lowest B) Lowest, highest
C) Highest, lowest D) Highest, highest
 
Answer & Explanation Answer: B) Lowest, highest

Explanation: The strength is lowest at the top surface and increases with depth through the element.

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27
Q:

A ratio of core height-to-diameter of __________ gives a standard cylinder test.

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

Explanation: A ratio of core height-to-diameter of 2 gives a standard cylinder test. The ratio of core height to diameter and the location where the core is taken affect the strength.

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27
Q:

It is about __________ times the tensile stress determined by the splitting test.

A) Equal B) .5
C) 1.5 D) 2
 
Answer & Explanation Answer: C) 1.5

Explanation: The theoretical maximum tensile stress at the bottom face at failure is calculated. This is termed the modulus of rupture. It is about 1.5 times the tensile stress determined by the splitting test.

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27
Q:

Compressive strength of hardened concrete is done by _________

A) Cube test B) Tensile splitting test
C) Concrete core test D) Flexure test
 
Answer & Explanation Answer: A) Cube test

Explanation: Compressive strength of hardened concrete is done by cube test. For cube test two types of specimens either cubes of 15cm X 15cm X 15cm or 10cm X 10cm x 10cm depending upon the size of aggregate are used.

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34
Q:

Evaluation of cracks ________ be determined before cracking.

A) Can B) Can’t
C) Sometimes D) Depends on the structure
 
Answer & Explanation Answer: A) Can

Explanation: Evaluation of cracks can be determined before cracking i.e., due to plastic and constructional movements.

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37
Q:

Which one can’t be the reason for the shrinkage of concrete?

A) W/c ratio B) Temperature
C) Cement content D) Formwork
 
Answer & Explanation Answer: D) Formwork

Explanation: Formwork can never cause shrinkage in concrete even it helps to reduce the shrinkage in concrete.

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