Concrete Technology MCQs with answers Page - 27

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Q. The workability of concrete can be improved by adding

  • (A) hydrated lime
  • (B) flyash
  • (C) calcium chloride
  • (D) all of these

A

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Q. In order to provide colour, hardness and strength to the cement, the ingredient used is

  • (A) lime
  • (B) silica
  • (C) alumina
  • (D) iron oxide

A

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Q. In performing the works test

  • (A) the mould for test specimen should be made of non-absorbent material
  • (B) the mould should be constructed in such a way that there is leakage of water from test specimen during moulding
  • (C) the base plate of the mould should be of non-absorbent material
  • (D) all of the above

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Q. The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be

  • (A) 63 : 22 : 6 : 3
  • (B) 62 : 22 : 3 : 6
  • (C) 22 : 63 : 6 : 3
  • (D) 22 : 63 : 3 : 6

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Q. The process of consolidating concrete mix after placing it in position is termed as

  • (A) curing
  • (B) wetting
  • (C) compaction
  • (D) none of these

A

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Q. The main object of proportioning concrete is to obtain

  • (A) required strength and workability
  • (B) desired durability
  • (C) water tightness
  • (D) all of these

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Q. If the water cement ratio is more, then the

  • (A) strength of concrete will be less
  • (B) durability of concrete will be less
  • (C) capillary voids will be more in the physical structure of hydrated cement
  • (D) all of the above

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Q. After the final grinding, the cement is sieved through IS sieve number

  • (A) 9
  • (B) 12
  • (C) 24
  • (D) 48

A

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Q. Blast furnace slag cement

  • (A) develops low heat of hydration
  • (B) has less early strength
  • (C) develops high heat of hydration
  • (D) Both (a) and (b)

A

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Q. The change of state of cement paste from fluid to solid is called hardening.

  • (A) Right
  • (B) Wrong
  • (C) ---
  • (D) ---

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