Concrete Technology MCQs with answers Page - 4

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Q. I.S.I. has specified the full strength of concrete after

  • (A) 7 days
  • (B) 14 days
  • (C) 21 days
  • (D) 28 days

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Q. The minimum percentage of chemical ingredient of cement is that of

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

A

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Q. The specifications of a cement bag for storage, are

  • (A) weight 50 kg
  • (B) height 18 cm
  • (C) plan area 3000 sq. cm
  • (D) all the above

A

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Q. The bulk density of aggregates, depends upon

  • (A) shape
  • (B) grading
  • (C) compaction
  • (D) all the above

A

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Q. The concrete mix which causes difficulty in obtaining a smooth finish, possess

  • (A) segregation
  • (B) internal friction
  • (C) harshness
  • (D) bleeding

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Q. An aggregate is known as cyclopean aggregate if its size is more than

  • (A) 4.75 mm
  • (B) 30 mm
  • (C) 60 mm
  • (D) 75 mm

A

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Q. The main object of compaction of concrete, is

  • (A) to eliminate air holes
  • (B) to achieve maximum density
  • (C) to provide intimate contact between the concrete and embedded materials
  • (D) all the above

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Q. Concrete gains strength due to

  • (A) chemical reaction of cement with sand and coarse aggregates
  • (B) evaporation of water from concrete
  • (C) hydration of cement
  • (D) All the above

A

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Q. If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than

  • (A) 20.5 mm
  • (B) 30.5 mm
  • (C) 40.5 mm
  • (D) 50.5 mm

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Q. Log Angles machine is used to test the aggregate for

  • (A) crushing strength
  • (B) impact value
  • (C) abrasion resistance
  • (D) water absorption

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