Concrete Technology MCQs with answers Page - 46

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Q. If the aggregate completely passes through a 50 mm sieve and retained on 40 mm sieve, then the particular aggregate is said to be flaky if its least dimension is less than ?

  • (A) 27 mm
  • (B) 37 mm
  • (C) 47 mm
  • (D) 57 mm

A

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Q. For the manufacture of concrete of low density, the aggregate used ?

  • (A) furnace clinker
  • (B) coke breeze
  • (C) saw dust
  • (D) all of these

A

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Q. The length of Vicat plunger in Vicat's apparatus varies from ?

  • (A) 20 to 30 mm
  • (B) 30 to 40 mm
  • (C) 40 to 50 mm
  • (D) 50 to 60 mm

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Q. The setting time of cement is the governing factor for ?

  • (A) mixing of concrete
  • (B) placing of concrete
  • (C) compaction of concrete
  • (D) all of these

A

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Q. Insufficient quantity of water ?

  • (A) makes the concrete mix soft
  • (B) makes the concrete mix unworkable
  • (C) causes segregation in concrete
  • (D) causes bleeding in concrete

A

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Q. The aggregates of .......... shape have maximum voids ?

  • (A) irregular
  • (B) angular
  • (C) rounded
  • (D) flaky

A

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Q. Excess quantity of water ?

  • (A) makes the concrete mix harsh
  • (B) makes the concrete mix unworkable
  • (C) causes segregation in concrete
  • (D) both a and b

A

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Q. The Indian standard code specifies that the crushing strength for which the mix should be designed in the laboratory should be ................... the strength actually required ?

  • (A) 1.25
  • (B) 1.5
  • (C) 2
  • (D) 2.5

A

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Q. Which of the following grade is not recommended by IS 456-1978 ?

  • (A) M 10
  • (B) M 55
  • (C) M 20
  • (D) M 40

A

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Q. The steel mould used for slump test is in the form of a ?

  • (A) cube
  • (B) cylinder
  • (C) frustrum of a cone
  • (D) none of these

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