Concrete Technology MCQs with answers Page - 7

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Q. Gypsum is added for

  • (A) colour
  • (B) strength
  • (C) controlling setting time
  • (D) none of these

A

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Q. Cement used for normal concrete construction, is obtained by burning a mixture of

  • (A) silicious and argillaceous materials
  • (B) argilaceous and calcareous materials
  • (C) silicious and catcareous materials
  • (D) silicious, argillaceous and calcareous materials

A

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Q. In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

  • (A) 20 times
  • (B) 25 times
  • (C) 30 times
  • (D) 40 times

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Q. Efflorescence in cement is caused due to an excess of

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

A

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Q. Slump test of concrete is a measure of its

  • (A) consistency
  • (B) compressive strength
  • (C) tensile strength
  • (D) impact value.

A

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Q. The most useless aggregate is one whose surface texture is

  • (A) smooth
  • (B) granular
  • (C) glassy
  • (D) honey combed and porous

A

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Q. The top diameter, bottom diameter and the height of a slump mould are :

  • (A) 10 cm, 20 cm, 30 cm
  • (B) 10 cm, 30 cm, 20 cm
  • (C) 20 cm, 10 cm, 30 cm
  • (D) 20 cm, 30 cm, 10 cm

A

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Q. For concreting tunnel linings, transportation of concrete is done by

  • (A) pans
  • (B) wheel borrows
  • (C) containers
  • (D) pumps

A

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Q. Admixture which cause early setting and hardening of concrete are called …

  • (A) Workability admixtures
  • (B) accelerators
  • (C) retarders
  • (D) air entraining agents

A

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Q. As compared to ordinary Portland cement, high alumina cement has

  • (A) higher initial setting time but lower final setting time
  • (B) lower initial setting time but higher final setting time
  • (C) none
  • (D) all

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