Concrete Technology MCQs with answers Page - 50

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Q. As per IS: 459-1978, the concrete mixes are designated into ?

  • (A) 4 grades
  • (B) 5 grades
  • (C) 6 grades
  • (D) 7 grades

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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

A

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Q. Which of the following statement is correct ?

  • (A) The high early strength is obtained by adding tricalcium silicate in cement
  • (B) The dicalcium silicate provides good ultimate strength to cement
  • (C) The tetra calcium alumino ferrite has poor cementing value
  • (D) all of the above

A

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Q. The lime concrete has .......... strength as compared to cement concrete ?

  • (A) less
  • (B) more
  • (C) same
  • (D) any of the above

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

A

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Q. For high degree of workability, the slump value should vary between ?

  • (A) 0 to 25 mm
  • (B) 25 to 50 mm
  • (C) 50 to 80 mm
  • (D) 80 to 100 mm

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Q. The use of air-entraining agents in concrete ?

  • (A) increases workability of concrete
  • (B) decreases bleeding
  • (C) decreases strength
  • (D) all of these

A

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Q. If the fineness modulus of sand is 3, then the sand is graded as ?

  • (A) very fine sand
  • (B) fine sand
  • (C) medium sand
  • (D) coarse sand

A

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Q. Argillaceous materials contain ............ as their major constituent ?

  • (A) calcium
  • (B) lime
  • (C) alumina
  • (D) none

A

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Q. For heat and sound insulation purposes, we shall use ?

  • (A) vacuum concrete
  • (B) air-entrained concrete
  • (C) saw dust concrete
  • (D) both (b) and (c)

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