Concrete Technology MCQs with answers Page - 44

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Q. When the concrete mix is too wet, it causes ?

  • (A) segregation
  • (B) low density
  • (C) excess laitance at the top
  • (D) all of these

A

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Q. The top diameter, bottom diameter and height of the mould used for slump test are respectively ?

  • (A) 100 mm, 200 mm, 300 mm
  • (B) 200 mm, 100 mm, 300 mm
  • (C) 200 mm, 300 mm, 100 mm
  • (D) 100 mm, 300 mm, 200 mm

A

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Q. For highly loaded columns, the concrete mix used is of proportion ?

  • (A) 1:1:2
  • (B) 1:1.5:3
  • (C) 1:2:4
  • (D) 1:3:6

A

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Q. The term 'ware-house pack' means ?

  • (A) the total capacity of ware-house
  • (B) packing of ware-house
  • (C) pressure compaction of bags on lower layers
  • (D) pressure exertion of bags on upper layers

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Q. Which of the following statement is correct while compacting concrete with vibrator ?

  • (A) The vibrator should be inserted horizontally
  • (B) The vibrator should not be immersed through a full depth of freshly laid concrete
  • (C) The vibrator should not touch the form surface
  • (D) all of the above

A

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Q. In concrete walls, construction joints should be provided at the ?

  • (A) floor level
  • (B) soffit level of lintels
  • (C) sill level of windows
  • (D) all of these

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Q. The most useless aggregate is, whose surface texture is ?

  • (A) smooth
  • (B) glossy
  • (C) granular
  • (D) porous

A

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Q. Blast furnace slag cement ?

  • (A) develops low heat of hydration
  • (B) Don’t have early strength
  • (C) develops high heat of hydration
  • (D) has high early strength

A

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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. The characteristic, which makes the concrete a versatile and widely used material of modem construction, is the possibility of ?

  • (A) controlling the properties of concrete by using appropriate ingredients
  • (B) moulding the concrete in any desired shape
  • (C) complete mechanisation of concrete preparation and its placing process
  • (D) all of the above

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