Concrete Technology and Design

171. Pick up the correct statement from the following:

  1. The maximum size of a coarse aggregate, is 75 mm and minimum 4.75 mm
  2. The maximum size of the fine aggregate, is 4.75 mm and minimum 0.075 mm
  3. The material having particles of size varying from 0.06 mm to 0.002 mm, is known as silt
  4. All the above

Correct answer: (D)
All the above

172. Pick up the incorrect statement applicable to the field test of good cement.

  1. When one thrusts one's hand into a bag of cement, one should feel warm
  2. The colour of the cement is bluish
  3. By rubbing cement in between fingers, one should feed rough
  4. All the above

Correct answer: (D)
All the above

173. Pick up the incorrect statement from the following. For performing compressive strength test of cement

  1. Cement and standard sand mortar are used in the ratio of 1 : 3
  2. Water is added at the rate of (P/4) + 3.0 percentage of water where P is the percentage of water for standard consistency
  3. A cube mould of 10 cm × 10 cm × 10 cm is used
  4. The prepared moulds are kept in a atmosphere of 50% relative humidity

Correct answer: (A)
Cement and standard sand mortar are used in the ratio of 1 : 3

174. Pick up the incorrect statement from the following. While performing preliminary test on concrete

  1. Proportions of the material and water should be the same as to be used at the work site
  2. Cement should be mixed by hand in order to maintain uniformity
  3. Concrete mix should be stored in air-tight containers
  4. Concrete ingredients should be kept at a temperature of 37° ± 2°C

Correct answer: (D)
Concrete ingredients should be kept at a temperature of 37° ± 2°C

175. Pick up the incorrect statement from the following:

  1. Space between the exterior walls of a warehouse and bag piles should be 30 cm
  2. Cement bags should preferably be piled on wooden planks
  3. Width and height of the pile should not exceed 3 m and 2.70 m respectively
  4. None of these

Correct answer: (D)
None of these

176. Poisson's ratio for concrete

  1. Remains constant
  2. Increases with richer mixes
  3. Decreases with richer mixes
  4. None of the above

Correct answer: (B)
Increases with richer mixes

177. Pozzolana cement is used with confidence for construction of

  1. Dams
  2. Massive foundations
  3. R.C.C. structures
  4. All the above

Correct answer: (D)
All the above

178. Pozzolanic properties exist in

  1. Shales
  2. Fly ash
  3. Pumicite
  4. All the above

Correct answer: (D)
All the above

179. Pre-stress loss due to friction occurs

  1. Only in post-tensioned beams
  2. Only in pre-tensioned beams
  3. In both post-tensioned and pre-tensioned beams
  4. None of the above

Correct answer: (A)
Only in post-tensioned beams

180. Proper batching ensures

  1. Economy
  2. Durability
  3. Workability
  4. All the above

Correct answer: (D)
All the above

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