Building Materials

221. Lacquer is

  1. Oil paint
  2. Distemper
  3. Spirit varnish
  4. None to these

Correct answer: (C)
Spirit varnish

222. Plaster of Paris is obtained by calcining

  1. Bauxite
  2. Gypsum
  3. Lime stone
  4. None of these

Correct answer: (B)
Gypsum

223. Pick up the correct statement from the following:

  1. The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
  2. The silica in excess makes the cement stronger but its setting time also increases
  3. The excess amount of alumina weakens the cement
  4. All the above

Correct answer: (D)
All the above

224. Priming consists of

  1. One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
  2. 8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
  3. One part of white lead, 8 parts of chalk and one part of linseed oil
  4. None to these

Correct answer: (A)
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil

225. The coefficient of hardness of stones used in road work should be greater than

  1. 10
  2. 12
  3. 15
  4. 17

Correct answer: (D)
17

226. Manganese steels

  1. Are non-magnetic
  2. Possess high electrical resistance
  3. Possess low coefficient of expansion
  4. All the above

Correct answer: (D)
All the above

227. The most commonly used base for timber painting, is

  1. Red lead
  2. Zinc white
  3. White lead
  4. Titanium white

Correct answer: (C)
White lead

228. Pick up the correct statement from the following:

  1. Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
  2. The bulking of fine sand is more than that of coarse sand
  3. If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
  4. All the above

Correct answer: (D)
All the above

229. Pick up the correct statement from the following:

  1. For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
  2. For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
  3. For thin structures which remain continuously under water, the water-cement ratio by weight should be 0.55
  4. All the above

Correct answer: (D)
All the above

230. Quartzite is a

  1. Metamorphic rock
  2. Argillaceous rock
  3. Calcareous rock
  4. Siliceous rock

Correct answer: (D)
Siliceous rock

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