Building Materials

251. Acrylic is the name of

  1. Cellulose resin
  2. Alkyd resin
  3. Methyl methacrylate
  4. Cumarone-indene

Correct answer: (C)
Methyl methacrylate

252. The PVC doors and windows are preferred as they are

  1. Rust proof
  2. Rot proof
  3. Water proof
  4. All of these

Correct answer: (D)
All of these

253. The sequence of refractory materials according to increasing melting points is:

  1. Dolomite, Magnesia, Bauxite, Chromites
  2. Bauxite, Chromites, Dolomite, Magnesia
  3. Magnesia, Bauxite, Dolomite, Chromites
  4. None of these

Correct answer: (B)
Bauxite, Chromites, Dolomite, Magnesia

254. Upto a maximum of 72% of iron, is available in

  1. Magnetite
  2. Limonite
  3. Siderite
  4. Iron pyrites

Correct answer: (A)
Magnetite

255. The melting point of silica is:

  1. 1570°C
  2. 1630°C
  3. 1730°C
  4. 1850°C

Correct answer: (C)
1730°C

256. Lime stones are generally known as

  1. Aqueous rocks
  2. Sedimentary rocks
  3. Stratified rocks
  4. All the above

Correct answer: (D)
All the above

257. Stones used for rubble masonry must be

  1. Soft
  2. Hard
  3. Light
  4. Heavy

Correct answer: (B)
Hard

258. The property by virtue of which lime sets under water, is known as

  1. Slacking
  2. Setting
  3. Hydraulicity
  4. Calcining

Correct answer: (C)
Hydraulicity

259. Porcelain is used as:

  1. Sanitary wares
  2. Electric insulators
  3. Storage vessels
  4. Reactor chambers

Correct answer: (D)
Reactor chambers

260. The lime which contains high percentage of calcium oxide, is generally called

  1. Fat lime
  2. Rich lime
  3. White lime
  4. None of these

Correct answer: (D)
None of these

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