Building Materials

291. The rocks formed by gradual deposition, are called

1. Sedimentary rocks
2. Igneous rocks
3. Metamorphic rocks
4. None of these

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292. Plastic

1. Is an organic substance
2. Consists of natural or synthetic binders
3. Finished products are rigid and stable at normal temperature
4. All the above

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293. Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a

1. Cant
2. Deal
3. Baulk
4. Strip

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294. Rocks formed due to alteration of original structure due to heat and excessive pressure are called

1. Sedimentary rocks
2. Igneous rocks
3. Metamorphic rocks
4. None of these

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295. Geologically, marble is known as

1. Sedimentary rock
2. Igneous rock
3. Metamorphic rock
4. Stratified rock

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296. Iron ore may contain

1. Carbon
2. Silicon
3. Phosphorus and manganese
4. All the above

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297. Pick up the incorrect statement from the following:

1. Plastics are chemical resistant
2. Plastics are durable
3. Plastics are ductile
4. Plastics are excellent electric insulators

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298. The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

1. Radial shakes
2. Heart shakes
3. Wind cracks
4. Twisted fibres

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299. Pig iron is manufactured from the ores by

1. Dressing
2. Calcination and roasting
3. Smelting
4. All the above

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300. Pick up the correct statement from the following:

1. The plywoods do not split or crack due to changes in atmosphere
2. The commercial plywoods are available upto 150 cm wide and upto 300 cm long
3. The plywoods possess uniform tensile strength in all directions
4. All the above

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