Building Materials

161. Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as

1. Bessemer pig
2. Grey or foundry pig
3. White or forge pig
4. Mottled pig

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162. Le-Chatelier's device is used for determining the

1. Setting time of cement
2. Soundness of cement
3. Tensile strength of cement
4. Compressive strength of cement

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163. Red short iron cracks when bent due to the presence of

1. Sulphur
2. Carbon
3. Phosphorus
4. Silicon

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164. Percentage of carbon content in mild steel is

1. Less than 0.25
2. Between 0.25 and 0.7
3. Between 0.7 and 1.5
4. Greater than 1.5

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165. The method of addition polymerization is used for obtaining:

1. Polystyrene
2. Polypropylene
3. Polyvinylchloride
4. All of these

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166. Which of the following metamorphic rocks has the most weather resisting characteristics?

1. Marble
2. Quartzite
3. Slate
4. Lime stone

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167. To retard the initial setting time of cement, the compound responsible, is

1. Tri-calcium silicate
2. Gypsum
3. Di-calcium silicate
4. Tri-calcium aluminate

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168. Seasoning of timber is done for

1. Increasing moisture content
2. Decreasing moisture content
3. Increasing strength of timber
4. None to these

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169. The steel used for the manufacture of rails, is

1. Bessemer steel
2. Mild steel
3. Cast steel
4. Stainless steel

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170. Durability of building stone is affected by its

1. Chemical composition
2. Texture
3. Resistance to atmosphere
4. All the above

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