Building Materials

171. Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:

1. Absence of sun light
2. Dampness
3. Presence of sap
4. All the above

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172. Crushing strength of a first class brick should not be less than

1. 3.5 N/mm²
2. 7.0 N/mm²
3. 10.5 N/mm²
4. 14.0 N/mm²

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173. Pick up the correct statement from the following:

1. Rust is due to formation of oxides
2. Cast iron oxidises less
3. Steel oxidises most
4. All the above

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174. The main constituent of cement which is responsible for initial setting of cement is

1. Di-calcium silicate
2. Tri-calcium silicate
3. Tri-calcium aluminate
4. All of the above

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175. Pick up the correct statement from the following:

1. The low voltage porcelain is prepared by wet process
2. The high voltage porcelain is prepared by dry process
3. The low voltage porcelain is prepared by dry process
4. None of the above

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176. In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as

1. English bond
2. Double Flemish bond
3. Zigzag bond
4. Single Flemish bond

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177. In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they

1. Split easily
2. Are affected by moisture
3. Both (A) and (B)
4. None of these

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178. Granite is not suitable for ordinary building purpose because

1. It cannot be polished
2. It is not a fire proof material
3. It is costly
4. It has less crushing strength

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179. Lacquer paints

1. Are generally applied on structural steel
2. Are less durable as compared to enamel paints
3. Consist of resin and nitro-cellulose
4. All the above

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180. Glazing is used to make earthenware

1. Hard
2. Soft
3. Porous
4. Impervious

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