Building Materials

141. The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick

1. 20%
2. 15%
3. 10%
4. None of these

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142. Pug mill is used for

1. Preparation of clay
2. Moulding of clay
3. Drying of bricks
4. Burning of bricks

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143. Pick up the synthetic resin from the following:

1. Urea resin
2. Phenolic resin
3. Resorcinol resin
4. All of these

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144. Addition of pozzolana to ordinary Portland cement increases

1. Bleeding
2. Shrinkage
3. Permeability
4. Heat of hydration

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145. Plastics are compounds of carbon with element

1. Hydrogen
2. Nitrogen
3. Oxygen
4. All of these

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146. Paints with white lead base are suitable for painting of

1. Wood work
2. Iron work
3. Both wood work and iron work
4. None of the above

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147. For a good building stone, its specific gravity should the greater than

1. 1.5
2. 1.7
3. 2.2
4. 2.7

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148. Sandstone is a
(i) Sedimentary rock
(ii) Aqueous rock
(iii) Siliceous rock
The correct answer is

1. Only (i)
2. Both (i) and (ii)
3. Both (i) and (iii)
4. All (i), (ii) and (iii)

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149. The rocks having alumina or clay as their major constituents are known as

1. Siliceous rocks
2. Argillaceous rocks
3. Calcareous rocks
4. Sedimentary rocks

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150. The practical limit of moisture content achieved in air drying of timber is

1. 5%
2. 15%
3. 25%
4. 35%

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