Building Materials

151. Glazing of clay products, is done

1. To improve their appearance
2. To protect them from atmospheric effect
3. To protect them from corrosive action
4. All the above

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152. Study the following statements.
(i) Hydraulic lime is suitable for white washing,
(ii) Fat lime is suitable for whitewashing,
(iii) Hydraulic lime is suitable for making mortar,
(iv) Fat lime is suitable for making mortar.
The correct answer is

1. (i) and (iv)
2. (ii) and (iii)
3. (i) and (ii)
4. (iii) and (iv)

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153. The yield strength and tensile strength of low carbon steel may be improved by the addition of

1. Manganese
2. Chromium
3. Nickel
4. Vanadium

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154. Three basic raw materials which are needed in large quantities for production of steel are

1. Iron ore, coal and sulphur
2. Iron ore, carbon and sulphur
3. Iron ore, coal and lime stone
4. Iron ore, carbon and lime stone

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155. To give a brilliant finish, the type of varnish used, is

1. Water varnish
2. Spirit varnish
3. Turpentine varnish
4. Oil varnish

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156. Which of the following should be used for hearting of thicker walls?

1. Headers
2. Stretchers
3. Brick bats
4. Queen closer

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157. Asbestos

1. Is an excellent insulator for heat and electricity
2. Is fire-proof and acid proof
3. Has sp. gravity equal to 3.10
4. All the above

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158. A heavy stone is suitable for

1. Arches
2. Rubble masonry
3. Roads
4. Retaining walls

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159. Pick up the correct statement from the following:

1. Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon
2. The edges of a finished wrought iron are rough due to red shortage
3. Pig iron (charcoal) is manufactured from magnetic ore (Fe₃O₄)
4. All the above

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160. The percentage of alumina in a good brick earth lies between

1. 5 to 10 %
2. 20 to 30 %
3. 50 to 60 %
4. 70 to 80 %

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