Building Materials

91. Which of the following has more fire resisting characteristics?

1. Marble
2. Lime stone
3. Compact sand stone
4. Granite

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92. Which of the following ingredients of the brick earth enables the brick to retain its shape?

1. Alumina
2. Silica
3. Iron
4. Magnesia

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93. Which of the following is a rock?

1. Quartz
2. Mica
3. Gypsum
4. None of the above

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94. Which of the following is the purest form of iron?

1. Cast iron
2. Wrought iron
3. Mild steel
4. High carbon steel

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95. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?

1. Lime stone and alumina
2. Silica and alkalies
3. Alumina and iron
4. Alkalies and magnesium

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96. Which of the following represents a metamorphic rock?
(i) Slate
(ii) Shale
(iii) Quartzite
The correct answer is

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

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97. Which of the following sedimentary rocks changes into quartzite by metamorphic action?

1. Sand stone
2. Lime stone
3. Shale
4. Gypsum

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98. Which of the following stone is best suited for construction of piers and abutments of a railway bridge?

1. Granite
2. Sand stone
3. Lime stone
4. Quartzite

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99. Which of the following stresses is used for identifying the quality of structural steel?

1. Ultimate stress
2. Yield stress
3. Proof stress
4. None of the above

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100. Which of the following trees yields hard wood?

1. Deodar
2. Chir
3. Shishum
4. Pine

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