Building Materials

81. The slenderness ratio for masonry walls should not be more than

1. 10
2. 20
3. 30
4. 40

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82. The stone suitable for rubble masonry should be.

1. Hard
2. Tough
3. Heavy
4. Light

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83. The stretcher bond in brick masonry can be used only when the thickness of wall is

1. 90 mm
2. 180 mm
3. 190 mm
4. 280 mm

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84. The tendency of a stone is, to split along:

1. Texture
2. Fracture
3. Cleavage
4. Structure

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85. The type of bond provided in brick masonry for carrying heavy loads is

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

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86. The ultimate tensile strength of structural mild steel is about

1. 160 N/mm²
2. 260 N/mm²
3. 420 N/mm²
4. 520 N/mm²

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87. The vehicle used in case of enamel paints is usually

1. Linseed oil
2. Water
3. Varnish
4. None of the above

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88. Veneering means

1. Carving out designs on timber planks
2. Chemically treating timber planks
3. Thick layer of superior wood glued to inferior wood
4. Thin layer of superior wood glued to inferior wood

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89. When a brick is immersed in water for 24 hours and then dried, if

1. No grey or white deposits appear on the surface, the brick is free from soluble salts
2. 10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
3. 50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
4. All the above

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90. Which of the following cements contains maximum percentage of dicalcium silicate?

1. Ordinary Portland cement
2. Low heat cement
3. Rapid hardening cement
4. Sulphate resisting cement

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