Building Materials

41. Number of bricks required for one cubic metre of brick masonry is

1. 400
2. 450
3. 500
4. 550

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42. Oil varnish generally consists of

1. Synthetic resin and spirit
2. Oil, wax and resin
3. Resin, oil and turpentine
4. Spirit, oil and wax

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43. Percentage of silica 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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44. Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:

1. Alumina
2. Lime
3. Iron-oxide
4. Magnesia

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45. Pick up the correct statement from the following:

1. In stone arches, the stones are placed with their natural beds radial
2. In cornices, the stones are placed with their natural beds as vertical
3. In stone walls, the stones are placed with their natural beds as horizontal
4. All the above

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46. Pick up the incorrect statement from the following:

1. Hydraulic lime is generally obtained by burning kankar
2. Hydraulic lime sets slowly as compared to fat lime
3. Hydraulic lime is generally used in lime mortar
4. None of these

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47. Pick up the volcanic rock from the following:

1. Granite
2. Dolerite
3. Basalt
4. All the above

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48. Plywood has the advantage of

1. Greater tensile strength in longer direction
2. Greater tensile strength in shorter direction
3. Same tensile strength in all directions
4. None of the above

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49. Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is

1. 0°
2. 30°
3. 45°
4. 90°

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50. Plywood is normally available

1. 1 mm thick
2. 2 mm thick
3. 2 to 3 mm thick
4. 3 mm to 4 mm thick

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