Building Construction

61. If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then

1. d = 0.445 a
2. d = 0.557 a
3. d = 0.775 a
4. None of these

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62. If height of the first storey of a building is 3.2 m and riser is 13 cm, the number of treads required, is

1. 12
2. 18
3. 24
4. 25

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63. If the depth of an excavation is 20 metres, number of single stage well points to be installed at various levels, is

1. 5
2. 4
3. 3
4. 2

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64. In a colar beam roof

1. There is no horizontal tie beam
2. There is a horizontal tie at the feet of rafters only
3. There is a horizontal tie at almost the middle of rafters only
4. There are two horizontal ties, one at the feet and other at the middle of the rafters

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65. In any good staircase, the maximum and minimum pitch respectively should be

1. 90° and 0°
2. 75° and 30°
3. 60° and 10°
4. 40° and 25°

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66. In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to

1. Increase the depth of foundation
2. Drain the soil
3. Compact the soil
4. Replace the poor soil

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67. In case of foundations on sandy soil, maximum permissible differential settlement, is usually limited to

1. 15 mm
2. 25 mm
3. 35 mm
4. 45 mm

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68. In case of multi-storeyed buildings, the forms to be removed first are

1. Sides of beams and girders
2. Column forms
3. Bottom of beams and girders
4. All the above at the same time

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69. In case of Raymond pile

1. Lengths vary from 6 m to 12 m
2. Diameter of top of piles varies from 40 cm to 60 cm
3. Diameter of pile at bottom varies from 20 cm to 28 cm
4. All the above

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70. In clay soil

1. Swelling and shrinkage characteristics prevail
2. Consolidation continues even after several years of construction
3. Differential settlement is generally prevalent
4. All the above

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