Building Materials

61. Soundness of cement is tested by

1. Vicat's apparatus
2. Le-chatelier apparatus
3. Compressive strength testing apparatus
4. None of these

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62. Spalling hammer is used for

1. Driving wooden headed chisels
2. Rough dressing of stones
3. Carving of stones
4. Breaking small projection of stones

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63. Specific gravity for most of the building stones lies between

1. 1.5 to 2.0
2. 2.0 to 2.5
3. 2.5 to 3.0
4. 3.0 to 3.5

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64. Strength of cement concrete primarily depends upon

1. Quality of water
2. Quantity of aggregate
3. Quantity of cement
4. Water-cement ratio

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65. The age of a tree can be known by examining

1. Cambium layer
2. Annular rings
3. Medullary rays
4. Heart wood

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66. The basic purpose of a retarder in concrete is

1. To increase the initial setting time of cement paste in concrete
2. To decrease the initial setting time of cement paste in concrete
3. To render the concrete more water tight
4. To improve the workability of concrete mix

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67. The constituent of cement which is responsible for all the undesirable properties of cement is

1. Di-calcium silicate
2. Tri-calcium silicate
3. Tri-calcium aluminate
4. Tetra calcium alumino ferrite

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68. The initial setting time for ordinary Portland cement as per IS specifications should not be less than

1. 10 minutes
2. 30 minutes
3. 60 minutes
4. 600 minutes

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69. The internal size of mould used in brick preparation is

1. Equal to the size of a fully burnt brick
2. Smaller than the size of a fully burnt brick
3. Greater than the size of a fully burnt brick
4. None of the above

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70. The main function of alumina in brick earth is

1. To impart plasticity
2. To make the brick durable
3. To prevent shrinkage
4. To make the brick impermeable

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