Building Materials

31. If is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is

1. 0.70 P
2. 0.75 P
3. 0.80 P
4. 0.85 P

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32. If the iron ore contains clay as an impurity, the flux added during calcination, is

1. Clay
2. Lime stone
3. Argillaceous iron ore
4. All the above

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33. In a mortar, the binding material is

1. Cement
2. Sand
3. Surkhi
4. Cinder

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34. In the method of condensation polymerization,

1. Low-molecular substances are removed from the high molecular substance
2. The reaction proceeds with an evolution of ammonia
3. The reaction proceeds with an evolution of hydrogen chloride
4. All of the above

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35. Index number expressing the relative sizes of both coarse and fine aggregates, is called

1. Proportioning of aggregates
2. Fineness modulus
3. Grading of aggregates
4. None of these

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36. Initial setting time of cement for asbestos cement products should be not less than

1. 30 minutes
2. 50 minutes
3. 75 minutes
4. 90 minutes

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37. Inner part of a timber log surrounding the pitch, is called

1. Sapwood
2. Cambium layer
3. Heart wood
4. None to these

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38. Jumper is a tool used for

1. Testing of stones
2. Quarrying of stones
3. Dressing of stones
4. None of the above

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39. Lime putty

1. Is made from hydraulic lime
2. Is made by adding lime to water
3. Can be used only upto three days
4. All of above

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40. Non acid-resistant asbestos is:

1. Tremolite asbestos
2. Chrysotile asbestos
3. Amosite asbestos
4. None of these

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