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Civil Engineering Objective Questions { Concrete Technology }

50. The bulk density of aggregates does not depend upon :
A. size and shape of aggregates
B. specific gravity of aggregates
C. grading of aggregates
D. size and shape of the container
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51. The aggregate containing moisture in pores and having its suface dry, is known as
A. moist aggregates
B. very dry aggregates
C. dry aggregates
D. saturated surface dry aggregate
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52.  Pick up the correct statement from the following:
A. Bulking of sand is caused due to formation of a thin film of surface moisture
B. Fine sand bulks more than coarse sand
C. With 10% moisture content by weight, the bulking of sand is increased by 50%
D. All the above
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53. Log Angles machine is used to test the aggregate for
A. crushing strength
B. impact value
C. abrasion resistance
D. water absorption
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54.  Pick up the correct statement from the following :
A. The bulk density of fine aggregate is usually about 10 per cent more than that of coarse aggregate of similar composition
B. The specific gravity of aggregate is important for the determination of the moisture content
C. The absorption and porosity of an aggregate influence the property of the concrete
D. All the above
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55.  if 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 nun, 475 ram, 236 mm, 118 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
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56.  If fineness modulus of sand is 25, it is graded as
A. very fine sand
B. fine sand
C. medium sand
D. coarse sand
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