51. Bulking of coarse aggregate is
a) less as compared to that of sand
b) more as compared to that of sand
c) 15% at 4% moisture content
d) negligible
52. Sand requiring a high water cement ratio, belongs to
a) zone I
b) zone II
c) zone III
d) zone IV
53. Sands of zone I are
a) coarse
b) medium
c) medium to fine
d) fine
54. Fineness modulus modulus of fine aggregate is between
a) 2-3.5
b) 3.5-5.0
c) 5.0-6.0
d) 6.0-7.5
55. The size of fine aggregates does not exceed
a) 2.75 mm
b) 3.00 mm
c) 3.75 mm
d) 4.75 mm
56. The function of fine aggregate is:
a) to assist in producing workability and uniformity in the Mixture
b) to assist the cement paste to hold the coarse aggregate particles in suspension
c) to promote plasticity in the mixture and prevent possible segregation of paste and coarse aggregate
d) all of the above
57. An aggregate should
a) be of proper shape and size
b) be clean, hard and well graded
c) possess chemical stability
d) all of the above
58. An aggregate generally should not preferred for use in concrete is one which has the following surface texture
a) smooth
b) rough
c) glossy
d) granular
59. The rock which is not calcareous, it
a) lime stone
b) macl
c) chalk
d) laterite
60. If fineness modulus of sand is 2.5, it is graded as
a) very fine sand
b) fine sand
c) medium sand
d) coarse sand
61. Pick up the incorrect statement from the following:
a) in properly graded aggregates, bulk density is more
b) in single size aggregates, bulk density is least
c) in single size aggregates, bulk density is maximum
d) none of the above
62. The bulk density of aggregates, depends upon
a) shape
b) grading
c) compaction
d) all of the above
63. The bulk density of aggregates, is generally expressed as
a) tones/cubic metre
b) kg/cubic metre
c) kg/litre
d) gm/ cubic cm
64. Pick up the correct statement from the following:
a) continuous grading is not necessary for obtaining a minimum of air voids
b) the omission of a certain size of aggregate is shown by straight horizontal line on the grading curve
c) the omission of a certain size of aggregate is shown by straight horizontal line on the grading curve
d) all of the above
65. The type of aggregate of same nominal size, which contain less voids when compacted, are
a) rounded spherical
b) irregular
c) flaky
d) none of these
66. Inert material of a cement concrete mix, is
a) water
b) cement
c) aggregate
d) none of the above
67. According to IS: 382-1963, a good aggregate should be
a) chemically inert
b) sufficiently strong
c) hard and durable
d) all of the above
68. An aggregate is known as cyclopean aggregate if its size is more than
a) 4.75 mm
b) 30 mm
c) 60 mm
d) 75 mm
69. Pick up the correct statement from the following:
a) the maximum size of a coarse aggregate, is 75mm and minimum 4.75mm
b) the maximum size of a fine aggregate, is 4.75mm and minimum 0.075mm
c) the material having particles of size varying from 0.06mm to 0.002mm is known as slit
d) the material having particles of size less than 0.002mm, is known as clay
e) all of the above
70. If the aggregates completely pass through a sieve of size 75mm and are retained on a sieve of size 60mm, the particular aggregate will be flaky if its minimum dimension is less than.
a) 20.5 mm
b) 30.5 mm
c) 40.5 mm
d) 50.5 mm
71. In Q.70 be known as elongated aggregate if its length is not less than
a) 91.5mm b)101.5 mm
c)111.5mm d) 121.5 mm
72. An aggregate is said to be flaky, if its least dimension is less than
a) 2/3 mean dimension b) 3/4 mean dimension
c) 3/5 mean dimension d) 5/8 mean dimension
73. A flaky aggregate is said to be elongated if its length is
a) equal to the mean size
b) twice than the mean size
c) thrice than the mean size
d) four times than the mean size
74. The minimum percentage of void in round aggregate is
a) 33 %
b) 53%
b) 43%
d) 63 %
75. The light weight aggregates may be obtained from
a) sedimentary rocks
b) metamorphic rocks
c) igneous rocks
d) volcanic source