99. For preparing a test-speciMen, it is necessary

A. to mix cement and fine aggregate by dry hand

B. to mix coarse aggregates

C. to mix water to the cement, fine aggregates and coarse aggregates

D. all the above

100. The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds

A. 5 kg/cm2

B. 8 kg/cm2

C. 10 kg/cm2

D. 15 kg/cm2

101. For the construction of RCC slabs, columns, beams, walls, etc the grade of concrete mix used, is

A. 1 :3 :6

B. 1 : I: 3

C. 1 :2 :4

D. 1 : 1 :2

102. For the construction of the retaining structures, the type of concrete mix to be used, is

A. 1: 3 : 6

B. 1 : 2 : 4

C. 1: 1: 3

D. 1 : 1 : 2

103. The correct proportion of ingredients of concrete, depends upon

A. bulking of sand

B. water content

C. absorption

D. All the above

104. If the deptl-eof moist sand in a cylinder is 15 cr the depth of the sand when fully inundated with watel cm, the bulking of the moist sand, is

A.10%

B.12%

C.15%

D.25%

105. Pick up the correct statement from the following :

A. The quality Pc water governs the strength of concrete

B. The quantity of water required for concreting, depends upon the grading of aggregate amd method of compaction

C. 10% excess of water reduces the strength of concrete by 15%

D. All the above

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