7.While compacting the concrete by a mechanical vibrator, the slump should not exceed A.2.5 cm B.5.0 cm C.7.5 cm D.10 cm E. 15 cm 8.Workability improved by adding A.air-entraining agent B.foaming agent C.oily-agent D.aluminium compound E, all the above 9.Curing a concrete for long period ensures better A.volume stability B. strength Cwater resistance Dwater tightness and durability E, all the above. 10.Slump test is done for A.clay Clime 11.Workability of concrete is measured by A. Vicat apparatus test B.Slump test C.Minimum void method D.Talbot Richard test B.sand D.concrete 12.Internal friction between the ingredients of concrete, is decreased by using A.less water B. fine aggregates Crich mix D.more water and coarse aggregates E. none of these 13.For road pavements, the cement generally used, is A.ordinary Portland cement B.rapid hardening cement C.low heat cement D.blast furnace slag cement E. none of these.