In a concrete mix M20 , '20 'stands for .......................

• compressive strength

• Tensile strength

• Characteristic compressive strength

• Flexural strength

M50 is a ....................... strength concrete

• High

• Standard

• Medium

• low

The mixes of fixed cement-aggregate ratio which ensures adequate strength are termed

• concrete mixes
• aggregate mixes
• nominal mixes

• design mixes

The ratio of the volume of water to the volume of cement used to form concrete is

termed as

• cement-aggregate ratio

• water- aggregate ratio

• Aggregate - cement ratio

• water- cement ratio

Abram’s law states that 'the strength of concrete is ......................... proportional to the water-cement ratio'

• equal

• directly

• inversely

• indirectly

.......................................can be added to concrete to increase workability at low water content

• Additives

• Admixtures

• coagulants

• Aggregates

Concrete ........................ refers to how easily freshly mixed

concrete can be placed, consolidated and finished with minimal loss of homogeneity.

• permeability

• homogeneity

• heterogeneity

• wokability

The ........................ indicates that the result is incomplete, and concrete to be

retested.

• shear slump

• collapsed slump

• Zero slump

• True slump

............................of concrete is the separation of ingredients in concrete.

• Bleeding

• segregation

• separation

The defect in which water rises to the top of concrete and wash away the cement particles along with is called ..............

• Segregation

• Bleeding

• porosity

• capillarity