41. The unit for coefficient of subgrade modulus is ____.

A.  kN/m²

B.  kNm

C.  kN/m³

D.  kN/m



Answer: A        kN/m³



42. California Bearing Ratio (CBR) ____.

A.  is a method of soil identification

B.  is a measure to indicate the relative strengths of paving materials

C.  is a measure of soil strength

D.  is a procedure for designing flexible pavements



Answer: B      is a measure to indicate the relative strengths of paving materials



43. The position of base course in a flexible pavement is ____.

A.  below the sub-base

B.  over the sub-grade but below the sub-base

C.  over the wearing course when renewal of surface is needed

D.  over the sub-base



Answer: D     over the sub-base


The pavements which have low or negligible flexural strength and are rather flexible in their structural action under the loads are Flexible Pavements. A typical flexible pavement consists of four components:

·       Soil subgrade

·       Sub-Base course

·       Base course

·       Surface course



44. The Modulus of Subgrade Reaction is evaluated from ____.

A.  CBR test

B.  direct shear test

C.  triaxial test

D.  plate bearing test



Answer: D     plate bearing test



45. The load transfer to lower layers in flexible pavements is by ____.

A.  grain to grain contact

B.  consolidation of subgrade

C.  shear deformation

D.  bending action of layers



Answer: A       grain to grain contact


The flexible pavement layers transmit the vertical or compressive stress to the lower layers by grain to grain transfer through the points of contact in the granular structure.




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