A child walks on a level surface from point P to point Q at a bearing of 30°, from point Q to point R at a bearing of 90° and then directly returns to the starting point P at a bearing of 240°. The straight-line paths PQ and QR are 4 m each. Assuming that all bearings are measured from the magnetic north in degrees, the straight-line path length RP (in meters) is ______________ (rounded off to the nearest integer).

Differential levelling is carried out from point P (BM: +200.000 m) to point R. The readings taken are given in the table.

Reduced Level (in meters) of the point R is ____ (rounded off to 3 decimal places).

The contact pressure distribution shown in the figure belongs to a

Which one of the following saturated fine-grained soils can attain a negative Skempton’s pore pressure coefficient (A)?