As shown in the figure, the applied stress from the base of a lamp post (Q) is 22 kPa. Determine the vertical stress increment, Δσ_z at point A (r = 2m and z=2m) due to the point load of the lamp post.

State whether the following sentence is true or false.

Particle size distribution curve shows the relationship between the particle size and percentage passage of a soil sample.

As stated in the sieve analysis  lab video, what is the vibration frequency used in the mechanical shaker?

State whether the following sentence is true or false.

Pneumatic compaction and steel rod tamping is used to achieve the densest state to calculate the maximum dry density of sand.

After carefully rotating the measuring cylinder to obtain the minimum dry density, the surface of the sand sample becomes inclined. What is the value to be considered as the volume of the sand sample at this stage?

State whether the following sentence is true or false.

Maximum void ratio corresponds to the maximum dry density of the sand sample.

Total pressure at point A of the below figure is;

State whether the following statement is true or false.

Pore pressure taken by pore water in voids is equal in intensity in all directions.

The correct relationship between the effective stress (σ'), total stress (σ) and the pore water pressure (u) is,