Problem $4(20\backslash \%)$: A Standard Penetration Test $($SPT$)$ is conducted in the soil profile given below. A corrected blow count number of $35$ is obtained at point $\backslash ($ B $\backslash ).$ What would be the effective stress$-$based friction angle $(\backslash (\backslash$phi$^\{\backslash$prime$\}\backslash ))$ at point B$?$ If needed, use linear interpolation when inferring the $\backslash (\backslash$phi$^\{\backslash$prime$\}\backslash )$ from the figure below.

Problem $5(20\backslash \%)$: In the Standard Penetration Test $($SPT$),$ how the blow counts are measured? Please describe it briefly.

Problem $6(20\backslash \%)$: What are the major differences between the Cone Penetration Test $($CPT$)$ and the Standard Penetration Test $($SPT$).$ List three of them.