Please mark true or false: $($F$)(23)$ An effective friction angle is always greater than the total friction angle for the same soil.

$($T$)(24)$ Changing the drainage condition from single drainage to double drainage can reduce the time needed for the same degree of consolidation by a factor of $4.$

$()(25)$ An unconfined compression test was performed on a saturated sample of clay. The sample failed at a maximum loading of $40$kpa. The undrained shear strength determined to be $40$kpa.