Find the California Bearing Ratio (CBR) value at 2.5 mm penetration if the load sustained by the specimen at this penetration is 64.6 kg and the standard load sustained by high-quality crushed stone aggregates at the same level is 1370 kg.

After a certain time lapse, clay A achieved 50% average consolidation and clay B achieved 20% average consolidation. Find the ratio of coefficient of consolidation of clay A to that of clay B. The time factor Tv for U = 50% is 0.2 and for U = 20% is 0.03. Both clays have same drainage path lengths.

During a standard Proctor compaction test, the mass of the wet soil sample is found to be 1800 g and its water content is 13%. If the volume of the Proctor mould used is 1000 cm3, then the dry density of the soil sample is: