Boring method is to be chosen depending upon the type of exploratory strata. In this context, match List I with List II and select the correct answer using the codes given below the lists:
List -I
P. Auger boring
Q. Wash boring
R. Percussion drilling
S. Rotary drilling
List -II
1. Partly saturated sands, silts and medium to stiff cohesive soils
2. All types of soil and rocks except in stony or porous soils and fissured rocks
3. Practically all types of soils except hard and cemented soil or rock
4. All types of soils and rocks. Difficult in loose sands and soft sticky clays.
P-1 Q-4 R-3 S-2
P-1 Q-3 R-4 S-2
P-2 Q-3 R-4 S-1
P-2 Q-4 R-3 S-1
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