Match List-I (Type of foundations) with List-II (Suitability) and select the correct answer using the codes given below the lists:
List-I
A. Spread footings
B. Under reamed piles
C. Raft foundation
D. Deep foundation
List-II
Codes :
A B C D
A
4 1 3 2
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B
3 2 4 1
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C
4 2 3 1
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D
3 1 4 2
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Solution
The correct option is B 3 2 4 1 In the case of loose sand there may be loose pockets causing differential settlements. Raft foundations reduce the differential settlements and higher allowable soil pressure may be used for design of rafts on loose sands.
Under-reamed piles are suitable to bear the swelling pressure caused by black cotton soil.