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6. Q. No. 96 Paper-I Percussion drilling is unsuitable in -----------

(A) Unconsolidated sand (B) Unconsolidated gravel (C) Quick sand (D) Consolidated rock the answer is declared by BSNL option D i.e. Consolidated rocks is wrong because as per book of Soil mechanics and foundation engineering author Dr. B.C. Punmia and Shushil Kumar in book building construction on page No.  378 and 20 respectively writers clearly This method can be adopted in rocks and soil having boulders however this method is not recommended for loose sand or clayey soils. hence the answer declared by BSNL option D i.e. Consolidated rocks is wrong hence it may be corrected.