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A standard penetration test blow count of 4 in a sand indicates a deposit that is

  • A.cemented and effectively rock-like
  • B.very loose
  • C.very dense and well compacted
  • D.of medium density throughout

Answer: B

Correct answer: very loose

On the standard classification an N value of 0 to 4 in sand is very loose, 4 to 10 loose, 10 to 30 medium dense, 30 to 50 dense and above 50 very dense. A value of 4 therefore indicates a deposit liable to large settlement and, below the water table, potentially to liquefaction.

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