GATE Civil Engineering
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Which of the following statements is NOT correct?

  1. Loose sand exhibits contractive behavior upon shearing
  2. Dense sand when sheared under undrained condition, may lead to generation of negative pore pressure
  3. Black cotton sild exhibits expansive behavior
  4. Liquefaction is the phenomenon where cohesionless soil near the downstream side of dams or sheet-piles loses its shear strength due to high upward hydraulic gradient
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