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Which of the following statements are $CORRECT$?

  1. For a rheopectic fluid, the apparent viscosity increase with time under a constant applied shear stress
  2. For a pseudoplastic fluid, the apparent viscosity decreases with time under a constant applied shear stress
  3. For a Bingham plastic, the apparent viscosity increases exponentially with the deformation rate
  4. For a dilatant fluid, the apparent viscosity increase with increasing deformation rate
  1. $P$ and $Q$ only
  2. $Q$ and $R$ only
  3. $R$ and $S$ only
  4. $P$ and $S$ only
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