$A$ horizontal tube of non-uniform cross-section has radii of $0.1 \,m$ and $0.05 \,m$ respectively at $M$ and $N$. For a streamline flow of an incompressible liquid, the rate of liquid flow is

  • A
    changing continuously with time
  • B
    greater at $M$ than at $N$
  • C
    greater at $N$ than at $M$
  • D
    the same at $M$ and $N$

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