Horizontal tube of non-uniform cross-section has radii of  $0.1\,m$ and  $0.05\,m$ respectively at $M$  and  $N.$  For a stream-line flow of liquid the rate of liquid flow is
  • A
    Continuously changes with time
  • BGreater at  $M$  than at $N$
  • CGreater at $N$  than at  $M$
  • DSame at $M$  and  $N$
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