Horizontal tube of non-uniform cross-section has radius of  $0.2\,m$ and  $0.1\,m$  respectively at $P$  and  $Q$ . For streamline flow of liquid, the rate of liquid flow

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  • A

    greater at  $P$ than  $Q$

  • B

    greater at $Q$  than $P$

  • C

    changing continuously with time

  • D

    same at  $P$  and  $Q$

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