The diagram above shows a lift pump with valves at P and Q. During a…

The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston
  • A.
    both valves are open
  • B.
    P is open while Q is closed
  • C.
    P is closed while Q is open
  • D.
    Both valves are closed
Correct Answer: Option B
Explanation
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