This is the IIT JEE Last year papers for physics:

13. Aperson blows into open-end of a long pipe. As a result, a high-pressure pulse of air travels down the pipe.
When this pulse reaches the other end of the pipe.
(A) a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
(B) a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
(C) a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
(D) a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
Ans. (B), (D)
Sol. At open end phase of pressure wave charge by so compression returns as rarefraction.While at closed
end phase of pressure wave does not change so compression return as compression







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