Question

(iii) He does not know how to play upon .....piano


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Answer 1

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$\mathfrak{The\:Answer\:is}$

He does not know how to play upon a piano.

$\boxed{Hope\:This\:Helps}$

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Answer 2

Question :-- He does not know how to play upon .....piano ..

Answer :- He does not know how to play upon the piano..

Explanation :-- We use the phrasing "play the piano" because the piano isn't technically what is being played but it's the tool by which music is being played.