Question

Why my goosebumps stood up while listening national anthem
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Answer 1

Answer:

in respect and you were a little astonished

these are the possibilities.

Answer 2

Answer:

Because the tune of national anthem arises that hidden feeling of patriotism inside you. You have read since childhood about being patriotic and respecting the national symbols and standing in honour of national anthem and song etc. ... And this is the reason when you hear national anthem , you get goose pimples.