Question

Which Short key is used to apply Non-printing Character​

Answer 1

With a shortcut key.
This is Ctrl+* (Ctrl+Shift+8 on U.S. keyboards). If you've ever turned on display of nonprinting characters unintentionally, it may have been by accidentally pressing this key combination when you were trying to type an asterisk.
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Answer 2

Explanation:

With a shortcut key.

This is Ctrl+* (Ctrl+Shift+8 on U.S. keyboards). If you've ever turned on display of nonprinting characters unintentionally, it may have been by accidentally pressing this key combination when you were trying to type an asterisk.