Wattless current: power and power factor of a purely inductive or capacitive circuit

This type of question, asked 3 times: 9 May 2023 S1, 14 May 2024 S1, 14 May 2024 S2. All 3 questions below, oldest first.

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Question 1
9 May 2023 S1
4 $Average power associated with an ideal inductor and ideal capacitor over a complete cycle of a.c. is respectively$
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Question 2
14 May 2024 S1
18 $For a purely inductive or a purely capacitive circuit, the power factor is$
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Question 3
14 May 2024 S2
40 $What will be the phase difference between virtual voltage & virtual current when current in the circuit is wattless?$
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Question 1