Resonating lengths of an air column closed at one end for a given tuning fork

This type of question, asked 3 times: 9 May 2023 S1, 11 May 2023 S1, 16 Apr 2026 S2. All 3 questions below, oldest first.

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Question 1
9 May 2023 S1
50 $A tuning fork of frequency 340 Hz is vibrated just above a tube of 120 cm height. Water is slowly poured in the tube. What is the minimum height of water necessary for resonance?$
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Question 2
11 May 2023 S1
27 $A resonance tube closed at one end is of height 1.5 m. A tuning fork of frequency 340 Hz is vibrating above the tube. Water is poured in the tube gradually. The minimum height of water column for which resonance is obtained is (Neglect end correction, speed of sound in air = 340 m/s)$
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Question 3
16 Apr 2026 S2
121 $An air column in a pipe which is closed at one end will be in resonance with a vibrating tuning fork of frequency 415 Hz for various vibrating air columns. Which one of the following lengths is not in resonance ? (velocity of sound in air = 332 m/s) (Neglect end correction)$
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Question 1