rms speed of molecules when a gas is compressed isothermally

The same question, asked 4 times: 4 May 2023 S2*, 11 May 2024 S1, 20 Apr 2025 S2, 16 Apr 2026 S2. Every wording below, oldest first.

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Question 1
4 May 2023 S2
35 $A perfect gas of volume 5 litre is compressed isothermally to volume of 1 litre. The r.m.s. speed of the molecules will$
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Question 2
11 May 2024 S1
45 $If a gas is compressed isothermally then the r.m.s. velocity of the molecules$
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Question 3
20 Apr 2025 S2
6 $If a gas is compressed isothermally then the r.m.s. velocity of its molecules$
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Question 4
16 Apr 2026 S2
117 $If a gas is compressed isothermally then the r.m.s. velocity of the molecules$
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Question 1