## Answers

Correct options are : **1 and 2** because **only the lengths differ**.

**Reason :** To observe the effect of length on time period, it is better to keep all other parameters same, so that we can vary the length and record the time taken to complete one oscillation. Since the mass attached to string 3 differs from that attached to strings 1 and 2, we should not choose string 3 as a part of our experiment.

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