The fundamental frequency of a sonometer with a weight of $4\,kg$ is $256\,Hz$ . The weight required to produce its octave is .... $kg-wt$
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The octave has double frequency. Hence, the force should be $4$ times the initial value, i.e., $16\,kg-wt$
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Statement $1:$ In the resonance tube experiment, if the tuning fork is replaced by another identical turning fork but with its arm having been filled, the length of the air column should be increased to obtain resonance again.
Statement $2:$ On filling the arms, the frequency of a tuning fork increases.