The height of liquid column in a $U$ tube is $0.3$ meter. If the liquid in one of the limbs is depressed and then released, then the time period of liquid column will be $.......\,sec$ 
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(c)

$T =2 \pi \sqrt{\frac{ h }{ g }}$ or $T =2 \times 3.14 \times \sqrt{\frac{0.3}{9.8}}=1.1 sec$

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