question_answer 29)

                  Motion of an oscillating liquid column in a U-tube is                 (a) periodic but not simple harmonic.                 (b) non-periodic.                 (c) simple harmonic and time period independent of die density of die liquid                 (d) simple harmonic and time period directly proportional to the density c the liquid.

Answer:

                  (c) As \[T=2\pi \sqrt{l/g}\]  (where \[l\] is the length of the oscillating liquid column in each limb), it is independent of the density of the liquid.