A wooden piece floats half submerged in a tub of water. If the system is transferred to a lift ascending with acceleration the wooden piece will
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As the system will move with an acceleration, $a$ then psuedo force will cause same acceleration, $a$ to both the water and block so no extra force by the block will be applied to water so no more submerging.
So option $\mathrm{C}$ is correct.
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