Q112 / 150 · MHT CET 2021 (24 Sep Shift 1) · Physics

Water rises up to a height of $4 \mathrm{~cm}$ in a capillary tube. The lower end of the capillary tube is at a depth of $8 \mathrm{~cm}$ below the water level. The mouth pressure required to blow an air bubble at the lower end of the capillary will be ' $\mathrm{X}$ ' $\mathrm{cm}$ of water, where $\mathrm{X}$ is equal to

  • A
    10
  • B
    8
  • C
    6
  • Correct answer
    D
    12

Solution

At the lower ends of the tube, the total pressure is due to height of water column in the container plus the height of water in the capillary. $\therefore$ Total pressure is due to $8+4=12 \mathrm{~cm}$ of water.

Hence, the correct answer is option: 'D'.

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