Railways Technical Ability Vibration Analysis Question Bank Vibration Analysis

  • question_answer If the surface tension of water-air interface is 0.073 N/m, the gauge pressure inside a rain drop of 1 mm diameter will be:

    A) \[0.146\,\,\text{N/}{{\text{m}}^{\text{2}}}\]                

    B) \[0.73\,\,\text{N/}{{\text{m}}^{\text{2}}}\]

    C) \[146\,\,\text{N/}{{\text{m}}^{\text{2}}}\]                   

    D) \[292\,\,\text{N/}{{\text{m}}^{\text{2}}}\]

    Correct Answer: D

    Solution :

    \[p\,\,=\,\,\frac{4\sigma }{d}\,\,=\,\,\frac{4\,\,\times \,\,0.073}{1\,\,\times \,\,{{10}^{-\,3}}}\] \[=\,\,292\,\,\text{N/}{{\text{m}}^{\text{2}}}\]

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