Multiple choice

An open ended steel barrel of 1 m height and 1 m diameter is filled with saturated fine sand having coefficient of permeability of 10−2m/ s. The barrel stands on a saturated bed of gravel. The time required for the water level in the barrel to drop by 0.75 m is

  1. 58.9 s

  2. 75 s

  3. 100 s

  4. 150 s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 $k = 10^{-2}m/s \\ \text{time required for water level drop by 0.75} \\ = \frac{0.75m}{10^{-2}m/s} = 75 s.$

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