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      Question

      The zero level from which the land elevations and sea

      depths are measured in surveying in India is called
      A contour level Correct Answer Incorrect Answer
      B vertical level Correct Answer Incorrect Answer
      C index level Correct Answer Incorrect Answer
      D datum level Correct Answer Incorrect Answer

      Solution

      The mean value of the low spring tide water mark near Chennai is reckoned as the mean sea level in India. It serves as datum level i.e. the base or zero level from which the land elevations and sea depths are measured.

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