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Q: Which of the following is a personal error?
  • A. mistakes in manipulation
  • B. atmospheric refraction
  • C. settlement of tripod or turning points (
  • D. wind vibrations
Correct Answer: Option A - Source of errors–Errors may arise from three sources–(I) Instrument, (II) Personal, (III) Natural Personal error–Error may also arise due to want of perfection of human sight in observing and of touch in manipulating instruments. For example, an error may be there in taking the level reading or reading an angle on the circle of a theodolite such known as personal errors.
A. Source of errors–Errors may arise from three sources–(I) Instrument, (II) Personal, (III) Natural Personal error–Error may also arise due to want of perfection of human sight in observing and of touch in manipulating instruments. For example, an error may be there in taking the level reading or reading an angle on the circle of a theodolite such known as personal errors.

Explanations:

Source of errors–Errors may arise from three sources–(I) Instrument, (II) Personal, (III) Natural Personal error–Error may also arise due to want of perfection of human sight in observing and of touch in manipulating instruments. For example, an error may be there in taking the level reading or reading an angle on the circle of a theodolite such known as personal errors.