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Q: Due to which in a compass instrument magnetic changes occurs?
  • A. Error in instrument
  • B. Error in manipulation
  • C. Error in external influences
  • D. Error in sighting
Correct Answer: Option C - Sources of errors in a compass survey– Errors due to external influences– • Magnetic substances like iron, nickel, cobalt, etc. when brought near a compass deflects its magnetic needle. • The close passage of a high voltage power line should be avoided near the observation point.
C. Sources of errors in a compass survey– Errors due to external influences– • Magnetic substances like iron, nickel, cobalt, etc. when brought near a compass deflects its magnetic needle. • The close passage of a high voltage power line should be avoided near the observation point.

Explanations:

Sources of errors in a compass survey– Errors due to external influences– • Magnetic substances like iron, nickel, cobalt, etc. when brought near a compass deflects its magnetic needle. • The close passage of a high voltage power line should be avoided near the observation point.