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Which instrument is used for estimating the height of an aircraft above sea-level?

Which instrument is used for estimating the height of an aircraft above sea-level?

  • (A) Barometer
  • (B) Altimeter
  • (C) Compass meter
  • (D) Polo meter
  • Altimeter: An altimeter is a flight instrument that is designed to tell an aircraft how high it is above a certain level, which is usually mean sea level. In most aircraft, this is done by a barometric altimeter. This is done by measuring the change in air pressure as you ascend or descend, as air pressure falls in a predictable manner with altitude, and this change is translated into a height reading in feet or meters. To ensure that the altimeter reading is correct above sea level, the pilot must set the local air pressure, which is referred to as QNH, before takeoff.
  • Barometer: While an altimeter is a type of aneroid barometer, a barometer is designed to measure air pressure for weather forecasting purposes, not to provide a direct altitude reading.
  • Compass meter: A magnetic compass indicates direction relative to magnetic north, not altitude.
  • Polo meter: There is no such thing as a "polo meter" for altitude measurement in aviation. Similar terms such as "photometer" or "pyrometer" are used to measure light or temperature, respectively.
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Related MCQs:

 ‘NATO’ is an abbreviation of:

March 18, 2026 No Comments
  • (A) North Atlantic Treaty Organization
  • (B) Non-Aligned Treaty Organization
  • (C) Non-Aligned Trading Organization
  • (D) North American Transport Organization

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