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METEOROLOGY — CH.23

Met InstrumentsAviation Meteorology — DGCA CPL practice questions

Question 1 of 10

Pressure is measured in units of

A.Knots
B.Hectopascal (hPa) or Millibar (mb)
C.Percentage (%)

All 10 questions — Met Instruments

Aviation Meteorology · DGCA CPL. The correct option is marked on each.

  1. Q1. Pressure is measured in units of

    • A.Knots
    • B.Hectopascal (hPa) or Millibar (mb)✓
    • C.Percentage (%)

    Why: Atmospheric pressure is expressed in hectopascals.

  2. Q2. Minimum temperature is measured by

    • A.Mercury thermometer
    • B.Alcohol thermometer✓
    • C.Aneroid thermometer

    Why: Minimum thermometer uses spirit with an index that records the lowest reading.

  3. Q3. Relative Humidity is measured by

    • A.Barograph
    • B.Hygrometer / Psychrometer✓
    • C.Anemometer

    Why: Humidity is measured with a hygrometer/wet-and-dry-bulb psychrometer.

  4. Q4. Cloud base is measured by

    • A.Hygrograph
    • B.Ceilometer / Ceilograph / Ceiling Balloon✓
    • C.Anemograph

    Why: Cloud base/ceiling is measured by ceilometer, ceilograph or ceiling balloon.

  5. Q5. Upper air pressure, temperature and humidity are measured by

    • A.Optical Theodolite
    • B.Radiosonde / Dropsonde✓
    • C.AVRA

    Why: A balloon-borne radiosonde measures upper-air pressure, temperature and humidity.

  6. Q6. Upper winds are measured by

    • A.Radiosonde
    • B.Radar Wind (RAWIN) / Optical Theodolite / Pilot Balloon✓
    • C.Ceilometer

    Why: Upper winds are found by tracking a pilot balloon with theodolite or radar.

  7. Q7. Visibility / RVR is measured by

    • A.Wind Vane
    • B.Transmissometer / Scopograph / Forward Scatterometer✓
    • C.Nephroscope

    Why: RVR/visibility is measured by transmissometer or forward-scatter sensor.

  8. Q8. Surface wind direction is reported from True North in which direction?

    • A.Anticlockwise
    • B.Clockwise✓
    • C.From South

    Why: Wind direction is measured clockwise from True North.

  9. Q9. Humidity Mixing Ratio is measured in

    • A.%
    • B.gm/kg✓
    • C.hPa

    Why: Mixing ratio is grams of water vapour per kilogram of dry air.

  10. Q10. Dropsonde is used in

    • A.Mountain areas
    • B.Cyclones (dropped from aircraft)✓
    • C.Upper atmosphere research

    Why: A dropsonde is released from an aircraft to profile cyclones/data-sparse seas.