Exam quiz Meteorology - EASA Drone License A2

Question 1

How is 'Density Altitude' best defined in aviation?

Accepted Answer

Pressure altitude corrected for non-standard temperature; it is the altitude the drone 'feels' like it is flying at

Answer

The physical altitude measured by a laser rangefinder

Answer

The altitude of the lowest cloud layer

Answer

The height above the terrain directly below the drone

Question 2

During a clear, calm night in a mountainous area, how does the local wind typically behave?

Accepted Answer

Cold, dense air flows down the mountain slopes into the valleys (katabatic or mountain breeze)

Answer

Warm air rushes up the slopes from the valleys (anabatic breeze)

Answer

The wind blows perfectly horizontal to the peaks

Answer

There is a complete vacuum of air

Question 3

On the Beaufort scale, a Force 5 wind (Fresh Breeze, roughly 17-21 knots) is generally characterized on land by:

Accepted Answer

Small trees in leaf beginning to sway; crested wavelets forming on inland waters. This is often the operational limit for many commercial drones.

Answer

Smoke rising vertically

Answer

Trees being uprooted and structural damage occurring

Answer

Only leaves rustling gently

Question 4

What is a 'Rotor Cloud'?

Accepted Answer

A turbulent, rolling cloud found at the lower levels of a mountain wave system, indicating extreme, hazardous turbulence

Answer

A cloud created by the spinning rotors of a heavy drone

Answer

A harmless, flat cloud found over the ocean

Answer

A cloud formed strictly by industrial pollution

Question 5

Which air mass is physically lighter (less dense) at the same temperature and pressure?

Accepted Answer

Humid air (because water vapour molecules weigh less than the nitrogen and oxygen molecules they replace)

Answer

Dry air

Answer

They have the exact same density

Answer

Cold air

Question 6

What is the difference between an anemometer and a wind vane?

Accepted Answer

An anemometer measures wind speed, while a wind vane indicates wind direction

Answer

An anemometer measures direction, a wind vane measures speed

Answer

They are exactly the same instrument

Answer

An anemometer measures humidity, a wind vane measures pressure

Question 7

What is the difference between a 'Land Breeze' and a 'Sea Breeze'?

Accepted Answer

A sea breeze blows from the water to the land during the day; a land breeze blows from the land to the water at night

Answer

A land breeze brings rain, a sea breeze brings clear skies

Answer

A sea breeze is caused by the moon, a land breeze by the sun

Answer

There is no difference; they both flow in the same direction

Question 8

If you are flying a C2 drone in a city environment under the A2 subcategory, why is the 'Multipath Effect' a significant concern?

Accepted Answer

GNSS/GPS signals bounce off tall buildings, reaching the drone at different times, which can cause erratic position holding, fly-aways, or sudden switches to ATTI mode

Answer

It causes the video feed to display two images

Answer

It drains the remote controller's battery

Answer

It magnifies the noise of the propellers

Question 9

Gliders and certain drones can gain altitude without motor power by flying into 'Thermals'. What characterizes a thermal?

Accepted Answer

A localized column of warm air rising due to convective solar heating of the ground

Answer

A horizontal gust of wind

Answer

A sudden downdraft of cold air

Answer

An area of high atmospheric pressure

Question 10

How does the wind gradient affect a drone descending to land in windy conditions?

Accepted Answer

As the drone descends into slower air near the ground, its aerodynamic lift may suddenly decrease, requiring the pilot to apply more throttle to prevent a hard landing

Answer

The drone will experience a sudden increase in wind speed near the ground

Answer

The wind gradient will push the drone upwards

Answer

It causes the drone's compass to spin

Question 11

The 'Dew Point' is defined as:

Accepted Answer

The temperature to which air must be cooled (at constant pressure) for it to become 100% saturated with water vapour, leading to condensation

Answer

The time of day when dew evapourates

Answer

The altitude where clouds freeze

Answer

The speed at which rain falls

Question 12

A 'Temperature Inversion' in the atmosphere occurs when:

Accepted Answer

The normal decrease of temperature with altitude is reversed, meaning the air gets warmer as you go higher up through the inversion layer

Answer

The temperature remains constant regardless of altitude

Answer

The temperature drops faster than the standard lapse rate

Answer

A cold front turns into a warm front

Question 13

What type of weather is typically associated with the passage of a fast-moving cold front?

Accepted Answer

Sudden development of towering cumulus or cumulonimbus clouds, heavy rain showers, squalls, and potential thunderstorms, followed by a drop in temperature

Answer

Days of continuous, light drizzle

Answer

Clear, completely cloudless skies

Answer

Widespread radiation fog

Question 14

Why is 'Rime Ice' considered highly dangerous to aircraft aerodynamics?

Accepted Answer

It is rough and milky, altering the aerodynamic shape of the airfoil rapidly, destroying lift and increasing drag

Answer

It dissolves the plastic of the drone

Answer

It burns the motors

Answer

It is completely invisible, making it impossible to detect

Question 15

In the METAR 'LIRF 151250Z 32015KT 9999 FEW030 18/10 Q1012', what does '9999' mean?

Accepted Answer

Visibility is 10 kilometers or more

Answer

The wind is blowing at 9,999 knots

Answer

The altimeter setting is 999.9 hPa

Answer

The cloud base is at 99,990 feet

Question 16

Why is 'Clear Air Turbulence' (CAT) particularly dangerous in aviation?

Accepted Answer

It is severe turbulence that occurs in cloudless regions, meaning pilots have no visual warning (like clouds) before encountering it

Answer

It causes sudden rain without warning

Answer

It only happens at night

Answer

It freezes the drone's motors instantly

Question 17

What is 'Buys Ballot's Law' regarding wind and pressure?

Accepted Answer

In the Northern Hemisphere, if you stand with your back to the wind, the area of lower pressure will be to your left

Answer

Wind speed doubles for every 1000 feet of altitude

Answer

Wind always blows directly from South to North

Answer

Hot air is heavier than cold air

Question 18

In a METAR, what does the code 'CB' appended to a cloud group (e.g., SCT030CB) indicate?

Accepted Answer

Cumulonimbus clouds, warning the pilot of potential thunderstorms, severe turbulence, and lightning

Answer

Clear Blue sky

Answer

Cirrocumulus Bands

Answer

Cloud Base

Question 19

Why is knowing the 'Freezing Level' altitude critical for winter drone operations?

Accepted Answer

Flying into visible moisture (clouds/fog) at or above this altitude will result in rapid structural icing, which destroys lift and causes crashes

Answer

It tells the pilot when the battery will shut down

Answer

It determines how fast the drone can fly

Answer

It is where the airspace automatically becomes Class A

Question 20

What is the primary danger of 'Wind Shear' to a drone during takeoff or landing?

Accepted Answer

A sudden loss of airspeed and lift can cause the drone to stall and crash into the ground before the motors can spool up to compensate

Answer

It drains the battery by creating a vacuum

Answer

It causes the drone's compass to lose north

Answer

It cuts the radio signal from the remote

Question 21

In a METAR report, what does the cloud abbreviation 'TCU' stand for?

Accepted Answer

Towering Cumulus; a cloud of significant vertical development that often precedes a cumulonimbus (CB) and indicates strong updrafts

Answer

Thick Cloud Underlayer

Answer

Total Cloud Umbrella

Answer

Thin Cirrus Uplift

Question 22

What causes 'Steam Fog'?

Accepted Answer

Very cold, dry air moving over much warmer water, causing rapid evapouration and immediate condensation

Answer

Warm air moving over a cold snowpack

Answer

Pollution trapped in a city by an inversion layer

Answer

A sudden drop in barometric pressure

Question 23

On a sunny day, which of the following surfaces will absorb heat the fastest and generate the strongest thermal updrafts?

Accepted Answer

A dark asphalt parking lot or a freshly plowed dirt field

Answer

A deep, calm lake

Answer

A dense, green forest

Answer

A snow-covered field

Question 24

What is the 'Lapse Rate'?

Accepted Answer

The rate at which atmospheric temperature decreases with an increase in altitude

Answer

The rate at which the drone's battery depletes

Answer

The speed of the wind at 10,000 feet

Answer

The time it takes for fog to clear

Question 25

What does the acronym TAF stand for, and what is its typical validity period?

Accepted Answer

Terminal Aerodrome Forecast; typically valid for 9 to 30 hours

Answer

Terminal Aviation Forecast; valid for exactly 2 hours

Answer

Temporary Atmospheric Fluctuations; valid for 48 hours

Answer

Traffic And Flight; valid indefinitely

Question 26

In a TAF, what does 'PROB30' mean?

Accepted Answer

There is a 30% probability of the forecasted weather phenomena occurring

Answer

The wind speed will definitely be 30 knots

Answer

Visibility will be 30 metres

Answer

The temperature will drop by 30 degrees

Question 27

In a METAR report, the abbreviation 'GR' indicates the presence of:

Accepted Answer

Hail (from the French 'Grêle')

Answer

Ground Fog

Answer

Gusting Rain

Answer

Gravel storms

Question 28

When checking space weather, what does a Kp-index of 0 to 1 indicate?

Accepted Answer

Extremely calm space weather conditions; optimal for reliable GNSS/GPS reception and compass accuracy

Answer

A severe geomagnetic storm; flying is not recommended

Answer

Total loss of GNSS satellites

Answer

A hurricane is approaching

Question 29

According to the International Standard Atmosphere (ISA), what is the standard temperature at Mean Sea Level?

Accepted Answer

15 °C

Answer

0 °C

Answer

10 °C

Answer

20 °C

Question 30

If you set your altimeter to 'QNE' (1013.25 hPa), what are you measuring?

Accepted Answer

Pressure Altitude (Flight Level), used primarily by aircraft cruising at higher altitudes to ensure safe vertical separation

Answer

True Altitude (Height above mean sea level)

Answer

Absolute Altitude (Height above the ground)

Answer

Density Altitude

Exam simulation Meteorology - EASA Drone License A2

Exam simulation EASA Drone A2 License Meteorology 30 questions on 30 minutes

Exam simulation Meteorology - EASA Drone License A2

Exam simulation EASA Drone A2 License Meteorology 30 questions on 30 minutes

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