Exam quiz Meteorology - EASA Drone Quiz A2

Question 1

If a drone flies upward into a strong Temperature Inversion layer, what unexpected aerodynamic effect might occur?

Accepted Answer

The sudden encounter with warmer, less dense air can cause a noticeable decrease in lift and motor efficiency

Answer

The drone will freeze instantly

Answer

The drone's lift will double

Answer

The propellers will spin backwards

Question 2

What is the primary danger of operating a drone near the 'Anvil' of a cumulonimbus cloud?

Accepted Answer

Severe turbulence, lightning, and large hail can be thrown out of the anvil and fall miles away from the main storm center

Answer

The anvil blocks GPS satellites

Answer

It makes the drone invisible to radar

Answer

The air is too thin to fly in

Question 3

In a METAR report, what does the sky condition 'SCT' (Scattered) mean?

Accepted Answer

Cloud coverage of 3 to 4 oktas (eighths) of the sky

Answer

Cloud coverage of 5 to 7 oktas

Answer

A completely overcast sky

Answer

Sky clear, 0 oktas

Question 4

In a high-pressure system (Anticyclone), the air is generally experiencing 'Subsidence'. What does this mean for the weather?

Accepted Answer

The air is slowly sinking and warming, which inhibits cloud formation and generally leads to clear, stable weather

Answer

The air is rising rapidly, creating severe thunderstorms

Answer

The air is moving horizontally at hurricane speeds

Answer

The air is freezing, causing immediate hail

Question 5

In aviation meteorology, what is the strict distinction between Fog (FG) and Mist (BR)?

Accepted Answer

Fog reduces horizontal visibility to less than 1,000 meters; Mist reduces visibility to between 1,000 and 5,000 meters

Answer

Fog is white, Mist is grey

Answer

Fog only happens in winter; Mist only happens in summer

Answer

There is no official difference

Question 6

In a METAR, how is a completely calm wind reported?

Accepted Answer

00000KT

Answer

CALMKT

Answer

VRB00KT

Answer

NILWIND

Question 7

Which combination of meteorological factors will DECREASE air density the most, thereby significantly reducing a drone's flight performance and lift?

Accepted Answer

High altitude, high temperature, and high humidity

Answer

Low altitude, low temperature, and low humidity

Answer

High pressure, low temperature, and dry air

Answer

Sea level altitude, freezing temperatures, and zero humidity

Question 8

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

Accepted Answer

Thunderstorms in the Vicinity (within 8 to 16 km of the aerodrome reference point)

Answer

Very Clear and Tranquil Skies

Answer

Variable Cloud Thickness Status

Answer

Visibility Cleared To South

Question 9

How does 'Frontal Fog' typically form?

Accepted Answer

When warm rain falls through a layer of colder air near the ground, evaporating and raising the humidity of the cold air to saturation

Answer

By the sudden cooling of the ground on a clear night

Answer

By wind blowing humid air up a mountain slope

Answer

By industrial pollution mixing with snow

Question 10

The troposphere is the lowest layer of the Earth's atmosphere. What is its main characteristic regarding weather?

Accepted Answer

It is where almost all of the Earth's weather phenomena (clouds, rain, storms) take place

Answer

It contains no water vapor

Answer

The temperature consistently increases as you climb higher in it

Answer

It is where the ozone layer is located

Question 11

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 12

Why is Hail (GR) a critical threat to UAS operations?

Accepted Answer

Falling ice stones can physically shatter drone propellers, smash optical sensors, and completely destroy the aircraft in seconds

Answer

It makes the battery overheat

Answer

It causes the compass to reverse

Answer

It increases the drone's lift too much

Question 13

If you are flying a multirotor and experience a sudden, strong updraft from a thermal, what is the expected initial reaction of the drone?

Accepted Answer

The drone will rapidly gain altitude; the flight controller will then reduce motor RPM to compensate and bring it back down to its target altitude

Answer

The drone will pitch forward

Answer

The drone will suddenly drop towards the ground

Answer

The drone will turn off completely

Question 14

An anemometer is an instrument used to measure:

Accepted Answer

Wind speed

Answer

Atmospheric pressure

Answer

Relative humidity

Answer

The altitude of the cloud base

Question 15

What is the primary danger of a microburst to a UAS during flight?

Accepted Answer

It creates a massive, localized downdraft followed by violent horizontal wind shear that can easily overpower the drone's propulsion and force it into the ground

Answer

It causes the drone's battery to freeze

Answer

It permanently magnetizes the drone's compass

Answer

It generates a thermal updraft that pushes the drone above the 120m limit

Question 16

What is 'Relative Humidity'?

Accepted Answer

The ratio of the amount of water vapor actually in the air compared to the maximum amount the air could hold at that specific temperature

Answer

The exact weight of water in the air

Answer

The temperature at which water freezes

Answer

The pressure exerted by water droplets on the drone's frame

Question 17

Which type of cloud is generally associated with steady, continuous, and prolonged precipitation rather than heavy, showery bursts?

Accepted Answer

Nimbostratus

Answer

Cumulonimbus

Answer

Cirrocumulus

Answer

Altocumulus

Question 18

At night near a coastline, how does the local thermal breeze usually flow?

Accepted Answer

From the cooler land to the warmer sea (Land Breeze)

Answer

From the sea to the land (Sea Breeze)

Answer

Parallel to the coastline only

Answer

Straight upwards due to sea evaporation

Question 19

Due to the pressure gradient force, air naturally flows:

Accepted Answer

From areas of high pressure to areas of low pressure

Answer

From areas of low pressure to areas of high pressure

Answer

Directly towards the equator at all times

Answer

Only upwards

Question 20

What characterizes the 'Mature Stage' of a thunderstorm?

Accepted Answer

The presence of both strong updrafts and downdrafts, heavy rain, lightning, and potentially hail

Answer

Only gentle updrafts forming a white, fluffy cloud

Answer

The storm cloud completely evaporating into clear air

Answer

A steady, light drizzle with no turbulence

Question 21

In aviation weather reports, how is a 'Ceiling' defined?

Accepted Answer

The height above the Earth's surface of the lowest layer of clouds reported as 'Broken' (BKN) or 'Overcast' (OVC)

Answer

The maximum altitude a drone can physically reach

Answer

Any cloud layer reported as 'Scattered' (SCT)

Answer

The top of a thunderstorm cloud

Question 22

What is a 'Gust Front'?

Accepted Answer

The leading edge of cool, gusty surface winds originating from a thunderstorm downdraft, often felt before the rain arrives

Answer

The exact center of a high-pressure system

Answer

The leading edge of a warm front moving over the ocean

Answer

A clear, calm area immediately preceding a fog bank

Question 23

The 'friction layer' (or planetary boundary layer), where surface friction significantly slows the wind and causes turbulence, usually extends from the surface up to about:

Accepted Answer

2,000 to 3,000 feet (approx. 600 to 900 meters)

Answer

50 feet (15 meters)

Answer

30,000 feet

Answer

100,000 feet

Question 24

Regarding thunderstorms, which statement about lightning is true and highly relevant to drone pilots?

Accepted Answer

Lightning can strike the ground miles away from the main cumulonimbus cloud (even outside the rain area), posing a lethal threat to the pilot and the drone

Answer

Lightning only strikes directly beneath the darkest part of the cloud

Answer

Drones are completely immune to lightning because they have no direct connection to the ground

Answer

Lightning only occurs when the temperature is above 20°C

Question 25

In a TAF forecast, what does 'PROB40' indicate?

Accepted Answer

There is a 40% probability of the forecasted weather conditions occurring

Answer

Visibility will be 40 miles

Answer

The temperature will reach 40 °C

Answer

Wind will blow exactly at 40 knots

Question 26

Why is 'Clear Ice' (Glaze) considered highly dangerous for aircraft and UAVs?

Accepted Answer

It is heavy, forms a solid, hard-to-remove transparent layer that severely disrupts the aerodynamic shape of the airfoil, reducing lift and increasing weight

Answer

It causes the battery to overheat

Answer

It blinds the optical sensors with bright reflections

Answer

It makes the drone invisible to radar

Question 27

Under what conditions does 'Hoar Frost' form on an aircraft or drone?

Accepted Answer

When the surface of the aircraft is below freezing and below the dew point of the surrounding air, causing water vapor to deposit directly as ice crystals (sublimation)

Answer

When rain freezes immediately upon hitting a warm surface

Answer

When flying through a cloud of supercooled water droplets at 10 °C

Answer

When the drone flies too fast in dry air

Question 28

In a METAR report, what does the code 'FU' stand for?

Accepted Answer

Smoke (from the French 'Fumée'), which can significantly reduce visibility

Answer

Freezing Updrafts

Answer

Funnel Cloud (Tornado)

Answer

Frequent Unstable winds

Question 29

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 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 Quiz A2

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