Demo: SPL

Correct: Falling pressure in front of the warm front, constant pressure within the warm sector, rising pressure behind the cold front. Before the warm front, pressure drops; in the warm sector, it stays steady; behind the cold front, it rises. The other options do not match the typical pattern of a polar front low.

Correct: Veering wind during passage of the warm front, veering wind during passage of the cold front. In Central Europe, wind turns clockwise (veers) with both fronts. The other options are wrong because they mention backing or a mix, which is not meteorologically correct.

Around an upper-level trough, showers and thunderstorms (Cb) are likely, as cold air aloft causes instability. The other options describe calm or stable weather, which is not typical for upper-level troughs.

In high pressure areas during summer, large isobar spacing means weak winds and local wind systems often form. The other options are incorrect because they mention strong winds or small isobar spacing, which are not typical for high pressure areas.

Large distances between isobars mean a weak pressure gradient, so winds are usually light, variable, and local wind systems can form. Strong prevailing winds or rapid changes occur with closely spaced isobars, not wide ones.

Correct: Layered clouds, mountains obscured, poor visibility, moderate or heavy rain. On the windward side, moist air rises, cools, and condenses, causing thick clouds and rain. The other options describe the leeward side or are incorrect for the windward side.

The highest risk of icing occurs between 0°C and -12°C with supercooled water droplets in clouds. The other options are incorrect because they are either too cold, too warm, or lack supercooled droplets, which are essential for ice accretion.

The range from 0°C to -12°C is most dangerous because supercooled water droplets freeze most easily on aircraft surfaces. The other ranges are less critical, as less icing-prone water is present at those temperatures.

The main danger from lightning is surface overheating and damage to exposed aircraft parts, as the current passes through the skin. Disturbed radio, equipment explosions, or rapid depressurization are rare or less likely.

The surface weather chart displays pressure patterns and frontal positions at ground level. Hypsometric, wind, and SWC charts do not provide this ground-level information.

A radar picture shows areas of precipitation because radar detects reflections from raindrops or snow. Satellite pictures show clouds, not direct precipitation. GAFOR is for flight weather, not precipitation. Wind charts only show wind direction and speed.

ATIS broadcasts current weather and operational information for a specific airport. VOLMET gives weather for several airports, PIREP are pilot reports, SIGMET warns of hazardous weather. Only ATIS provides targeted info for the destination aerodrome.

Widely spaced isobars mean low pressure gradients, resulting in weak prevailing winds. Closely spaced isobars indicate strong pressure gradients and strong winds. So, only the answer with low pressure gradients and low wind is correct.

Solar irradiation on the windward side intensifies updrafts because it heats the air, causing it to rise more strongly. Solar irradiation on the lee side, nighttime thermal radiation, or warming of upper layers do not have this effect.

The correct answer is: When no radio communication can be established with the appropriate aeronautical station, but there is evidence that transmissions are received. This is called a blind transmission. The other options describe different radio situations, not blind transmissions.

The correct abbreviation for Visual Flight Rules is VFR. VMC means Visual Meteorological Conditions, VRU and VFS are not recognized aviation abbreviations. Only VFR refers to the rules for flying by visual reference.

'OBST' is the correct abbreviation for 'obstacle'. 'OBS', 'OST', and 'OBTC' are not official abbreviations for this term in aviation. Only 'OBST' is used in charts and documents.

The correct answer is 'Flight Information Service' because FIS refers to this service, which provides pilots with important information during flight. The other options mention flashing or systems that do not exist in aviation.

The correct answer is 'Flight Information Region' because FIR refers to a defined airspace for flight information services. The other options do not relate to airspace or flight information and are incorrect.

'H24' stands for 24 h service, meaning continuous operation day and night. The other answers are incorrect because they refer only to certain times of day or unspecified hours, which does not match the meaning of H24.

'HX' means there are no specific opening hours. The other options refer to fixed time periods or continuous 24 h service, which is not correct here.

QFE is the air pressure at the airfield. Setting the altimeter to QFE makes it read zero on the ground. QNH shows altitude above sea level, QNE is standard pressure, QTE is not used. Only QFE gives zero on the ground.

With QFE set, the altimeter shows altitude above the airfield, i.e., in relation to the air pressure at the reference airfield. The other options are incorrect as they refer to standard pressure, sea level, or terrain, which do not apply to QFE.

A flight safety message is used for air traffic control because it contains safety-relevant information. Messages related to direction finding, flight regularity, and meteorological messages serve other purposes and are not specifically for air traffic control.

Correct: Distress messages concern aircraft and their passengers facing grave and imminent danger needing immediate help. The other options refer to general safety, operational, or maintenance messages, not emergencies requiring urgent assistance.