Demo: BPL/G

The correct answer is 1.0 m, as tears longer than 1.0 m must be repaired by an approved aeronautical workshop. Shorter tears can be repaired by the owner. 0.5 m, 2.0 m, and 5.0 m are either too short or too long and do not match the regulations.

Damages at the basket ropes must be fixed by an Approved Aeronautical Workshop, as this ensures safety and compliance. The pilot or temporary fixes are not allowed, and waiting until the next inspection is unsafe.

The correct answer is 'Altitude 9500 ft MSL' because the NOTAM specifies the altitude in feet above mean sea level (MSL). The other options are incorrect as they refer to meters, flight level, or height above ground, which do not apply here.

For cross-border flights, filing a flight plan is required so authorities are informed. The other options are not generally mandatory or relate to different situations.

The correct symbol for a general spot elevation according to ICAO is symbol C. This symbol shows a small number with a dot below it. The other symbols represent different map features and not spot elevations.

QFE is the barometric pressure at a reference datum, typically the runway threshold. The other options refer to sea level pressure, altitude above 1013.25 hPa, or magnetic bearing, which do not define QFE.

The altimeter subscale is used to reference the altimeter reading to a specific pressure level, such as mean sea level, aerodrome level, or standard pressure (1013.25 hPa). The other options are incorrect because the subscale does not adjust for temperature or system errors.

If the subscale is set to a higher than actual pressure, the altimeter shows too high. The aircraft is closer to the ground than indicated. The other answers confuse the effect or describe the opposite situation.

A lower-than-standard temperature causes the altimeter to indicate too high. This is because denser air makes the altimeter overread. The other options are incorrect: they either state the opposite, suggest perfect correction, or confuse with Pitot tube issues, which do not affect the altimeter.

True altitude is an altitude above mean sea level corrected for non-standard temperature and QNH. This gives the actual height above sea level. The other options refer only to ground level, pressure, or temperature, which is incorrect.

Altitude measurement is based on static pressure, which decreases as altitude increases. Total, dynamic, and differential pressures are used for other instruments like the airspeed indicator, not the altimeter.

Correct: The vertical speed indicator measures the rate of change of static pressure by comparing current static pressure with that inside a reservoir. The other options are incorrect: they mention total pressure, vacuum, or acceleration, which are not how the instrument works.

The vertical speed indicator measures the difference between the present static pressure and the static pressure of a previous moment. This shows climb or descent rate. The other options are incorrect because they refer to dynamic or total pressure, which are not used by the VSI.

Static pressure is the pressure of undisturbed airflow, meaning the ambient air pressure unaffected by movement. Cabin pressure is unrelated. Pressure from orderly flow is dynamic pressure. The pitot tube measures total, not just static, pressure.

With the altimeter set to QFE, it shows height above the airfield. The other options are incorrect: they refer to elevation above sea level, pressure altitude, or the airfield's elevation, not the height above the airfield.

A too big equalizing tank causes the vertical speed indicator to show too high values, as the larger volume amplifies pressure changes. The other options are wrong: the instrument still works, is not overloaded, and does not show too low values.

Correct: The VSI measures the difference between instantaneous static pressure and previous static pressure, indicating vertical speed. The other options mention total or dynamic pressure, which are not used by the VSI.

Wearing strips protect the basket during landing as they are attached to the bottom and absorb impact. Rubber pads, steel runners, and wheels are not used on balloons and do not protect the basket.

The drag lines transfer the force from the pull rope to the parachute, allowing it to open when pulled. The other answers are incorrect because they describe wrong functions or refer to other balloon parts.

Propane is heavier than air because its density is higher. Helium and hydrogen are much lighter than air. Illuminating gas is usually a mixture that is also lighter than air. Therefore, only propane is heavier than air.

Hydrogen contains no carbon atoms, only hydrogen atoms. Methane, propane, and butane are hydrocarbons because they are made of both carbon and hydrogen atoms.

The towing cord of a gas balloon is on the rip panel side, as this allows for quick deflation in emergencies. The sandpourer, sliding, and entry sides are not related to the towing cord's function.

The correct answer is 0.2 kg/m³, as helium's density under standard conditions is about 0.1785 kg/m³. 2 kg/m³ and 0.2 g/m³ are much too high or too low, and 0.02 g/m³ is also too low. Only 0.2 kg/m³ is close to the correct value.

The appendix-pull close rope is used to close the filling nozzle (appendix) of a gas balloon, preventing gas from escaping. It does not close the sand disposer, secure the trail rope, or close the emergency opening.

The emergency release is located beside the filling nozzle, allowing quick gas release in emergencies. The other options (upper pole, equator, side of the valve) are not used for emergency openings.