111 questions
Correct: B)
Explanation: Studies consistently show that approximately 70-80% of aviation accidents involve human error as a primary or contributing factor. This includes errors in judgment, decision-making, situational awareness, and task management. Technical failures account for a much smaller proportion, which is why human factors training is central to aviation safety curricula.
Correct: C)
Explanation: James Reason's Swiss Cheese Model illustrates how accidents occur when multiple layers of defence each have "holes" (latent and active failures) that align simultaneously, allowing a hazard to pass through all layers and cause an accident. Each slice of cheese represents a safety barrier, and an accident results from an error chain — not a single isolated failure.
Correct: B)
Explanation: The percentage composition of atmospheric gases remains constant at approximately 21% oxygen and 78% nitrogen regardless of altitude. What changes with altitude is the partial pressure of oxygen: as total atmospheric pressure decreases, there are fewer oxygen molecules per breath, which is why hypoxia becomes a risk at altitude despite the unchanged percentage.
Correct: C)
Explanation: Nitrogen makes up approximately 78% of the atmosphere and is physiologically inert under normal conditions. However, at high pressures (such as during scuba diving), nitrogen dissolves into body tissues, and rapid decompression can cause nitrogen bubbles to form — the mechanism behind decompression sickness, which is also a concern for pilots who fly shortly after diving.
Correct: C)
Explanation: At 18,000 ft (approximately 5,500 m), atmospheric pressure is roughly 500 hPa — half of the standard sea-level pressure of 1013.25 hPa. This means the partial pressure of oxygen is also halved, severely reducing the oxygen available to the body and making supplemental oxygen mandatory for unpressurised flight above this altitude.
Correct: D)
Explanation: The remaining approximately 1% of the atmosphere is composed of trace gases, primarily argon (about 0.93%), with very small amounts of carbon dioxide, neon, helium, methane, and others. While these gases are present in only tiny amounts, carbon dioxide in particular plays a significant role in the body's respiratory drive and acid-base balance, relevant to hyperventilation physiology.
Correct: C)
Explanation: Carbon monoxide (CO) is produced by incomplete combustion of carbon-containing fuels and is present in cigarette smoke. CO binds to haemoglobin with an affinity approximately 200 times greater than oxygen, forming carboxyhaemoglobin and preventing oxygen transport to tissues. In aviation, CO poisoning is also a risk from exhaust fume ingestion via heating systems, producing symptoms similar to hypoxia.
Correct: C)
Explanation: Red-out occurs during sustained negative g-forces (e.g., in a pushover manoeuvre), which force blood toward the head and eyes. The increased blood pressure in the eye's vessels causes red vision, as the retina is flooded with blood. It is the opposite of grey-out and blackout, which result from positive g-forces draining blood away from the head.
Correct: B)
Explanation: Hyperventilation — breathing too rapidly — causes excessive CO₂ to be expelled, leading to respiratory alkalosis. Symptoms include tingling (especially in the extremities and face), muscle spasms or tetany, dizziness, and disturbance of consciousness. Cyanosis (bluish skin discolouration from low blood oxygen) is a symptom of hypoxia, not hyperventilation, making it the exception here.
Correct: B)
Explanation: Cyanosis — the blue discolouration of lips, fingertips, and nail beds — is a classic sign of hypoxia, caused by deoxygenated haemoglobin in peripheral blood. Other hypoxia symptoms include euphoria, impaired judgement, headache, and loss of coordination. Joint pain is associated with decompression sickness, not hypoxia.
Correct: C)
Explanation: Vision is the sense most sensitive to hypoxia because the retina has extremely high oxygen demands. Night vision is particularly affected first, with rod cell function degrading noticeably even at altitudes as low as 5,000-8,000 ft in the dark. Peripheral vision loss and reduced colour discrimination follow at higher altitudes, making hypoxia especially dangerous for flight.
Correct: D)
Explanation: The body begins to show measurable physiological responses to reduced partial pressure of oxygen at around 7,000 ft, though healthy individuals can usually compensate through increased respiratory rate and cardiac output. Below this altitude, the body maintains adequate oxygenation without significant stress; above it, compensatory mechanisms become progressively taxed.
Correct: C)
Explanation: Above approximately 12,000 ft, the body's compensatory mechanisms — increased breathing rate and heart rate — are no longer sufficient to maintain adequate blood oxygen saturation. Hypoxic symptoms become increasingly apparent and performance degradation is measurable. This is why EASA regulations require oxygen supplementation above 10,000 ft for extended periods, and above 13,000 ft at all times.
Correct: D)
Explanation: Red blood cells (erythrocytes) contain haemoglobin, the iron-containing protein that binds oxygen in the lungs and releases it to tissues throughout the body. Any condition that reduces the number or function of red blood cells — such as anaemia, blood donation, or carbon monoxide poisoning — directly impairs the oxygen-carrying capacity of the blood and increases hypoxia risk at altitude.
Correct: C)
Explanation: Blood platelets (thrombocytes) are small cell fragments that aggregate at sites of vascular injury and initiate the clotting cascade, forming a platelet plug to stop bleeding. They work together with clotting factors to form a stable fibrin clot. This function is distinct from the oxygen transport role of red blood cells and the immune role of white blood cells.
Correct: B)
Explanation: White blood cells (leucocytes) are the cellular components of the immune system, defending the body against infections, foreign substances, and abnormal cells. They include lymphocytes, neutrophils, and monocytes, each with specialised roles. A pilot suffering from an active infection — indicated by elevated white blood cell count — may experience impaired cognition and should not fly until recovered.
Correct: C)
Explanation: Thrombocytes (platelets) are the primary agents of haemostasis — the process of stopping bleeding. They aggregate rapidly at injury sites and release chemical signals that activate the full coagulation cascade. Without adequate platelet function, even minor injuries can lead to excessive blood loss. This is relevant to pilots on anticoagulant medications, which require medical assessment.
Correct: B)
Explanation: Scuba diving is a risk factor for decompression sickness (not hypoxia), due to nitrogen dissolving in tissues under high pressure and forming bubbles during ascent. Blood donation reduces red blood cell count (increasing hypoxia risk), smoking causes CO binding to haemoglobin (reducing oxygen transport), and menstruation can cause anaemia over time. Diving itself does not directly cause hypoxia at altitude.
Correct: C)
Explanation: A passenger feeling unwell in flight may be experiencing motion sickness, discomfort from temperature, or mild physiological stress. Adjusting cabin temperature to a comfortable level and minimising bank angle (reducing vestibular and acceleration stimuli) addresses the most likely causes without introducing new risks. Excessive bank aggravates motion sickness, and unnecessary oxygen administration can cause hyperventilation in some individuals.
Correct: C)
Explanation: A reflex is an involuntary, stereotyped neural response to a specific sensory stimulus, mediated through a reflex arc in the spinal cord or brainstem without conscious brain involvement. In aviation, understanding reflexes matters because some trained responses can become automatic (procedural memory), while unexpected reflexes — such as startle responses — can interfere with controlled aircraft handling in emergencies.
Correct: D)
Explanation: The autonomic nervous system (ANS) regulates involuntary physiological functions including heart rate, breathing rate, digestion, and glandular secretion. It has two branches: the sympathetic ("fight or flight") and parasympathetic ("rest and digest") systems. In high-stress flight situations, sympathetic activation increases heart rate and alertness but can also impair fine motor control and narrow attentional focus.
Correct: D)
Explanation: Parallax error occurs when an instrument is read from an angle rather than directly face-on, causing the observer's line of sight to pass through the needle or pointer at an offset, giving a false reading. This is particularly relevant for analogue instruments with a gap between the pointer and the scale face. Pilots should always read instruments from directly in front to avoid this systematic error.
Correct: C)
Explanation: Pilots must use non-polarised sunglasses because polarised lenses eliminate horizontally reflected light, which can make LCD displays, glass cockpit instruments, and certain reflective surfaces — such as water or other aircraft — invisible or severely distorted. UV protection and good optical quality are desirable, but the non-polarised requirement is the safety-critical aviation-specific characteristic.
Correct: C)
Explanation: The Eustachian tube (auditory tube) connects the middle ear to the nasopharynx, allowing pressure equalisation between the middle ear cavity and the external environment. During altitude changes, it opens (usually when swallowing or yawning) to prevent the pressure differential that causes ear pain (barotitis media). Blockage due to congestion from a cold makes pressure equalisation impossible and can cause severe pain or eardrum rupture.
Correct: C)
Explanation: When the Eustachian tube is blocked — typically due to a cold, sinus infection, or allergic congestion — the mucous membrane swells and prevents the tube from opening. This traps air in the middle ear at the previous ambient pressure, creating a painful pressure differential during ascent or descent. Pilots are advised not to fly with upper respiratory infections for this reason.
Correct: B)
Explanation: This is the "leans" or graveyard spiral illusion, rooted in semicircular canal adaptation. During a prolonged coordinated turn, the fluid in the relevant semicircular canal adapts to the rotation and ceases sending turn signals. When the pilot levels the wings, the canal detects a rotation in the opposite direction, creating the false sensation of turning the other way — which can cause a pilot to re-enter the original bank.
Correct: A)
Explanation: Motion sickness is triggered by conflicting sensory signals — typically between the visual system and the vestibular (balance) system. Constant, non-accelerated straight-and-level flight produces no vestibular stimulation and no sensory conflict, so it does not provoke motion sickness. Head movements during turns, turbulence, and alcohol (which alters endolymph density) all create or amplify sensory conflicts.
Correct: B)
Explanation: A runway that slopes upward away from the pilot appears shorter and steeper than a flat runway, giving the visual impression of being higher than the actual glide slope. The pilot, perceiving the approach as too high, instinctively descends below the correct approach path — creating a dangerous undershoot risk. This illusion is a well-documented cause of controlled flight into terrain (CFIT) on visual approaches.
Correct: B)
Explanation: Note: this question asks about the impression (what the pilot feels), not the actual outcome. An upsloping runway makes the pilot feel too high, so they perceive an overshoot situation. In response, the pilot may descend below the correct glide path, which in reality leads to an undershoot — but the perceived impression driving that incorrect correction is of being too high and overshooting.
Correct: C)
Explanation: Vertigo (specifically the Coriolis illusion) is most likely when the head is moved in a different plane during an ongoing turn. The semicircular canals are already stimulated by the turn, and adding a head movement (such as looking down at a chart) stimulates a second set of canals simultaneously, creating an overwhelming and disorienting sensation of tumbling or rotation. This is one of the most incapacitating spatial disorientation illusions.
Correct: B)
Explanation: Grey-out is a progressive loss of colour vision and peripheral vision caused by positive g-forces pulling blood away from the head toward the lower body. As blood pressure in the retinal arteries drops, the retina (which has the highest oxygen demand of any body tissue) first loses colour perception (grey-out), then vision altogether (blackout), and finally consciousness (G-LOC — g-induced loss of consciousness).
Correct: B)
Explanation: Visual illusions occur because the brain actively constructs perception based on prior expectations, patterns, and assumptions rather than passively recording reality. When environmental cues are ambiguous, incomplete, or unusual (as is common in aviation — unfamiliar terrain, unusual lighting, featureless sky), the brain fills in gaps with "best guesses" that can be dangerously wrong. Recognising this active interpretive process is key to mitigating illusion risk.
Correct: D)
Explanation: The liver metabolises alcohol at a roughly constant rate of approximately 0.01% (0.1 g/L) blood alcohol concentration per hour, largely independent of body weight or the amount consumed. This means that after a night of drinking, significant alcohol impairment can persist well into the following day. EASA regulations prohibit flying with a blood alcohol level above 0.2 g/L, and the "8-hour bottle to throttle" rule is a minimum — not a guarantee of sobriety.
Correct: B)
Explanation: Overweight and obesity are the primary modifiable risk factors for type 2 diabetes, as excess adipose tissue — particularly visceral fat — causes insulin resistance. Type 2 diabetes is a significant concern in aviation medicine because it can cause hypoglycaemic episodes that impair consciousness and cognitive function, and because many diabetes medications are incompatible with a medical certificate.
Correct: B)
Explanation: Scuba diving causes nitrogen to dissolve into body tissues under elevated ambient pressure. If the diver then flies before sufficient off-gassing time has elapsed (typically 12-24 hours depending on dive profile), the reduced cabin pressure causes nitrogen to come out of solution and form bubbles in tissues and blood — decompression sickness ("the bends"). Breathing 100% oxygen after decompression actually accelerates nitrogen elimination and is a treatment, not a risk factor.
Correct: C)
Explanation: George Miller's classic 1956 research established that short-term (working) memory has a capacity of 7 ± 2 chunks of information, retained for approximately 10-20 seconds without active rehearsal. In aviation, this limitation is critically important: ATC clearances, frequencies, and altitudes must be written down immediately because they will be lost from working memory within seconds if not rehearsed or recorded.
Correct: B)
Explanation: Without active rehearsal or encoding, items held in short-term (working) memory fade within approximately 10-20 seconds. This is why read-back procedures in aviation communication are essential — they force the pilot to actively process and repeat information, moving it from passive short-term storage into a more durable encoded state, and simultaneously allow ATC to verify correct receipt.
Correct: C)
Explanation: In James Reason's error model, latent errors (or latent conditions) are failures embedded in the system — poor design, inadequate procedures, organisational pressures, or maintenance shortcuts — that remain dormant and undetected until they combine with an active error to cause an accident. Unlike active errors (committed by front-line operators), latent errors originate at management and design levels and can lie dormant for years.
Correct: D)
Explanation: Situational awareness (SA) — defined by Mica Endsley — is the continuous perception of elements in the environment, comprehension of their meaning, and projection of their future status. It is the foundation of good aeronautical decision-making. Loss of situational awareness (LSA) is a primary contributing factor in controlled flight into terrain, mid-air collisions, and spatial disorientation accidents.
Correct: B)
Explanation: Standardised ICAO radio telephony phraseology ensures that both the sender and receiver use identical, unambiguous codes with pre-agreed meanings, minimising the risk of misunderstanding. In communication theory, this corresponds to ensuring the transmitter and receiver share the same codebook. Errors in radio communication are a well-documented contributing factor in runway incursions and traffic conflicts.
Correct: A)
Explanation: The four standard risk management strategies are: Avoid (eliminate the activity or hazard), Reduce (implement controls to lower probability or severity), Transfer (shift the risk to another party, e.g., insurance), and Accept (consciously acknowledge the residual risk when it is within acceptable limits). Ignoring a risk is never an acceptable strategy in aviation risk management.
Correct: C)
Explanation: Group dynamics can cause "risky shift" — the phenomenon where groups tend to make bolder, riskier decisions than individuals acting alone. Social pressure, the desire to conform, diffusion of responsibility, and the presence of perceived experts can all suppress individual risk awareness. This is a core concept in Crew Resource Management (CRM), where junior crew members may fail to challenge a captain's poor decision.
Correct: A)
Explanation: The FAA identifies five hazardous attitudes in aviation: macho, invulnerability, impulsivity, resignation (self-abandonment), and anti-authority. Macho ("I can do it") and invulnerability ("It won't happen to me") are frequently found together because both stem from overconfidence and underestimation of risk. A pilot who thinks they are immune from accidents (invulnerability) is also prone to taking unnecessary risks to demonstrate skill (macho).
Correct: C)
Explanation: The macho attitude is characterised by the need to demonstrate bravery, skill, or daring — often to an audience. Performing risky manoeuvres to impress observers is a textbook example: the pilot prioritises ego and external validation over safety margins. This attitude is particularly dangerous because it actively creates hazardous situations that would otherwise never arise. The antidote is the reminder: "Taking chances is foolish."
Correct: C)
Explanation: Confirmation bias — the tendency to perceive and interpret information in a way that confirms pre-existing expectations — is a major source of human error in aviation. Pilots may misread an instrument, misidentify a runway, or fail to notice an abnormality because their brain filters incoming information through what it expects to see. This is why structured scan patterns, checklists, and cross-checking are essential countermeasures.
Correct: A)
Explanation: Aviation psychology research identifies extroversion and emotional stability as the most beneficial personality traits for pilots. Extroversion supports effective communication, crew coordination, and assertiveness needed for CRM. Emotional stability (low neuroticism) ensures the pilot remains calm and rational under pressure, maintains consistent performance, and does not overreact to stress — all critical for safe flight operations.
Correct: D)
Explanation: Automation complacency occurs when pilots over-rely on automated systems and progressively reduce their active monitoring of aircraft state. As cockpit automation becomes more sophisticated and reliable, pilots may become less vigilant, lose situational awareness, and suffer skill degradation. When automation fails — precisely when manual flying skills are most needed — the complacent pilot may be unprepared to take over effectively.
Correct: C)
Explanation: The Yerkes-Dodson law describes the inverted-U relationship between arousal (stress) and performance. Point B represents the peak of the curve — the optimal level of arousal where performance is maximised. Too little arousal (Point A: boredom, fatigue) leads to poor performance due to inattention; too much arousal (Points C, D: high stress, panic) degrades performance through tunnel vision, cognitive narrowing, and loss of fine motor control.
Correct: A)
Explanation: Point D represents the far right of the Yerkes-Dodson curve — excessive arousal and stress — where performance collapses. At this level, the pilot is overwhelmed, unable to process information effectively, and may exhibit tunnel vision (fixating on one problem while ignoring others), panic responses, or cognitive freezing. Recognising the signs of overstrain and applying stress management techniques (slowing down, prioritising tasks) is a core CRM skill.
Correct: D)
Explanation: Stress affects all four cognitive functions listed. Under high stress, attention narrows (tunnel vision), concentration becomes difficult to maintain, reaction times are altered (initially faster, then degraded under extreme stress), and memory — particularly working memory retrieval and encoding — is impaired by elevated cortisol and sympathetic activation. This is why emergency procedures must be practiced to the point of automaticity: procedural memory is more stress-resistant than declarative recall.
Correct: C)
Explanation: The proportion of oxygen remains constant at 21% regardless of altitude. It is the partial pressure that decreases.
Correct: C)
Explanation: Smokers already have an elevated CO level in their blood, so hypoxia manifests earlier.
Correct: B)
Explanation: CO is a product of incomplete combustion, odourless and highly toxic (binds to haemoglobin).
Correct: C)
Explanation: Full dark adaptation (scotopic vision) takes approximately 30 minutes.
Correct: B)
Explanation: Hypotension can cause dizziness, particularly during changes of posture (orthostatic hypotension).
Correct: C)
Explanation: At 20,000 ft without oxygen, the time of useful consciousness (TUC) is very short — rapid loss of consciousness occurs.
Correct: C)
Explanation: During descent, external pressure increases and air cannot equalise within the blocked sinuses.
Correct: D)
Explanation: Motion sickness manifests as dizziness, sweating, nausea and possibly vomiting.
Correct: D)
Explanation: Wide runway = impression of being lower/slower than in reality (visual illusion). The pilot tends to fly too high.
Correct: C)
Explanation: Greyout affects the eyes (retina) first as they are the most sensitive to reduced blood supply.
Correct: B)
Explanation: Correct technique: systematic sector-by-sector scan with a pause on each sector.
Correct: C)
Explanation: The body eliminates alcohol at approximately 0.1 to 0.15 per mille per hour. Value used for examination purposes: 0.1 per mille/h.
Correct: C)
Explanation: Lack of physical exercise is a recognised cardiovascular risk factor.
Correct: C)
Explanation: Amphetamines are strictly prohibited for pilots on duty (dangerous side effects).
Correct: C)
Explanation: "Risk area awareness" = awareness of the risks associated with each phase of flight.
Correct: B)
Explanation: DECIDE: Detect, Estimate, Choose, Identify, Do, Evaluate. The D = Detect (detect the change).
Correct: B)
Explanation: Hazardous attitudes (anti-authority, macho, invulnerability, resignation, impulsivity) can be recognised and corrected.
Correct: C)
Explanation: Selective attention = focusing on one task at the expense of other stimuli (e.g. an alarm goes unheard).
Correct: C)
Explanation: Yerkes-Dodson curve: an optimal level of stress (eustress) improves performance.
Correct: C)
Explanation: The endogenous circadian rhythm is approximately 25 hours (reset daily by light).
Correct: B)
Explanation: For motion sickness, getting fresh air is the most effective remedy. Looking through portholes can worsen it, and head movements also aggravate motion sickness. Fresh air stabilizes the autonomic nervous system.
Correct: A)
Explanation: A pilot trained on narrow runways, facing a wide runway, will have the illusion of being lower above the runway than in reality (height underestimation). This can lead to a flare too high.
Correct: A)
Explanation: Middle ear pressure problems occur most often during rapid descent, as the Eustachian tube must compensate for increasing external pressure. It opens more easily during ascent.
Correct: B)
Explanation: The proportion of oxygen in the atmosphere remains approximately 21% regardless of altitude (the atmosphere is homogeneous in composition up to 80 km). What changes is the partial pressure of O2, which decreases with altitude.
Correct: C)
Explanation: Carbon monoxide (CO), even in low concentrations, binds to hemoglobin (200x stronger than O2) and can cause total incapacitation very rapidly. It is extremely dangerous.
Correct: C)
Explanation: A helmet with earphones is the most effective hearing protection as it covers the entire ear and attenuates the most harmful frequencies. Cotton wool and earplugs are less effective.
Correct: B)
Explanation: Legumes (beans, peas, lentils) produce intestinal gas. At high altitude, these gases expand (Boyle's law) and can cause severe abdominal pain.
Correct: B)
Explanation: Somatic cells absorb oxygen (O2) and release carbon dioxide (CO2) during cellular metabolism (cellular respiration). This process releases energy stored in nutrients.
Correct: C)
Explanation: Cigarette smoke contains carbon monoxide (CO), which binds to hemoglobin. This reduces oxygen-carrying capacity, so the pilot will feel oxygen deficiency at a lower altitude than if they had not smoked.
Correct: B)
Explanation: The risk of dizziness is greatest when rotating the head during a coordinated turn. The semi-circular canals are already stimulated by the turn; a head movement in a perpendicular plane stimulates canals in a different plane, causing vertigo (Coriolis illusion).
Correct: D)
Explanation: To better withstand positive g-forces, the pilot should contract abdominal and leg muscles and perform forced breathing (L-1 maneuver). This increases abdominal pressure and delays g-LOC.
Correct: C)
Explanation: Impairment of judgment and concentration is the most dangerous effect of oxygen deficiency because the pilot does not realize they are incapable. Physical signs (tingling, cyanosis) often appear too late.
Correct: B)
Explanation: The blood alcohol elimination rate is approximately 0.1 per mille per hour and depends only on time. Neither coffee, oxygen, nor the type of drink can significantly accelerate it.
Correct: B)
Explanation: When visual references are lost, proprioception (deep sensitivity) can give a false perception of position. It cannot replace visual references or instruments for maintaining spatial orientation.
Correct: C)
Explanation: High blood pressure does not directly affect visual acuity in normal flight. However, oxygen deficiency, alcohol, and carbon monoxide directly reduce visual acuity.
Correct: C)
Explanation: A healthy human body can compensate for oxygen deficiency by increasing heart rate and breathing rate up to approximately 10,000-12,000 ft. Beyond this, these compensation mechanisms are insufficient.
Correct: C)
Explanation: Even over-the-counter medications (aspirin, antihistamines, decongestants) can have side effects affecting flight fitness: drowsiness, reduced reflexes, blurred vision. A doctor should always be consulted.
Correct: C)
Explanation: A linear forward acceleration in horizontal flight is interpreted by the vestibular system as a climb, causing the somatogravic illusion. The otoliths cannot distinguish between gravitational and linear acceleration vectors.
Correct: C)
Explanation: To avoid vestibular vertigo in a turn, the best measure is to keep the head still during the turn. Head movements create the Coriolis illusion.
Correct: D)
Explanation: Cigarette smoke inhalation slows oxygen transport in the blood (CO binds to hemoglobin). It does not increase CO2 (which is a cellular waste product).
Correct: C)
Explanation: Oxygen deficiency can reduce visual acuity, especially night vision (rods) and contrast perception. This affects vision both day and night.
Correct: B)
Explanation: The only symptom that always indicates oxygen deficiency (not hyperventilation) is cyanosis: blue lips and fingernails. This objective physical sign cannot be caused by hyperventilation.
Correct: C)
Explanation: The proportion of oxygen in the atmosphere remains at 21% at all altitudes up to the stratosphere. What decreases is the partial pressure of oxygen, not its proportion.
Correct: C)
Explanation: When all visual references are lost, spatial orientation using only cutaneous senses and proprioception is impossible. Without instruments, a pilot in IMC loses spatial orientation within seconds.
Correct: B)
Explanation: In a piston-engine aircraft, carbon monoxide (CO) poisoning from a defective exhaust system is the most likely and dangerous. CO is odorless, colorless and undetectable without a detector.
Correct: C)
Explanation: A correct approach to a strongly upsloping runway gives the impression of being too high on approach. The runway slope deceives the visual system.
Correct: D)
Explanation: At high altitude, gases expand (Boyle's law). Gas-forming foods produce gases that expand and can cause severe abdominal pain.
Correct: C)
Explanation: Red blood cells (erythrocytes) primarily transport oxygen via hemoglobin. Other blood components do not have this primary function.
Correct: D)
Explanation: After a long coordinated turn, the vestibular system adapts to the turn. When the pilot returns to straight flight, they feel they are no longer turning (graveyard spiral illusion).
Correct: B)
Explanation: At high altitude, oxygen deficiency amplifies the effects of alcohol. Reduced O2 partial pressure + increased CO2 from alcohol = multiplier effect on the CNS.
Correct: C)
Explanation: The correct night vision technique is to look slightly off-center (peripheral vision / rods). Central vision (cones) is less sensitive in darkness.
Correct: A)
Explanation: For middle ear pressure problems: stop the descent, climb if possible until pain subsides, then descend at a slower rate (gradual decompression).
Correct: C)
Explanation: Difficulty concentrating is an early symptom of oxygen deficiency. The other symptoms mentioned (joint pain, pulmonary pain, slowed heart rate) are not characteristic.
Correct: B)
Explanation: Motion sickness results from irritation of the balance organ (inner ear / vestibule) due to conflicts between visual and vestibular information.
Correct: D)
Explanation: Anti-motion-sickness medications (antihistamines, scopolamine) often have side effects: drowsiness and slowed reaction time. This makes them dangerous for flying.
Correct: C)
Explanation: Noise-induced hearing loss depends on both the duration AND intensity of the noise. It is the sound dose (dB x time) that is determinant.
Correct: A)
Explanation: Sequence of symptoms with increasing positive Gs: 1) loss of color vision (grey-out), 2) peripheral vision reduction, 3) total vision loss (blackout), 4) loss of consciousness (G-LOC).
Correct: C)
Explanation: The body begins to compensate for oxygen deficiency by accelerating breathing rate at approximately 6000-7000 ft. Below this, compensation is not necessary.
Correct: D)
Explanation: Stress commonly arises when a pilot perceives a threat or problem for which no satisfactory solution is apparent — this is the core definition of the stress response. Individual reactions to stress vary significantly depending on personality, experience, and coping strategies, making option A incorrect. Training and experience are proven to raise the stress threshold and reduce the frequency and severity of stress reactions, making option D wrong. Stress is directly relevant to flight safety, so option B is also incorrect.
Correct: C)
Explanation: The primary duty of any pilot is to aviate — maintain aircraft control and a stable flight path. Only once the aircraft is under control should the pilot attend to any secondary problem. Attempting to solve a problem while neglecting aircraft control (options A, B, C) risks losing situational awareness or aircraft control. Option D correctly prioritises flying first, then problem-solving, while continuously monitoring the aircraft.
Correct: C)
Explanation: Hyperventilation can be triggered by stress, anxiety, or excessive conscious breathing. It leads to a CO2 deficiency (hypocapnia), not an excess. Symptoms resemble oxygen deficiency.
