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Sample CPL Human Performance Practice Questions

Try these sample questions to review concepts for the CPL Human Performance exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following gas laws states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas?
A.Dalton's Law
B.Boyle's Law
C.Henry's Law
D.Charles's Law
Explanation: Dalton's Law states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases. In aviation physiology, this explains why the partial pressure of oxygen (PO2) decreases as altitude increases, even though the fractional composition of oxygen remains constant at approximately 21 percent.
2Which gas law explains the expansion of trapped gases in the human body (such as in the middle ear, sinuses, and gastrointestinal tract) during a climb?
A.Henry's Law
B.Charles's Law
C.Boyle's Law
D.Dalton's Law
Explanation: Boyle's Law states that the volume of a gas is inversely proportional to its pressure at a constant temperature. During a climb, ambient pressure decreases, causing the volume of any trapped gases in body cavities to expand, potentially causing barotrauma if the pressure cannot equalize.
3Decompression sickness, where dissolved nitrogen forms bubbles in body tissues and blood during a rapid ascent, is governed by which gas law?
A.Henry's Law
B.Graham's Law
C.Boyle's Law
D.Charles's Law
Explanation: Henry's Law states that the mass of a gas dissolved in a given volume of liquid is directly proportional to the partial pressure of that gas. During rapid decompression or ascent, the partial pressure of nitrogen decreases, causing nitrogen to come out of solution and form physical bubbles in the blood and joints.
4What is the typical Time of Useful Consciousness (TUC) for a pilot following a rapid decompression at an altitude of 25,000 feet?
A.10 to 15 minutes
B.3 to 5 minutes
C.30 to 45 seconds
D.1 to 2 minutes
Explanation: At 25,000 feet, the Time of Useful Consciousness (TUC) is typically 3 to 5 minutes under normal conditions. Following a rapid decompression, this time can be cut in half due to the rapid expansion of air in the lungs forcing oxygen out (the lung-collapse effect).
5Hypoxic hypoxia, the most common form of hypoxia in aviation, is defined as a deficiency in oxygen delivery to body tissues caused by:
A.A reduction in the oxygen-carrying capacity of the blood due to low hemoglobin levels
B.An inability of body cells to utilize oxygen due to cellular poisoning
C.Insufficient blood flow or circulation, preventing oxygen from reaching target tissues
D.A reduction in the partial pressure of oxygen in the inspired air at high altitudes
Explanation: Hypoxic hypoxia occurs when there is an insufficient partial pressure of oxygen in the lungs, typically due to the low atmospheric pressure at high altitudes. This prevents the normal diffusion of oxygen across the alveolar-capillary membrane into the blood.
6Which type of hypoxia is caused by carbon monoxide poisoning, where hemoglobin binds to carbon monoxide instead of oxygen?
A.Anaemic hypoxia
B.Stagnant hypoxia
C.Histotoxic hypoxia
D.Hypoxic hypoxia
Explanation: Anaemic hypoxia occurs when the blood's oxygen-carrying capacity is reduced, even though there is sufficient oxygen pressure in the lungs. Carbon monoxide has an affinity for hemoglobin that is 200 to 250 times greater than that of oxygen, forming carboxyhemoglobin and preventing oxygen transport.
7High positive Gz acceleration in a turn causes blood to pool in the lower limbs, leading to a loss of vision and potential unconsciousness. Which type of hypoxia does this induce?
A.Histotoxic hypoxia
B.Stagnant hypoxia
C.Anaemic hypoxia
D.Hypoxic hypoxia
Explanation: Stagnant hypoxia occurs when blood circulation to a tissue is reduced or stopped. High positive Gz forces pull blood away from the head towards the lower abdomen and legs, restricting arterial blood supply to the brain and eyes, which leads to gray-out, black-out, and ultimately G-LOC.
8Consuming alcohol before a flight can prevent cells in brain tissue from utilizing the oxygen delivered to them. This condition represents which type of hypoxia?
A.Hypoxic hypoxia
B.Stagnant hypoxia
C.Histotoxic hypoxia
D.Anaemic hypoxia
Explanation: Histotoxic hypoxia is the inability of cells to utilize oxygen because they have been poisoned by toxins. Alcohol, cyanide, and narcotics interfere with the respiratory enzymes in the cell, preventing them from using the oxygen delivered by the blood.
9Hyperventilation, which is often triggered by anxiety, fear, or stress, causes which of the following physiological changes in the blood?
A.A decrease in the partial pressure of carbon dioxide, leading to respiratory alkalosis
B.An increase in oxygen content, leading to oxygen toxicity of the brain
C.An accumulation of nitrogen bubbles, causing joint pain
D.An increase in carbon dioxide concentration, leading to respiratory acidosis
Explanation: Hyperventilation is breathing in excess of the body's metabolic needs. This expels excessive amounts of carbon dioxide, causing hypocapnia (low arterial PCO2). The reduction of carbon dioxide raises blood pH, leading to respiratory alkalosis and symptoms such as dizziness, tingling in fingers, and visual disturbances.
10A pilot at 12,000 feet is experiencing symptoms like tingling fingers, lightheadedness, and headache. Since hyperventilation and hypoxia symptoms overlap, how should the pilot immediately respond?
A.Perform a Valsalva maneuver to clear the middle ear and sinuses
B.Breathe rapidly into a paper bag to restore carbon dioxide levels
C.Assume the symptoms are hypoxia and immediately breathe 100 percent supplemental oxygen
D.Slow the breathing rate down to 6 breaths per minute to prevent oxygen toxicity
Explanation: Because the symptoms of hypoxia and hyperventilation overlap significantly and hypoxia is immediately life-threatening at high altitudes, the pilot must always treat the symptoms as hypoxia first by administering 100 percent oxygen and initiating a descent.

About the CPL Human Performance Exam

The CAASL CPL Human Performance and Limitations examination is a key requirement for obtaining a Commercial Pilot Licence in Sri Lanka. Governed by the Civil Aviation Authority of Sri Lanka and aligned with EASA Part-FCL standards, this computer-based test ensures candidates possess a thorough understanding of pilot physiology, sensory systems, cognitive processing, stress, sleep architecture, and safety culture. Understanding these factors is critical for managing flight deck workloads and avoiding human error in commercial operations. The official exam consists of 30 multiple-choice questions with a time limit of 45 minutes, administered at the CAASL examination center in Katunayake. To pass, candidates must achieve a score of 75% or higher. Successful candidates demonstrate a mastery of how altitude affects the body, how visual and vestibular illusions occur, how decision-making changes under stress, and how threat and error management (TEM) is applied to maintain safety margins. Preparing for this exam requires a structured study plan that combines theory with practice. Focus on core physiological concepts like hypoxia, hyperventilation, and decompression sickness, alongside psychological components such as memory limitations, situational awareness, and crew resource management (CRM). Practicing with mock exams and analyzing explanations for distractor answers will significantly enhance recall and cognitive application during the actual test.

Exam sponsor: Civil Aviation Authority of Sri Lanka (CAASL) Examination Center. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

30 questions

Time Limit

45 minutes

Passing Score

75%

Exam / Certification Fees

LKR 2,000

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

35%

Aviation Physiology and Health

Atmospheric properties, respiration, gas laws, hypoxia, hyperventilation, spatial disorientation, vestibular illusions, visual and auditory sensory systems, toxic hazards (CO, fuel, alcohol, medications, and scuba diving restrictions).

30%

Basic Aviation Psychology and Human Information Processing

Visual and auditory perception, memory (sensory, working, and long-term), attention, information processing capacity, mental workload, situational awareness, and decision-making models (e.g., DECIDE).

20%

Stress, Fatigue and Sleep Management

Arousal-performance relationship (Yerkes-Dodson Law), stressors (physical, physiological, psychological), acute and chronic fatigue, sleep stages, circadian rhythms, jet lag, and shift work strategies.

15%

Crew Resource Management (CRM) and Threat and Error Management (TEM)

Communication barriers, leadership and followership, personality types, group decision-making, threat identification, error classification, and mitigation strategies.

Preparing for the CPL Human Performance Exam

What You Need to Know

  • Passing score: 75%
  • Exam length: 30 questions
  • Time limit: 45 minutes
  • Exam / certification fees: LKR 2,000 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CPL Human Performance: Suggested Study Strategy

1Memorize physiological thresholds and timelines, such as the Time of Useful Consciousness (TUC) at various altitudes and blood-alcohol limitations.
2Understand the mechanics of spatial disorientation and vestibular illusions, particularly the 'leans', somatogravic illusion, and Coriolis effect.
3Be familiar with Crew Resource Management (CRM) concepts, leadership styles, and the Threat and Error Management (TEM) framework (threats, errors, undesired state management).
4Use active recall and practice questions to build familiarity with the multiple-choice format under a 45-minute timer.

Frequently Asked Questions

Where is the CAASL theoretical exam held in Sri Lanka?

The CAASL exams are computer-based and administered at the CAASL Examination Center located in Katunayake, Sri Lanka. Booking must be done in advance through the CAASL licensing system.

What is the format and duration of the CPL Human Performance exam?

The official exam contains 30 multiple-choice questions and has a time limit of 45 minutes. The pass mark is 75%, meaning you must answer at least 23 questions correctly.

What are the rules regarding scuba diving and flight operations?

Under standard aviation physiology guidelines, pilots must not fly within 12 to 24 hours after non-decompression diving, and at least 24 hours after decompression diving, to prevent decompression sickness.

What is the fee for the CAASL CPL theory exams?

The CAASL fee for a single subject exam at the CPL level is LKR 2,000. This is paid during exam registration.