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100+ Free PPL Navigation & Communication Theory Practice Questions

Pass your Sri Lanka CAA PPL(A) Navigation & Communication Theory Examination exam on the first try — instant access, no signup required.

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Sample PPL Navigation & Communication Theory Practice Questions

Try these sample questions to test your PPL Navigation & Communication Theory exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the approximate shape of the Earth used for practical navigation purposes?
A.A perfect sphere
B.An oblate spheroid (flattened at the poles)
C.A prolate spheroid (elongated at the poles)
D.A flat disc with raised continents
Explanation: The Earth is modelled as an oblate spheroid: the equatorial diameter is greater than the polar diameter because rotation causes equatorial bulge. For PPL navigation this approximation is sufficient.
2One degree of latitude is approximately equal to which distance on the Earth's surface?
A.1 nautical mile
B.60 nautical miles
C.100 statute miles
D.15 kilometres
Explanation: By definition, one minute of arc of latitude equals one nautical mile, so one degree of latitude equals 60 nautical miles (approximately, allowing for the spheroid).
3Latitude is measured from which reference?
A.The Greenwich meridian
B.The Equator
C.The North Magnetic Pole
D.The International Date Line
Explanation: Latitude is the angular distance north or south of the Equator, from 0° at the Equator to 90° at the poles.
4Longitude is measured east or west from which meridian?
A.The Equator
B.The Greenwich (Prime) meridian
C.The magnetic equator
D.The Tropic of Cancer
Explanation: Longitude is angular distance east or west of the Greenwich (Prime) meridian, from 0° to 180° E or W.
5A great circle is best described as:
A.Any circle on the Earth parallel to the Equator
B.The intersection of the Earth's surface with a plane passing through the Earth's centre
C.A constant-heading track on a Mercator chart
D.A line of equal magnetic variation
Explanation: A great circle is formed by a plane through the Earth's centre cutting the surface. The shortest distance between two points on a sphere lies along a great-circle arc.
6A rhumb line is a line that:
A.Cuts all meridians at the same angle (constant true direction)
B.Always represents the shortest distance between two points
C.Is always a parallel of latitude
D.Passes through both geographic poles
Explanation: A rhumb line (loxodrome) maintains a constant true course, crossing successive meridians at the same angle. On a Mercator chart it appears as a straight line.
7Which statement about meridians is correct?
A.Meridians are parallels of latitude
B.Meridians are semi-great circles joining the geographic poles
C.Meridians converge at the Equator
D.All meridians are small circles
Explanation: Meridians run from pole to pole along great-circle arcs (commonly described as semi-great circles from North to South Pole) and are the reference for measuring longitude.
8The Equator is unique among parallels of latitude because it is:
A.A small circle
B.A great circle
C.A rhumb line of constant magnetic heading only
D.The International Date Line
Explanation: The Equator is the only parallel that is a great circle because its plane passes through the Earth's centre. All other parallels are small circles.
9On a Mercator projection chart, a rhumb line appears as:
A.A curved line concave to the nearer pole
B.A straight line
C.A spiral that never reaches the pole
D.A series of short great-circle chords
Explanation: Mercator charts are constructed so that meridians are parallel vertical lines and a constant true direction (rhumb line) plots as a straight line — convenient for course plotting.
10Lambert conformal conic charts are preferred for many mid-latitude aviation maps because:
A.Scale is constant everywhere on the chart
B.Great circles approximate straight lines and angles are preserved (conformal)
C.Meridians are parallel and rhumb lines are always curved
D.Magnetic variation is printed as zero across the sheet
Explanation: Lambert conformal conic projections preserve angles (conformal) and make great-circle tracks nearly straight between the standard parallels — useful for en-route navigation charts.

About the PPL Navigation & Communication Theory Exam

The Civil Aviation Authority of Sri Lanka (CAASL) Private Pilot Licence (Aeroplane) Navigation & Communication Theory examination is Subject 6 of the PPL theoretical knowledge suite (CAASL sn076 / Examination Center). The official paper has 45 multiple-choice questions — 30 Navigation and 15 Communication Theory — with a duration of 1 hour and 30 minutes and a pass mark of 75%. No negative marking applies. Navigation topics include the form of the Earth, latitude and longitude, great-circle and rhumb-line tracks, Mercator and Lambert conformal charts, scale, magnetic variation and compass deviation, dead reckoning (TAS, groundspeed, wind triangle, heading/track, ETA, and fuel), flight-computer (CRP-5/E6B style) calculations, time/speed/distance, magnetism and basic compass errors, and elementary radio navigation (VOR, NDB/ADF, DME, GNSS/GPS) for VFR private pilots. Communication Theory covers VHF principles, standard phraseology concepts, and distress/urgency signal theory — not the separate practical radiotelephony classroom test required for licence issue. Exams are administered at the CAASL Examination Center. Candidates should verify current fees in SLCAP 7100 and book through their approved FTO. This practice bank provides 100 curated questions weighted toward navigation with a minority of communication-theory items aligned to the same official paper.

Questions

45 scored questions

Time Limit

1 hour and 30 minutes

Passing Score

75%

Exam Fee

See SLCAP 7100 (CAASL fees schedule) (Civil Aviation Authority of Sri Lanka (CAASL) Examination Center)

PPL Navigation & Communication Theory Exam Content Outline

40%

Charts and Dead Reckoning

Projections, variation/deviation, and wind triangle.

30%

Radio Navigation Basics

VOR, NDB, DME, and GNSS for VFR.

30%

Communication Theory

VHF phraseology theory, distress/urgency (not practical RT test).

How to Pass the PPL Navigation & Communication Theory Exam

What You Need to Know

  • Passing score: 75%
  • Exam length: 45 questions
  • Time limit: 1 hour and 30 minutes
  • Exam fee: See SLCAP 7100 (CAASL fees schedule)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Frequently Asked Questions

What is the pass mark for the CAASL PPL Navigation exam?

The CAASL theoretical knowledge pass mark is 75%, with no negative marking for incorrect answers.

How many questions are on the official CAASL PPL Navigation paper?

The official paper is published as 45 questions with a duration of 1 hour and 30 minutes (see SLCAP 3080 / IS-66 / CAASL Examination Center).

Who administers the CAASL PPL Navigation examination?

The Civil Aviation Authority of Sri Lanka (CAASL) conducts knowledge examinations at the CAASL Examination Center.

Where can I confirm fees?

Examination fees are published in CAASL SLCAP 7100 (Fees and Charges). Confirm the current per-subject fee before booking.