DGCA Air Navigation: Solar System & Time Questions
135 exam-style Solar System & Time questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
In which months is the difference between apparent noon and means noon the greatest?
- A March and September
- B June and December
- C November and February
- D January and July
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Correct answer: C. November and February
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Q2
What is the reason for seasonal changes in climate?
- A Because the Earth's spin axis is inclined to the plane of its orbit round the Sun
- B Because the distance between the Earth and the Sun varies over a year
- C Because the Earth's orbital speed round the Sun varies according to the time of the year
- D Because of the difference between the Tropical Year and the Calendar year
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Correct answer: A. Because the Earth's spin axis is inclined to the plane of its orbit round the Sun
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Q3
How would you define standard time in relation to UTC?
- A It is local time
- B It is local time adjusted to whole or half hours difference from UTC
- C It is based on local sunrise and sunset
- D It is another term for UTC
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Correct answer: B. It is local time adjusted to whole or half hours difference from UTC
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Q4
A time difference of 5 hours 20 minutes and 20 seconds is equivalent to which change of longitude?
- A 81°30'
- B 78°15'
- C 79°10'
- D 80°5'
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Correct answer: D. 80°5'
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Q5
What is the local mean time, position 65°25’N 123°45’W at 2200 UTC?
- A 1815
- B 1345
- C 1415
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Correct answer: B. 1345
Longitude 123°45'W converts to 8h15m of arc-to-time, and being west of Greenwich it is subtracted from UTC. From 2200 UTC this gives a local mean time of 1345.
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Q6
The main reason that day and night, throughout the year, have different duration, is due to the?
- A Relative speed of the sun along the ecliptic
- B Inclination of the ecliptic to the equator
- C Earth's rotation
- D Gravitational effect of the sun and moon on the speed of rotation of the Earth
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Correct answer: B. Inclination of the ecliptic to the equator
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Q7
The sun rises at 50°N nd 025°E on the 25th January at 0254 UTC. On the same day what time does it rise at 50°N and 040°W?
- A 0254 UTC
- B 2154 UTC
- C 0714 UTC
- D 0514 UTC
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Correct answer: C. 0714 UTC
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Q8
On the 27th of February, at 52°S and 040°E, the sunrise is at 0243UTC. On the same day, at 52°S and 035°W, the sunrise is at?
- A 2143 UTC
- B 0243 UTC
- C 0743 UTC
- D 0523 UTC
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Correct answer: C. 0743 UTC
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Q9
On the 27th of February, at 55°S and 020°W. The sunrise is at 0250 UTC. On the same day, at 55°S and 075°W, the sunrise is at?
- A 0630 UTC
- B 0243 UTC
- C 0743 UTC
- D 0523 UTC
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Correct answer: A. 0630 UTC
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Q10
The angle between the plane of the ecliptic and the plane of equator is approximately?
- A 27.5°
- B 66.5°
- C 23.5°
- D 25.3°
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Correct answer: C. 23.5°
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Q11
At what approximate date is the earth furthest from the sun (aphelion)?
- A Beginning of July
- B End of September
- C Beginning of January
- D End of December
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Correct answer: A. Beginning of July
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Q12
At what times of the year does the length of the hours of daylight change most rapidly?
- A Autumn Equlnox and Winter Solstice
- B Spring (Vernal) Equinox and Autumn Equinox
- C Summer Solstice and Winter Solstice
- D Spring (Vernal) Equinox and Summer Solstice
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Correct answer: B. Spring (Vernal) Equinox and Autumn Equinox
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