DGCA Air Navigation: Solar System & Time Questions
135 exam-style Solar System & Time questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
In which months is the difference between apparent noon and means noon the greatest?
- AMarch and September
- BJune and December
- CNovember and February
- DJanuary 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?
- ABecause the Earth's spin axis is inclined to the plane of its orbit round the Sun
- BBecause the distance between the Earth and the Sun varies over a year
- CBecause the Earth's orbital speed round the Sun varies according to the time of the year
- DBecause 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?
- AIt is local time
- BIt is local time adjusted to whole or half hours difference from UTC
- CIt is based on local sunrise and sunset
- DIt 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?
- A81°30'
- B78°15'
- C79°10'
- D80°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?
- A1815
- B1345
- C1415
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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.
- Q6
The main reason that day and night, throughout the year, have different duration, is due to the?
- ARelative speed of the sun along the ecliptic
- BInclination of the ecliptic to the equator
- CEarth's rotation
- DGravitational 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?
- A0254 UTC
- B2154 UTC
- C0714 UTC
- D0514 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?
- A2143 UTC
- B0243 UTC
- C0743 UTC
- D0523 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?
- A0630 UTC
- B0243 UTC
- C0743 UTC
- D0523 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?
- A27.5°
- B66.5°
- C23.5°
- D25.3°
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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)?
- ABeginning of July
- BEnd of September
- CBeginning of January
- DEnd 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?
- AAutumn Equlnox and Winter Solstice
- BSpring (Vernal) Equinox and Autumn Equinox
- CSummer Solstice and Winter Solstice
- DSpring (Vernal) Equinox and Summer Solstice
Show answer
Correct answer: B. Spring (Vernal) Equinox and Autumn Equinox
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