DGCA Meteorology: Jet Streams & Upper Winds Questions
55 exam-style Jet Streams & Upper Winds questions for the DGCA Meteorology 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
An aircraft flying in Summer season from Delhi to Kolkata at 10 km will experience
- A Westerly
- B Northerly
- C Southerly
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Correct answer: A. Westerly
In the Indian summer, the upper-tropospheric flow over northern India at about 10 km remains westerly under the subtropical westerly regime, so a Delhi to Kolkata flight at that level experiences westerly winds.
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Q2
Flying at right angles to a jet stream with falling pressure you will experience
- A Wind from left
- B Increasing head wind
- C Increasing tail wind
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Correct answer: A. Wind from left
Falling pressure means you are flying toward lower pressure, and in the northern hemisphere Buys Ballot's law places the low on the left of an observer with back to the wind, so an aircraft heading toward a low has the wind from its left.
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Q3
How do you recognise high level jet streams and associated CAT?
- A High pressure centre at high level
- B Streaks of Cirrus
- C High level dust
- D Lenticularis
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Correct answer: B. Streaks of Cirrus
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Q4
What type of jet stream blows constantly through the northern hemisphere?
- A Arctic
- B Equatorial
- C Polar night
- D Sub tropical
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Correct answer: D. Sub tropical
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Q5
In central Europe, where are the greatest wind speeds?
- A Tropopause level
- B 5500m
- C Where the air converges
- D Above the Alps
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Correct answer: A. Tropopause level
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Q6
The Arctic Jet core is at:
- A 20,000ft
- B 30,000ft
- C 40,000ft
- D 50,000ft
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Correct answer: A. 20,000ft
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Q7
FL180, Northern Hemisphere with a wind from the left, what can you say about temperature with a heading of 360°?
- A Not possible to tell without a pressure
- B Increases from South to North
- C Increases from North to South
- D Nothing
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Correct answer: C. Increases from North to South
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Q8
When heading South in the Southern Hemisphere you experience Starboard drift:
- A You are flying towards a lower temperature
- B You are flying away from a lower temperature
- C You are flying towards a low pressure
- D You are flying out of a high
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Correct answer: B. You are flying away from a lower temperature
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Q9
With a polar front jet stream (PFJ), the area with the highest probability of turbulence in the Southern Hemisphere is:
- A In the jet core
- B Above the jet core in the boundary of the warm and cold air
- C Looking downstream, on your left hand side
- D Looking downstream, on your right hand side
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Correct answer: D. Looking downstream, on your right hand side
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Q10
Contours on a weather chart indicate:
- A Heights of pressure levels
- B Distance between pressure levels
- C Thickness between pressure levels
- D Height of ground
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Correct answer: A. Heights of pressure levels
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Q11
If an Isohypse on a surface pressure chart of 500hPa shows a figure of 522, this indicates
- A Topography of 522m above MSL
- B Topography of 522 decametres above MSL
- C Pressure is 522mb
- D A low surface pressure
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Correct answer: B. Topography of 522 decametres above MSL
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Q12
The polar front jet stream in summer compared to winter in the Northern Hemisphere moves
- A North and decreases in strength
- B North and increases in strength
- C South and decreases in strength
- D South and increases in strength
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Correct answer: A. North and decreases in strength
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