PrecipitationAviation Meteorology — DGCA CPL practice questions
Question 1 of 25
When super cooled water drops and ice particles co-exist, the ice crystals grow at the expense of the water drops because
All 25 questions — Precipitation
Aviation Meteorology · DGCA CPL. The correct option is marked on each.
Q1. When super cooled water drops and ice particles co-exist, the ice crystals grow at the expense of the water drops because
- A.Saturation vapour pressure over ice crystals is less than over water drops✓
- B.Saturation vapour pressure over the ice crystals is less than over the water drops
- C.The ice crystals convert into water drops
Why: Bergeron process: saturation vapour pressure is lower over ice than over supercooled water.
Q2. The clouds whose tops extend to the freezing level are called
- A.Warm Clouds
- B.Cold Clouds✓
- C.Moderate Clouds
Why: Clouds reaching/exceeding the 0 C level are classed as cold clouds.
Q3. The clouds whose tops do not extend to the freezing level are called
- A.Warm Clouds✓
- B.Cold Clouds
- C.Moderate Clouds
Why: Clouds entirely below the 0 C level are warm clouds.
Q4. Coalescence Theory explains occurrence of rainfall from
- A.Warm Clouds✓
- B.Cold Clouds
- C.Both types of Clouds
Why: Collision-coalescence produces rain in warm clouds.
Q5. Ice crystal Theory explains occurrence of rainfall from
- A.Warm Clouds
- B.Cold Clouds✓
- C.Both types of Clouds
Why: Ice-crystal mechanism operates in cold clouds containing ice.
Q6. Giant Nucleus Theory explains occurrence of rainfall over
- A.Maritime areas✓
- B.Inland areas
- C.Hilly areas
Why: Large sea-salt nuclei are abundant over maritime areas.
Q7. Very heavy precipitation as showers over an area above the mountain range is called
- A.Maritime areas
- B.Inland areas
- C.Orographic Rain✓
Why: Rain from air forced up a mountain barrier is orographic rain.
Q8. Rain shadow area is on the ......... of the mountain range
- A.Top
- B.Windward side
- C.Leeward side✓
Why: The dry rain-shadow lies on the leeward side of the range.
Q9. Sleet is a mixture of
- A.Hail & Snow
- B.Rain & Snow✓
- C.Frozen Rain
Why: Sleet is precipitation that is a mixture of rain and snow.
Q10. Rainfall in the tropics is more in
- A.Winters
- B.Summers✓
- C.Post monsoon
Why: Tropical convective rainfall peaks in the summer season.
Q11. Rainfall in the tropics is more in the
- A.Morning
- B.Afternoon✓
- C.Night
Why: Daytime heating drives afternoon convective rainfall in the tropics.
Q12. Rainfall in the temperate latitudes is more in
- A.Winters✓
- B.Summers
- C.Spring
Why: Temperate rainfall peaks in winter due to frontal/cyclonic activity.
Q13. Over J&K and western Himalayas Rainfall is more in
- A.Winters✓
- B.Summers
- C.Post monsoon
Why: Western Disturbances bring winter precipitation to J&K and the western Himalayas.
Q14. Rainfall over coastal areas is more in
- A.Evening
- B.Night & early morning✓
- C.Afternoon
Why: Land-breeze convergence favours night/early-morning rain over coasts.
Q15. Areas to the ......... of Western Ghats of India are rain shadow areas
- A.W
- B.S
- C.E✓
Why: The leeward side of the Western Ghats is the rain-shadow region.
Q16. A sudden rise in the level of rivers or streams causing floods is called
- A.Cloud Burst
- B.Catchments flooding
- C.Flash Floods✓
Why: A sudden rapid rise of water level is termed a flash flood.
Q17. Artificial rain making is also termed as
- A.Simulation
- B.Cloud seeding✓
- C.Nucleation
Why: Artificial rainmaking is called cloud seeding, not nucleation.
Q18. Fog can also be dispersed for a short period by artificial stimulation
- A.True✓
- B.False
Why: Fog can be temporarily dispersed by artificial methods.
Q19. Showery precipitation occurs from
- A.NS
- B.AC
- C.CB✓
Why: Showers fall from convective cumulonimbus clouds.
Q20. A day is called Rainy day when rainfall in 24 hr is ......... mm or more
- A.1.5
- B.2
- C.2.5✓
Why: A rainy day is defined as 2.5 mm or more of rain in 24 hours.
Q21. The clouds whose tops extend well above the freezing level are called
- A.Warm Clouds
- B.Cold Clouds✓
- C.Moderate Clouds
Why: Clouds extending well above the 0 C level are cold clouds.
Q22. Coalescence Theory explains occurrence of rainfall from the
- A.Warm Clouds✓
- B.Cold Clouds
- C.Both types of Clouds
Why: Coalescence produces rain in warm clouds; repaired split word 'th e'.
Q23. Ice crystal Theory explains occurrence of rainfall from the
- A.Warm Clouds
- B.Cold Clouds✓
- C.Both types of Clouds
Why: Ice-crystal mechanism produces rain in cold clouds; repaired split word 'th e'.
Q24. Very heavy precipitation as showers over a short period is called
- A.Flash floods
- B.Cloud Burst✓
- C.Orographic Rain
Why: Very heavy shower over a short time/small area is a cloud burst.
Q25. Rainfall over coastal areas is more in the
- A.Evening
- B.Afternoon
- C.Night & early morning✓
Why: Coastal rain is favoured at night and early morning by land-breeze convergence.