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CivilWater Resources Management
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Which is the form of liquid precipitation?

A

snow

B

rain

C

sleet

D

all of the above

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilWater Resources Management
Option B

rain

Quick Summary:

Rain is the primary form of liquid precipitation where water droplets in the atmosphere coalesce and fall to the ground when their size exceeds the support capacity of updrafts. In hydrology, it is defined as water falling in liquid form with a droplet size typically greater than 0.5 mm.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

Rain is the primary form of liquid precipitation where water droplets in the atmosphere coalesce and fall to the ground when their size exceeds the support capacity of updrafts. In hydrology, it is defined as water falling in liquid form with a droplet size typically greater than 0.5 mm.

ЁЯФв Key Formulas

Vt=2r2g(╧БwтИТ╧Бa)9╬╖V_t = \frac{2r^2g(\rho_w - \rho_a)}{9\eta}VtтАЛ=9╬╖2r2g(╧БwтАЛтИТ╧БaтАЛ)тАЛ тАФ Terminal velocity of a raindrop where VtV_tVtтАЛ is velocity, rrr is radius, ggg is gravity, and ╬╖\eta╬╖ is viscosity.

тЪЩя╕П Working Principle

The process involves the Bergeron-Findeisen mechanism or collision-coalescence process. In clouds, water vapor condenses into droplets around cloud condensation nuclei (CCN). When these droplets collide and merge, they grow large enough to overcome atmospheric resistance and fall as rain.

ЁЯУМ Key Points
  • тЦ╕

    Rain is liquid water with diameter > 0.5 mm.

  • тЦ╕

    Drizzle is liquid water with diameter < 0.5 mm.

  • тЦ╕

    Snow is ice crystals formed by deposition.

  • тЦ╕

    Sleet is frozen raindrops (ice pellets).

тЬЕ Advantages
  • тЦ╕

    Recharges groundwater aquifers.

  • тЦ╕

    Supports agriculture and ecological balance.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Excessive rain leads to soil erosion.

  • тЦ╕

    Can cause flash flooding in urban areas.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Hydrological modeling for dam design.

  • тЦ╕

    Meteorological forecasting for agricultural planning.

ЁЯУД Additional Information
  • тЦ╕

    Precipitation is categorized by physical state: liquid (rain, drizzle), freezing (freezing rain), and frozen (snow, sleet, hail).

  • тЦ╕

    Option A (Snow) is a solid form of precipitation. Option C (Sleet) is a mixed/frozen form.

ЁЯУК Diagram / Illustration
Precipitation ClassificationLiquid Form (Rain)Droplet Diameter > 0.5 mmCoalescenceGravity Force
тЬЕ

B is correct тАФ Rain is the only form of precipitation among the choices that occurs entirely in a liquid state.

Core Concepts Used
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Hydrologic Cycle Condensation Nuclei Terminal Velocity
ЁЯТб EXAM TIP

Always distinguish between 'liquid' precipitation (rain) and 'frozen/solid' precipitation (snow/sleet) as this is a fundamental classification in Hydrology.

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