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Atmospheric Electricity & Lightning (Atmospheric Sciences) Solved Questions & Notes (2026) - Apex Rankers

Meteorology & Atmospheric Sciences > Atmospheric Sciences > Atmospheric Electricity & Lightning

10 Total Solved Questions
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Atmospheric Electricity & Lightning

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Q. 1 Atmospheric Sciences
Difficulty: Medium (1 Mark)
What is the primary mechanism of electric charge separation inside a convective thunderstorm cloud (cumulonimbus)?
A
Collisions between falling graupel (soft hail) and rising ice crystals in the presence of supercooled liquid water droplets, transferring negative charge to graupel and positive charge to ice crystals
✓ Correct
B
Friction between nitrogen and oxygen molecules
C
Cosmic rays ionizing ozone
D
Static electricity from jet aircraft wings
💡 Step-by-Step Explanation & Concept Rationale
Non-inductive charging via rebounding collisions between graupel and ice crystals in the mixed-phase zone (-10 °C to -20 °C) leaves graupel negatively charged (settling into lower cloud) and light ice crystals positively charged (lifted to upper cloud anvil).
Q. 2 Atmospheric Sciences
Difficulty: Hard (1 Mark)
What is the typical charge structure of a mature cumulonimbus thunderstorm?
A
A dipole or tripole structure with a main positive charge center in the upper anvil, a main negative charge center in the mid-levels, and a smaller positive charge pocket near the cloud base
✓ Correct
B
Entirely negative from top to bottom
C
Entirely positive from top to bottom
D
Alternating neutral bands
💡 Step-by-Step Explanation & Concept Rationale
Thunderstorms generally exhibit a tripole charge distribution: upper positive anvil, middle negative core (around -15 °C level), and a localized lower positive charge center.
Q. 3 Atmospheric Sciences
Difficulty: Medium (1 Mark)
What initiates a cloud-to-ground (CG) lightning flash?
A
A faint, luminous, stepped leader descending in discrete steps (~50 m length every ~50 microseconds) from the negative cloud charge center toward the ground
✓ Correct
B
A return stroke shooting down from the sun
C
An earthquake fault slip
D
A sound wave
💡 Step-by-Step Explanation & Concept Rationale
The stepped leader originates in the cloud and propagates downward in intermittent luminous steps. As it nears the ground, an upward connecting streamer rises to meet it.
Q. 4 Atmospheric Sciences
Difficulty: Medium (1 Mark)
What is the 'Return Stroke' in a lightning flash?
A
The intensely luminous, massive surge of electric current (tens of thousands of amperes) rushing upward from the ground to the cloud along the ionized channel once connection is made
✓ Correct
B
The return of rain to a cloud
C
A second thunderstorm forming the next day
D
The echo of thunder from a hill
💡 Step-by-Step Explanation & Concept Rationale
The return stroke is the bright flash we see: an enormous current pulse (typically 30,000 amperes) propagating upward at roughly one-third the speed of light, heating the channel to ~30,000 K.
Q. 5 Atmospheric Sciences
Difficulty: Easy (1 Mark)
What is the physical cause of 'Thunder'?
A
The explosive acoustic shock wave produced by the instantaneous thermal expansion of air heated to nearly 30,000 K (hotter than the Sun's surface) along the narrow lightning channel
✓ Correct
B
Clouds colliding together like solid rocks
C
Raindrops hitting the ground at supersonic speed
D
Electricity sparking in the ground
💡 Step-by-Step Explanation & Concept Rationale
The return stroke heats the air column in microseconds to ~30,000 K. The resulting extreme overpressure produces a supersonic cylindrical shock wave that decays into the acoustic rumble of thunder.
Q. 6 Atmospheric Sciences
Difficulty: Easy (1 Mark)
Using the speed of sound in air (~340 m/s or approx 1 km per 3 seconds), how far away is a lightning strike if you hear thunder exactly 6 seconds after seeing the flash?
A
Approximately 2 kilometers (~1.2 miles)
✓ Correct
B
6 kilometers
C
600 meters
D
20 kilometers
💡 Step-by-Step Explanation & Concept Rationale
Because light travels virtually instantaneously (~300,000 km/s), distance = speed of sound x time = 340 m/s x 6 s = 2,040 meters (~2 km).
Q. 7 Atmospheric Sciences
Difficulty: Hard (1 Mark)
What are 'Sprites' in upper-atmospheric electricity?
A
Large-scale luminous reddish electrical discharges that occur high above active thunderstorms in the mesosphere (50 to 90 km altitude), triggered by intense positive cloud-to-ground flashes
✓ Correct
B
Tiny cloud droplets in fog
C
Electrical sparks on telephone wires
D
Static shocks from door knobs
💡 Step-by-Step Explanation & Concept Rationale
Sprites are Transient Luminous Events (TLEs): brief, jellyfish-like crimson flashes in the mesosphere caused by quasi-electrostatic fields above powerful thunderstorms.
Q. 8 Atmospheric Sciences
Difficulty: Hard (1 Mark)
What are 'Blue Jets'?
A
Narrow, conical, blue beams of optical emission that propagate upward from the top of severe thunderstorm clouds toward the stratosphere at speeds of ~100 km/s
✓ Correct
B
Military fighter jets flying in formation
C
Methane flares in peat bogs
D
Deep ocean bioluminescence
💡 Step-by-Step Explanation & Concept Rationale
Blue jets are upward-propagating electrical discharges originating near the cloud top and propagating into the stratosphere, emitting blue light from ionized molecular nitrogen.
Q. 9 Atmospheric Sciences
Difficulty: Hard (1 Mark)
What is the 'Global Electrical Circuit' (GEC)?
A
A continuous global planetary circuit where thousands of active thunderstorms worldwide act as batteries, driving upward electric currents that charge the highly conducting ionosphere to ~250 kV relative to the Earth's surface
✓ Correct
B
The international undersea internet cable network
C
The electrical power grid of Europe
D
Earth's molten iron dynamo in the core
💡 Step-by-Step Explanation & Concept Rationale
In the Global Electrical Circuit (C.T.R. Wilson), thunderstorms pump positive charge up to the ionosphere; the circuit is closed by a fair-weather downward return conduction current worldwide.
Q. 10 Atmospheric Sciences
Difficulty: Hard (1 Mark)
What is the typical fair-weather electric field strength (potential gradient) near the Earth's surface under clear skies?
A
Approximately 100 to 150 Volts per meter (directed downward toward the negatively charged Earth surface)
✓ Correct
B
0 Volts per meter
C
10,000 Volts per meter
D
1 Volt per kilometer
💡 Step-by-Step Explanation & Concept Rationale
Under fair-weather conditions, Earth's surface carries a negative charge, and the atmospheric electric field is typically 100 to 150 V/m directed downward.
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