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Question (11)

QN002281

A lightning conductor usually consists of a metal rod connected to:

(A) Plastic pipe
(B) Glass sheet
(C) Earth through metal wire
(D) Wooden support only

Correct Answer: C

Explanation:

The metal rod is connected to Earth.

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Question (12)

QN002282

If thunder is heard 3 s after lightning, calculate the approximate distance of the storm using speed of sound = 330 m/s.

(A) 110 m
(B) 330 m
(C) 660 m
(D) 990 m

Correct Answer: D

Explanation:

Distance = 330 × 3 = 990 m

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Question (13)

QN002283

Which place is safest during lightning?

(A) Under a tall tree
(B) In an open field
(C) Inside a closed building
(D) On a rooftop

Correct Answer: C

Explanation:

Closed buildings are safer during lightning.

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Question (14)

QN002284

During lightning, standing under a tall isolated tree is dangerous because:

(A) Trees absorb oxygen
(B) Tall objects are more likely to be struck
(C) Leaves conduct sound
(D) Trees stop rainfall

Correct Answer: B

Explanation:

Tall isolated objects attract lightning.

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Question (15)

QN002285

A lightning strike delivers 2400 J of energy in 2 s. Calculate the power.

(A) 120 W
(B) 600 W
(C) 1200 W
(D) 4800 W

Correct Answer: C

Explanation:

Power = 2400 ÷ 2 = 1200 W

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Question (16)

QN002286

Thunder is heard after lightning because:

(A) Sound travels slower than light
(B) Light travels slower than sound
(C) Clouds block sound waves
(D) Lightning occurs after thunder

Correct Answer: A

Explanation:

Light travels faster than sound.

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Question (17)

QN002287

Which gas in air becomes highly heated during lightning?

(A) Hydrogen only
(B) Surrounding air
(C) Helium only
(D) Carbon only

Correct Answer: B

Explanation:

Surrounding air becomes highly heated.

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Question (18)

QN002288

Which safety measure is correct during thunderstorms?

(A) Using wired phones outdoors
(B) Taking shelter under trees
(C) Avoiding open fields
(D) Holding metal rods

Correct Answer: C

Explanation:

Open fields should be avoided.

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Question (19)

QN002289

A thunderstorm is accompanied by strong winds due to:

(A) Air pressure differences
(B) Freezing of clouds
(C) Earth’s magnetic field only
(D) Moonlight

Correct Answer: A

Explanation:

Pressure differences create strong winds.

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Question (20)

QN002290

If sound from thunder takes 8 s to reach a person, and sound travels at 335 m/s, find the distance of lightning.

(A) 1340 m
(B) 2010 m
(C) 2680 m
(D) 3350 m

Correct Answer: C

Explanation:

Distance = 335 × 8 = 2680 m

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Question (11)

A lightning conductor usually consists of a metal rod connected to:

Explanation:

Link:

Question (12)

If thunder is heard 3 s after lightning, calculate the approximate distance of the storm using speed of sound = 330 m/s.

Explanation:

Link:

Question (13)

Which place is safest during lightning?

Explanation:

Link:

Question (14)

During lightning, standing under a tall isolated tree is dangerous because:

Explanation:

Link:

Question (15)

A lightning strike delivers 2400 J of energy in 2 s. Calculate the power.

Explanation:

Link:

Question (16)

Thunder is heard after lightning because:

Explanation:

Link:

Question (17)

Which gas in air becomes highly heated during lightning?

Explanation:

Link:

Question (18)

Which safety measure is correct during thunderstorms?

Explanation:

Link:

Question (19)

A thunderstorm is accompanied by strong winds due to:

Explanation:

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Question (20)

If sound from thunder takes 8 s to reach a person, and sound travels at 335 m/s, find the distance of lightning.

Explanation:

Link:

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