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Question (21)

QN002291

Lightning conductors work because metals are:

(A) Insulators
(B) Poor conductors
(C) Good conductors of electricity
(D) Magnetic only

Correct Answer: C

Explanation:

Metals conduct electricity well.

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Question (22)

QN002292

Which weather condition usually occurs before a thunderstorm?

(A) Rising warm moist air
(B) Snow accumulation
(C) Thick fog only
(D) Extremely cold winds only

Correct Answer: A

Explanation:

Rising warm moist air forms thunderstorms.

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Question (23)

QN002293

Which of the following should be avoided during lightning?

(A) Staying indoors
(B) Sitting in a car
(C) Using electrical appliances
(D) Closing windows

Correct Answer: C

Explanation:

Electrical appliances should be avoided.

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Question (24)

QN002294

A lightning flash is seen instantly, while thunder is heard after 4 s. Using sound speed 340 m/s, determine the storm distance.

(A) 340 m
(B) 680 m
(C) 1020 m
(D) 1360 m

Correct Answer: D

Explanation:

Distance = 340 × 4 = 1360 m

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Question (25)

QN002295

Which statement about lightning is correct?

(A) It is a flow of electric charges
(B) It is produced by rainfall only
(C) It occurs only at night
(D) It is caused by sound waves

Correct Answer: A

Explanation:

Lightning is an electrical discharge.

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Question (26)

QN002296

Thunderstorms are more common in regions having:

(A) Warm humid climate
(B) Dry cold climate
(C) Snow-covered land only
(D) Desert climate only

Correct Answer: A

Explanation:

Warm humid regions favour thunderstorms.

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Question (27)

QN002297

During thunderstorms, electrical appliances should be unplugged because:

(A) Lightning may damage them
(B) Appliances stop rainfall
(C) Wires absorb clouds
(D) Electricity disappears completely

Correct Answer: A

Explanation:

Lightning can damage electrical devices.

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Question (28)

QN002298

A lightning discharge releases 7200 J in 6 s. Calculate the power.

(A) 600 W
(B) 900 W
(C) 1200 W
(D) 1800 W

Correct Answer: C

Explanation:

Power = 7200 ÷ 6 = 1200 W

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Question (29)

QN002299

Which of the following is safest during a thunderstorm in an open area?

(A) Lying flat on ground
(B) Standing near electric pole
(C) Crouching low with feet together
(D) Holding umbrella upward

Correct Answer: C

Explanation:

Crouching low reduces lightning risk.

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Question (30)

QN002300

The loudness of thunder depends mainly on:

(A) Colour of clouds
(B) Energy released during lightning
(C) Shape of buildings
(D) Humidity only

Correct Answer: B

Explanation:

More energy produces louder thunder.

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Question (21)

Lightning conductors work because metals are:

Explanation:

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Question (22)

Which weather condition usually occurs before a thunderstorm?

Explanation:

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Question (23)

Which of the following should be avoided during lightning?

Explanation:

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Question (24)

A lightning flash is seen instantly, while thunder is heard after 4 s. Using sound speed 340 m/s, determine the storm distance.

Explanation:

Link:

Question (25)

Which statement about lightning is correct?

Explanation:

Link:

Question (26)

Thunderstorms are more common in regions having:

Explanation:

Link:

Question (27)

During thunderstorms, electrical appliances should be unplugged because:

Explanation:

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Question (28)

A lightning discharge releases 7200 J in 6 s. Calculate the power.

Explanation:

Link:

Question (29)

Which of the following is safest during a thunderstorm in an open area?

Explanation:

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Question (30)

The loudness of thunder depends mainly on:

Explanation:

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