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Question (21)

QN002191

The flow of air between two connected balloons stops when:

(A) Both balloons burst
(B) Pressure in both balloons becomes equal
(C) One balloon becomes larger
(D) The straw bends

Correct Answer: B

Explanation:

Air flow stops when pressures become equal.

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Question (22)

QN002192

A pressure of 75 Pa acts on an area of 12 m². Find the force exerted.

(A) 6.25 N
(B) 87 Pa
(C) 900 N
(D) 750 N

Correct Answer: C

Explanation:

Force = 75 × 12 = 900 N

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Question (23)

QN002193

Winds are formed mainly because of:

(A) Equal air pressure everywhere
(B) Differences in air pressure
(C) Rotation of Earth only
(D) Friction between clouds

Correct Answer: B

Explanation:

Pressure differences cause winds.

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Question (24)

QN002194

Air always flows from:

(A) Cold region to hot region only
(B) Low pressure region to high pressure region
(C) High pressure region to low pressure region
(D) Moist region to dry region only

Correct Answer: C

Explanation:

Air naturally flows from high to low pressure.

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Question (25)

QN002195

During daytime, sea breeze occurs because:

(A) Air pressure over sea becomes lower than land
(B) Air pressure over land becomes lower than sea
(C) Sea gets heated faster than land
(D) Land remains cooler than sea

Correct Answer: B

Explanation:

Heated land develops low pressure.

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Question (26)

QN002196

At night, land breeze occurs because:

(A) Sea becomes cooler than land
(B) Land becomes warmer than sea
(C) Low pressure develops above the sea
(D) Pressure becomes equal everywhere

Correct Answer: C

Explanation:

Warmer sea develops low pressure at night.

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Question (27)

QN002197

If the pressure difference between two regions increases, the speed of moving air will:

(A) Decrease
(B) Become zero
(C) Increase
(D) Remain unchanged

Correct Answer: C

Explanation:

Greater pressure difference increases wind speed.

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Question (28)

QN002198

High-speed winds are accompanied by:

(A) High air pressure
(B) Low air pressure
(C) No pressure difference
(D) Equal pressure on all sides

Correct Answer: B

Explanation:

High-speed winds lower air pressure.

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Question (29)

QN002199

When fast-moving wind blows over a roof, the roof may rise because:

(A) Pressure above roof increases
(B) Pressure below roof becomes less
(C) Pressure above roof becomes lower than inside
(D) Gravity decreases suddenly

Correct Answer: C

Explanation:

Lower pressure above creates upward force.

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Question (30)

QN002200

Why is it safer to keep doors and windows open during strong storms?

(A) To allow sunlight inside
(B) To reduce pressure difference between inside and outside
(C) To increase wind speed indoors
(D) To decrease atmospheric pressure completely

Correct Answer: B

Explanation:

Openings help balance air pressure.

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Question (21)

The flow of air between two connected balloons stops when:

Explanation:

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Question (22)

A pressure of 75 Pa acts on an area of 12 m². Find the force exerted.

Explanation:

Link:

Question (23)

Winds are formed mainly because of:

Explanation:

Link:

Question (24)

Air always flows from:

Explanation:

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Question (25)

During daytime, sea breeze occurs because:

Explanation:

Link:

Question (26)

At night, land breeze occurs because:

Explanation:

Link:

Question (27)

If the pressure difference between two regions increases, the speed of moving air will:

Explanation:

Link:

Question (28)

High-speed winds are accompanied by:

Explanation:

Link:

Question (29)

When fast-moving wind blows over a roof, the roof may rise because:

Explanation:

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Question (30)

Why is it safer to keep doors and windows open during strong storms?

Explanation:

Link:

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