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Question (21)

QN002221

A wind exerts a force of 500 N on a wall of area 10 m². Calculate the pressure.

(A) 5 Pa
(B) 50 Pa
(C) 5000 Pa
(D) 0.02 Pa

Correct Answer: B

Explanation:

Pressure = 500 ÷ 10 = 50 Pa

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Question (22)

QN002222

Which example best shows movement of air from high pressure to low pressure?

(A) Water freezing into ice
(B) Air escaping from a punctured tube
(C) Iron nail rusting
(D) Dissolving sugar in water

Correct Answer: B

Explanation:

Escaping air moves from high pressure to low pressure.

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Question (23)

QN002223

Sea breeze is strongest when:

(A) Land is cooler than sea
(B) Pressure difference between sea and land is high
(C) Pressure becomes equal everywhere
(D) Air remains still

Correct Answer: B

Explanation:

Greater pressure difference causes stronger winds.

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Question (24)

QN002224

During land breeze, the low-pressure region develops above the:

(A) Land
(B) Sea
(C) Mountain
(D) Forest

Correct Answer: B

Explanation:

At night the sea remains warmer and develops low pressure.

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Question (25)

QN002225

A pressure difference of 90 Pa acts across an area of 15 m². Find the force produced.

(A) 6 N
(B) 105 N
(C) 1350 N
(D) 1500 Pa

Correct Answer: C

Explanation:

Force = 90 × 15 = 1350 N

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Question (26)

QN002226

Wind speed increases when:

(A) Pressure difference decreases
(B) Pressure difference increases
(C) Temperature becomes zero
(D) Clouds disappear completely

Correct Answer: B

Explanation:

Greater pressure difference increases wind speed.

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Question (27)

QN002227

The air above heated land rises because it becomes:

(A) Denser
(B) Heavier
(C) Lighter
(D) Dry

Correct Answer: C

Explanation:

Warm air is lighter than cool air.

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Question (28)

QN002228

Which pair is correctly matched?

(A) Sea breeze — Night
(B) Land breeze — Day
(C) Sea breeze — Air from sea to land
(D) Land breeze — Air from sea to land

Correct Answer: C

Explanation:

Sea breeze blows from sea to land during daytime.

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Question (29)

QN002229

A moving air current exerts 2400 N force over an area of 12 m². What is the pressure?

(A) 20 Pa
(B) 200 Pa
(C) 240 Pa
(D) 28800 Pa

Correct Answer: B

Explanation:

Pressure = 2400 ÷ 12 = 200 Pa

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Question (30)

QN002230

Which statement is true regarding formation of winds?

(A) Winds form only during storms
(B) Winds form because air pressure differs from place to place
(C) Winds form due to movement of oceans only
(D) Winds blow from low pressure to high pressure

Correct Answer: B

Explanation:

Winds are caused by differences in air pressure.

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Question (21)

A wind exerts a force of 500 N on a wall of area 10 m². Calculate the pressure.

Explanation:

Link:

Question (22)

Which example best shows movement of air from high pressure to low pressure?

Explanation:

Link:

Question (23)

Sea breeze is strongest when:

Explanation:

Link:

Question (24)

During land breeze, the low-pressure region develops above the:

Explanation:

Link:

Question (25)

A pressure difference of 90 Pa acts across an area of 15 m². Find the force produced.

Explanation:

Link:

Question (26)

Wind speed increases when:

Explanation:

Link:

Question (27)

The air above heated land rises because it becomes:

Explanation:

Link:

Question (28)

Which pair is correctly matched?

Explanation:

Link:

Question (29)

A moving air current exerts 2400 N force over an area of 12 m². What is the pressure?

Explanation:

Link:

Question (30)

Which statement is true regarding formation of winds?

Explanation:

Link:

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