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Question (21)

QN002251

A force of 840 N acts due to moving air over an area of 14 m². Find the pressure.

(A) 40 Pa
(B) 50 Pa
(C) 60 Pa
(D) 70 Pa

Correct Answer: C

Explanation:

Pressure = 840 ÷ 14 = 60 Pa

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Question (22)

QN002252

Lower air pressure is associated with:

(A) Slow-moving air
(B) High-speed winds
(C) Still atmosphere
(D) Absence of air

Correct Answer: B

Explanation:

Fast winds create low pressure.

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Question (23)

QN002253

Why do roofs experience an upward force during storms?

(A) Indoor pressure becomes greater than outdoor pressure
(B) Outdoor pressure becomes greater than indoor pressure
(C) Water vapour becomes solid
(D) Air stops moving inside the house

Correct Answer: A

Explanation:

Higher indoor pressure pushes upward.

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Question (24)

QN002254

A wind creates pressure of 90 Pa on an area of 20 m². Calculate the force.

(A) 180 N
(B) 900 N
(C) 1800 N
(D) 2000 N

Correct Answer: C

Explanation:

Force = 90 × 20 = 1800 N

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Question (25)

QN002255

Which statement about high-speed winds is true?

(A) They increase surrounding air pressure
(B) They lower surrounding air pressure
(C) They stop air pressure completely
(D) They create equal pressure everywhere

Correct Answer: B

Explanation:

High-speed winds lower air pressure.

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Question (26)

QN002256

A roof area of 10 m² experiences a pressure difference of 120 Pa. Find the total force acting upward.

(A) 12 N
(B) 120 N
(C) 1200 N
(D) 12000 N

Correct Answer: C

Explanation:

Force = 120 × 10 = 1200 N

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Question (27)

QN002257

During strong storms, air pressure inside a closed house may become:

(A) Lower than outside
(B) Higher than outside
(C) Equal to outside always
(D) Zero

Correct Answer: B

Explanation:

Outside pressure decreases during storms.

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Question (28)

QN002258

Fast-moving air creates lower pressure mainly because:

(A) Air particles spread out more
(B) Air becomes solid
(C) Gravity disappears
(D) Water vapour freezes

Correct Answer: A

Explanation:

Rapid movement spreads air particles apart.

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Question (29)

QN002259

A moving wind exerts 720 N force over an area of 9 m². Determine the pressure.

(A) 8 Pa
(B) 40 Pa
(C) 80 Pa
(D) 6480 Pa

Correct Answer: C

Explanation:

Pressure = 720 ÷ 9 = 80 Pa

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Question (30)

QN002260

Which real-life situation is directly related to lowering of pressure by fast-moving air?

(A) Ice melting in sunlight
(B) Opening of parachute
(C) Roofs blown away during storms
(D) Rust formation on metals

Correct Answer: C

Explanation:

Storm winds create low pressure above roofs.

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Question (21)

A force of 840 N acts due to moving air over an area of 14 m². Find the pressure.

Explanation:

Link:

Question (22)

Lower air pressure is associated with:

Explanation:

Link:

Question (23)

Why do roofs experience an upward force during storms?

Explanation:

Link:

Question (24)

A wind creates pressure of 90 Pa on an area of 20 m². Calculate the force.

Explanation:

Link:

Question (25)

Which statement about high-speed winds is true?

Explanation:

Link:

Question (26)

A roof area of 10 m² experiences a pressure difference of 120 Pa. Find the total force acting upward.

Explanation:

Link:

Question (27)

During strong storms, air pressure inside a closed house may become:

Explanation:

Link:

Question (28)

Fast-moving air creates lower pressure mainly because:

Explanation:

Link:

Question (29)

A moving wind exerts 720 N force over an area of 9 m². Determine the pressure.

Explanation:

Link:

Question (30)

Which real-life situation is directly related to lowering of pressure by fast-moving air?

Explanation:

Link:

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