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Question (31)

QN002261

A storm creates a pressure difference of 700 Pa on a roof area of 2 m². What force acts upward?

(A) 350 N
(B) 700 N
(C) 1200 N
(D) 1400 N

Correct Answer: D

Explanation:

Force = 700 × 2 = 1400 N

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Question (32)

QN002262

Which factor most directly affects the lowering of air pressure?

(A) Colour of roof
(B) Speed of moving air
(C) Shape of furniture
(D) Temperature of walls only

Correct Answer: B

Explanation:

Air speed affects pressure change.

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Question (33)

QN002263

During a storm, the outside air pressure over a roof becomes 150 Pa less than indoor pressure. If roof area is 6 m², what upward force acts on the roof?

(A) 25 N
(B) 156 N
(C) 900 N
(D) 1200 N

Correct Answer: C

Explanation:

Force = 150 × 6 = 900 N

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Question (34)

QN002264

The main reason for opening doors during severe storms is to:

(A) Allow fresh air inside
(B) Equalize pressure on both sides
(C) Increase indoor temperature
(D) Reduce humidity only

Correct Answer: B

Explanation:

Pressure equalization prevents roof lifting.

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Question (35)

QN002265

If the speed of air above a roof doubles, the pressure there generally:

(A) Increases
(B) Decreases further
(C) Remains same
(D) Becomes zero always

Correct Answer: B

Explanation:

Faster winds create lower pressure.

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Question (36)

QN002266

A wind force of 1000 N acts uniformly on an area of 25 m². Calculate the pressure.

(A) 4 Pa
(B) 25 Pa
(C) 40 Pa
(D) 4000 Pa

Correct Answer: C

Explanation:

Pressure = 1000 ÷ 25 = 40 Pa

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Question (37)

QN002267

Which pair is correctly matched?

(A) High-speed winds — High pressure
(B) Fast-moving air — Lower pressure
(C) Still air — Lower pressure
(D) Closed room — No pressure

Correct Answer: B

Explanation:

Fast-moving air lowers pressure.

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Question (38)

QN002268

The upward force on a roof during storms is caused by:

(A) Pressure difference
(B) Friction only
(C) Gravity only
(D) Temperature difference alone

Correct Answer: A

Explanation:

Pressure difference creates upward force.

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Question (39)

QN002269

A pressure difference of 450 Pa acts across a roof area of 8 m². Find the upward force.

(A) 56.25 N
(B) 450 N
(C) 1800 N
(D) 3600 N

Correct Answer: D

Explanation:

Force = 450 × 8 = 3600 N

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Question (40)

QN002270

Which statement best summarizes the effect of high-speed winds on pressure?

(A) Faster winds create higher pressure
(B) Faster winds create lower pressure
(C) Wind speed does not affect pressure
(D) Pressure disappears in moving air

Correct Answer: B

Explanation:

Faster winds lower air pressure.

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Question (31)

A storm creates a pressure difference of 700 Pa on a roof area of 2 m². What force acts upward?

Explanation:

Link:

Question (32)

Which factor most directly affects the lowering of air pressure?

Explanation:

Link:

Question (33)

During a storm, the outside air pressure over a roof becomes 150 Pa less than indoor pressure. If roof area is 6 m², what upward force acts on the roof?

Explanation:

Link:

Question (34)

The main reason for opening doors during severe storms is to:

Explanation:

Link:

Question (35)

If the speed of air above a roof doubles, the pressure there generally:

Explanation:

Link:

Question (36)

A wind force of 1000 N acts uniformly on an area of 25 m². Calculate the pressure.

Explanation:

Link:

Question (37)

Which pair is correctly matched?

Explanation:

Link:

Question (38)

The upward force on a roof during storms is caused by:

Explanation:

Link:

Question (39)

A pressure difference of 450 Pa acts across a roof area of 8 m². Find the upward force.

Explanation:

Link:

Question (40)

Which statement best summarizes the effect of high-speed winds on pressure?

Explanation:

Link:

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