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Question (11)

QN0028946

Why are dams thicker at the bottom than at the top?

(A) Water pressure increases with depth
(B) Water pressure decreases with depth
(C) Gravity becomes less at lower depth
(D) Bottom water has less density

Correct Answer: A

Explanation:

Greater depth produces greater pressure.

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Question (12)

QN0028947

A pressure difference of 500 Pa acts over a roof area of 4 m² during a storm. Calculate the upward force.

(A) 500 N
(B) 1000 N
(C) 1500 N
(D) 2000 N

Correct Answer: D

Explanation:

Force = 500 × 4 = 2000 N

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Question (13)

QN0028948

Which safety measure is correct during lightning?

(A) Standing under a tree
(B) Using electrical appliances
(C) Staying indoors
(D) Holding metal objects

Correct Answer: C

Explanation:

Indoors is safer during lightning.

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Question (14)

QN0028949

A force of 960 N acts uniformly on an area of 24 m². Determine the pressure.

(A) 20 Pa
(B) 30 Pa
(C) 40 Pa
(D) 50 Pa

Correct Answer: C

Explanation:

Pressure = 960 ÷ 24 = 40 Pa

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Question (15)

QN0028950

Cyclones generally form over oceans because oceans provide:

(A) Dry air only
(B) Warm moist air and energy
(C) Snowfall conditions
(D) Cold pressure systems

Correct Answer: B

Explanation:

Warm oceans supply energy for cyclones.

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Question (16)

QN0028951

Why do sharp knives cut better than blunt knives?

(A) Sharp knives have larger area
(B) Sharp knives produce less pressure
(C) Sharp knives produce greater pressure due to smaller area
(D) Sharp knives reduce force

Correct Answer: C

Explanation:

Smaller contact area increases pressure.

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Question (17)

QN0028952

A storm creates a pressure of 250 Pa on an area of 14 m². Find the total force acting.

(A) 1500 N
(B) 2500 N
(C) 3500 N
(D) 4500 N

Correct Answer: C

Explanation:

Force = 250 × 14 = 3500 N

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Question (18)

QN0028953

Thunder is produced due to:

(A) Reflection of light
(B) Sudden expansion of heated air
(C) Collision of clouds only
(D) Falling raindrops

Correct Answer: B

Explanation:

Lightning heats air rapidly causing expansion.

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Question (19)

QN0028954

Which region of a cyclone experiences calm weather?

(A) Eyewall
(B) Outer bands
(C) Eye
(D) Rain belt

Correct Answer: C

Explanation:

The centre or eye remains relatively calm.

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Question (20)

QN0028955

A force of 4200 N acts over an area of 21 m² during a cyclone. Calculate the pressure.

(A) 100 Pa
(B) 150 Pa
(C) 200 Pa
(D) 250 Pa

Correct Answer: C

Explanation:

Pressure = 4200 ÷ 21 = 200 Pa

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Question (11)

Why are dams thicker at the bottom than at the top?

Explanation:

Link:

Question (12)

A pressure difference of 500 Pa acts over a roof area of 4 m² during a storm. Calculate the upward force.

Explanation:

Link:

Question (13)

Which safety measure is correct during lightning?

Explanation:

Link:

Question (14)

A force of 960 N acts uniformly on an area of 24 m². Determine the pressure.

Explanation:

Link:

Question (15)

Cyclones generally form over oceans because oceans provide:

Explanation:

Link:

Question (16)

Why do sharp knives cut better than blunt knives?

Explanation:

Link:

Question (17)

A storm creates a pressure of 250 Pa on an area of 14 m². Find the total force acting.

Explanation:

Link:

Question (18)

Thunder is produced due to:

Explanation:

Link:

Question (19)

Which region of a cyclone experiences calm weather?

Explanation:

Link:

Question (20)

A force of 4200 N acts over an area of 21 m² during a cyclone. Calculate the pressure.

Explanation:

Link:

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