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Question (21)

QN002161

A pressure of 80 Pa acts on an area of 5 m². Find the force.

(A) 16 N
(B) 40 N
(C) 400 N
(D) 800 N

Correct Answer: C

Explanation:

Force = 80 × 5 = 400 N

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Question (22)

QN002162

In the paper plate activity, lifting became harder with unfolded chart paper because:

(A) Its weight increased
(B) Atmospheric pressure acted over larger area
(C) Gravity became stronger
(D) Friction increased

Correct Answer: B

Explanation:

Larger area experiences greater atmospheric force.

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Question (23)

QN002163

Which statement is correct about air pressure?

(A) Air exerts no pressure
(B) Air exerts pressure only upward
(C) Air exerts pressure in all directions
(D) Air exerts pressure only in closed rooms

Correct Answer: C

Explanation:

Air exerts pressure in all directions.

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Question (24)

QN002164

A rubber sucker sticks to a smooth surface because:

(A) Friction alone acts
(B) Pressure inside sucker becomes higher
(C) Atmospheric pressure outside is greater
(D) Gravity pulls it downward

Correct Answer: C

Explanation:

Higher atmospheric pressure outside presses the sucker.

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Question (25)

QN002165

Which practical unit of air pressure is equal to 100 Pa?

(A) Joule
(B) Millibar
(C) Newton
(D) Dyne

Correct Answer: B

Explanation:

1 millibar = 100 Pa.

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Question (26)

QN002166

Air moves from a region of:

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

Correct Answer: C

Explanation:

Air always flows from high pressure to low pressure.

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Question (27)

QN002167

Two balloons are connected by a straw. One balloon is inflated and the other is empty. Air flows because:

(A) Both have same pressure
(B) Inflated balloon has lower pressure
(C) Inflated balloon has higher pressure
(D) Straw creates vacuum

Correct Answer: C

Explanation:

Air flows from higher pressure to lower pressure.

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Question (28)

QN002168

High-speed winds are accompanied by:

(A) Higher air pressure
(B) Lower air pressure
(C) No pressure change
(D) Equal pressure everywhere

Correct Answer: B

Explanation:

High-speed winds create low pressure areas.

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Question (29)

QN002169

Roofs may blow away during storms because:

(A) Pressure above roof becomes lower than inside
(B) Pressure above roof becomes higher than inside
(C) Gravity decreases
(D) Temperature becomes zero

Correct Answer: A

Explanation:

Higher inside pressure can lift weak roofs.

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Question (30)

QN002170

An elephant weighing 24000 N stands on four feet. Area of one foot is 0.2 m². Find the pressure exerted on the ground.

(A) 15000 Pa
(B) 30000 Pa
(C) 60000 Pa
(D) 120000 Pa

Correct Answer: B

Explanation:

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Question (21)

A pressure of 80 Pa acts on an area of 5 m². Find the force.

Explanation:

Link:

Question (22)

In the paper plate activity, lifting became harder with unfolded chart paper because:

Explanation:

Link:

Question (23)

Which statement is correct about air pressure?

Explanation:

Link:

Question (24)

A rubber sucker sticks to a smooth surface because:

Explanation:

Link:

Question (25)

Which practical unit of air pressure is equal to 100 Pa?

Explanation:

Link:

Question (26)

Air moves from a region of:

Explanation:

Link:

Question (27)

Two balloons are connected by a straw. One balloon is inflated and the other is empty. Air flows because:

Explanation:

Link:

Question (28)

High-speed winds are accompanied by:

Explanation:

Link:

Question (29)

Roofs may blow away during storms because:

Explanation:

Link:

Question (30)

An elephant weighing 24000 N stands on four feet. Area of one foot is 0.2 m². Find the pressure exerted on the ground.

Explanation:

Link:

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