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Question (1)

QN002171

Atmospheric pressure is the pressure exerted by:

(A) Water vapour only
(B) Air surrounding the Earth
(C) Oxygen gas only
(D) Nitrogen gas only

Correct Answer: B

Explanation:

Atmospheric pressure is exerted by the surrounding air.

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Question (2)

QN002172

The envelope of air surrounding the Earth is called:

(A) Hydrosphere
(B) Lithosphere
(C) Atmosphere
(D) Biosphere

Correct Answer: C

Explanation:

The layer of air around Earth is called atmosphere.

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Question (3)

QN002173

Which gas is present in the largest amount in atmospheric air?

(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon

Correct Answer: C

Explanation:

Nitrogen is the major component of air.

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Question (4)

QN002174

A force of 450 N acts on an area of 9 m² due to air pressure. Find the pressure.

(A) 25 Pa
(B) 50 Pa
(C) 75 Pa
(D) 4050 Pa

Correct Answer: B

Explanation:

Pressure = 450 ÷ 9 = 50 Pa

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Question (5)

QN002175

In the paper plate activity, more effort was needed to lift the plate with unfolded chart paper because:

(A) The chart paper became heavier
(B) Air pressure acted on a larger area
(C) Friction increased greatly
(D) The stick became loose

Correct Answer: B

Explanation:

Larger area experiences greater atmospheric force.

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Question (6)

QN002176

Atmospheric pressure acts on:

(A) Liquids only
(B) Solids only
(C) Gases only
(D) All objects

Correct Answer: D

Explanation:

Air exerts pressure on all objects.

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Question (7)

QN002177

A pressure of 120 Pa acts on an area of 5 m². What is the force due to air pressure?

(A) 24 N
(B) 60 N
(C) 600 N
(D) 125 N

Correct Answer: C

Explanation:

Force = Pressure × Area = 120 × 5 = 600 N

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Question (8)

QN002178

A balloon expands in all directions when air is blown into it because:

(A) Air has no weight
(B) Air exerts pressure in all directions
(C) Balloon rubber attracts air
(D) Gravity pushes the balloon outward

Correct Answer: B

Explanation:

Air pressure acts in all directions.

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Question (9)

QN002179

What happens when an inflated balloon is left open?

(A) Air enters the balloon
(B) Air pressure outside becomes zero
(C) Air escapes from the balloon
(D) Balloon becomes heavier

Correct Answer: C

Explanation:

Air escapes from the region of higher pressure.

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Question (10)

QN002180

A pressure of 300 Pa acts on a surface. If the area is 4 m², calculate the force exerted by air.

(A) 75 N
(B) 1200 N
(C) 304 N
(D) 600 N

Correct Answer: B

Explanation:

Force = 300 × 4 = 1200 N

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Question (1)

Atmospheric pressure is the pressure exerted by:

Explanation:

Link:

Question (2)

The envelope of air surrounding the Earth is called:

Explanation:

Link:

Question (3)

Which gas is present in the largest amount in atmospheric air?

Explanation:

Link:

Question (4)

A force of 450 N acts on an area of 9 m² due to air pressure. Find the pressure.

Explanation:

Link:

Question (5)

In the paper plate activity, more effort was needed to lift the plate with unfolded chart paper because:

Explanation:

Link:

Question (6)

Atmospheric pressure acts on:

Explanation:

Link:

Question (7)

A pressure of 120 Pa acts on an area of 5 m². What is the force due to air pressure?

Explanation:

Link:

Question (8)

A balloon expands in all directions when air is blown into it because:

Explanation:

Link:

Question (9)

What happens when an inflated balloon is left open?

Explanation:

Link:

Question (10)

A pressure of 300 Pa acts on a surface. If the area is 4 m², calculate the force exerted by air.

Explanation:

Link:

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