The atmosphere exerts pressure because MCQ with Answer and Explanation

Question

Share Report Error

The atmosphere exerts pressure because

A. Air is hot

B. Air is moving

C. Air has mass and is attracted by gravity

D. Air is weightless

Answer: Option C

Solution (By JKSSB Mock Tests)

Air has mass, gravity pulls it, creating weight. Pressure at any point is weight of air column above per unit area. At sea level ~10⁵ Pa. Decreases with altitude.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1

Pressure at depth h in fluid: P = P₀ + ρgh. If depth doubles, pressure increase is:

A. Same

B. Half

C. Double

D. Four times

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Gauge pressure (excluding atmospheric) P_gauge = ρgh ∝ h. Doubling depth doubles gauge pressure. Total pressure P = P₀ + ρgh increases but not exactly double due to P₀ term. Question asks about pressure increase (ρgh part). Memory tip: 'Hydrostatic pressure ∝ depth'. Fundamental fluid statics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2

If a body travels half the distance with speed v1 and remaining half with speed v2, average speed is

A. (v1+v2)/2

B. 2v1v2/(v1+v2)

C. √(v1v2)

D. (v1+v2)/v1v2

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Average speed = total distance / total time = d / ( (d/2)/v1 + (d/2)/v2 ) = 2v1v2/(v1+v2).

This question belongs to: Science Physics

Question #3

The dimensional formula for work is

A. [MLT⁻²]

B. [ML²T⁻¹]

C. [ML²T⁻²]

D. [MLT⁻¹]

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Work = Force × displacement = [MLT⁻²][L] = [ML²T⁻²].

This question belongs to: Science Physics

Explore All Physics MCQs