The pressure at a point in a fluid at rest depends on: MCQ with Answer and Explanation

The pressure at a point in a fluid at rest depends on:
A. Shape of the container
B. Area of the surface
C. Depth below the free surface
D. Volume of the fluid
Answer: Option C
Solution (By JKSSB Mock Tests)
Hydrostatic pressure P = P₀ + ρgh, where h is depth below free surface, ρ fluid density, g gravity. Pressure depends only on depth, not container shape, surface area, or total volume (Pascal's paradox). This is a fundamental result in fluid statics. Memory aid: 'Pressure increases linearly with depth'. Competitive exams often test this independence from container geometry to assess deep understanding versus misconceptions. Always recall that pressure is scalar and acts equally in all directions at a point in static fluid.

Discuss this Question (0)

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

Practice More Physics Questions

Question #1
A solar cell converts
A. Chemical energy to electrical energy
B. Mechanical energy to electrical energy
C. Heat energy to electrical energy
D. Light energy to electrical energy

Correct Answer: Option D


Explanation:
Solar cell (photovoltaic cell) converts sunlight directly into electricity using semiconductor p-n junction. No heat involved. Battery converts chemical to electrical. Thermocouple heat to electrical. Solar energy is renewable.

This question belongs to: Science Physics
Question #2
A bullet of mass 20 g fired from a gun of mass 5 kg with speed 500 m/s. Recoil velocity of gun is
A. 0.5 m/s
B. 2.5 m/s
C. 1 m/s
D. 2 m/s

Correct Answer: Option D


Explanation:
Momentum conservation: 0 = 0.02×500 + 5×v => v = -10/5 = -2 m/s (magnitude 2 m/s).

This question belongs to: Science Physics
Question #3
What is the excess pressure strictly inside a soap bubble of radius R and surface tension T?
A. T / R
B. 4T / R
C. T / 2R
D. 2T / R

Correct Answer: Option B


Explanation:
A liquid drop has only one free surface, so its excess pressure is P = 2T/R. However, a soap bubble in the air has two completely free surfaces (an inner one and an outer one). Because both surfaces exert surface tension forces inward, the total excess pressure inside a soap bubble is exactly double: P = 4T/R.

This question belongs to: Science Physics