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Fluid Statics – MCQ Set with Explanations

 

MCQ Set with Explanations

Fluid Statics

1. Pressure at a point in a static fluid acts: 

  • A) Vertically

  • B) Horizontally

  • C) At an angle

  • D) Equally in all directions

Answer: D Explanation: In a fluid at rest, pressure is isotropic — it acts equally in all directions.

2. Hydrostatic pressure varies with:

  • A) Density only

  • B) Depth only

  • C) Density and depth

  • D) Temperature only

Answer: C Explanation: p=ρgh, so pressure depends on both density and depth.

3. Pascal’s law states that:

  • A) Pressure increases with velocity

  • B) Pressure at a point is zero

  • C) Pressure applied to a confined fluid is transmitted equally

  • D) Pressure depends on area

Answer: C Explanation: Pascal’s law applies to fluids at rest in a closed container.

4. The pressure at the bottom of a tank containing water is:

  • A) Same everywhere

  • B) Maximum at the bottom

  • C) Maximum at the top

  • D) Zero

Answer: B Explanation: Pressure increases with depth.

5. A manometer is used to measure:

  • A) Temperature

  • B) Velocity

  • C) Pressure difference

  • D) Density

Answer: C Explanation: Manometers measure pressure difference using a liquid column.

6. The point where the total hydrostatic pressure acts is called:

  • A) Centre of gravity

  • B) Centre of pressure

  • C) Centroid

  • D) Pressure head

Answer: B Explanation: Centre of pressure is the point of action of resultant hydrostatic force.

7. Buoyant force is equal to:

  • A) Weight of the body

  • B) Weight of displaced fluid

  • C) Volume of the body

  • D) Density of fluid

Answer: B Explanation: Archimedes’ principle: buoyant force = weight of displaced fluid.

8. A floating body is stable when:

  • A) Centre of gravity is above metacentre

  • B) Centre of gravity is below metacentre

  • C) Centre of pressure is above metacentre

  • D) Metacentre is below centre of gravity

Answer: B Explanation: For stability, metacentre must be above the centre of gravity.

9. Gauge pressure is:

  • A) Absolute pressure + atmospheric pressure

  • B) Absolute pressure – atmospheric pressure

  • C) Atmospheric pressure only

  • D) Vacuum pressure only

Answer: B Explanation: Gauge pressure = absolute pressure – atmospheric pressure.

10. The unit of pressure head is:

  • A) Pascal

  • B) Newton

  • C) Meter

  • D) kg/m³

Answer: C Explanation: Pressure head is expressed as height of fluid column → meters.



 

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