Fluid Mechanics MCQ Set 2
FLUID MECHANICS MCQ SET 2
Q1. The pressure at a point in a static fluid is:
A) Same in all directions
B) Different in all directions
C) Zero
D) Maximum at the surface
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Answer: A) Same in all directions
Explanation: In a stationary fluid, pressure acts equally in all directions at a point.
Q2. The instrument used to measure fluid pressure is called:
A) Thermometer
B) Manometer
C) Barometer
D) Flow meter
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Answer: B) Manometer
Explanation: Manometers measure fluid pressure using a column of liquid, commonly mercury or water.
Q3. The ratio of inertia force to viscous force is:
A) Froude Number
B) Reynolds Number
C) Mach Number
D) Weber Number
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Answer: B) Reynolds Number
Explanation: Reynolds Number = (Inertia Force / Viscous Force); used to predict flow regime.
Q4. The streamline and pathline are identical in:
A) Steady flow
B) Unsteady flow
C) Turbulent flow
D) Compressible flow
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Answer: A) Steady flow
Explanation: In steady flow, velocity at a point does not change with time, so streamlines and pathlines coincide.
Q5. A flow in which density remains constant is called:
A) Steady flow
B) Compressible flow
C) Incompressible flow
D) Uniform flow
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Answer: C) Incompressible flow
Explanation: When fluid density does not vary with pressure, it is termed incompressible.
Q6. The point at which the total head is maximum is called:
A) Stagnation point
B) Critical point
C) Velocity head
D) Dynamic point
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Answer: A) Stagnation point
Explanation: At a stagnation point, fluid velocity becomes zero and pressure is maximum.
Q7. A Venturi meter is used to measure:
A) Fluid pressure
B) Fluid flow rate
C) Fluid viscosity
D) Temperature
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Answer: B) Fluid flow rate
Explanation: The Venturi meter uses pressure difference to determine the discharge in a pipeline.
Q8. Surface tension acts:
A) Perpendicular to surface
B) Tangential to surface
C) Upward
D) Downward
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Answer: B) Tangential to surface
Explanation: Surface tension acts along the surface and tries to minimize surface area.
Q9. Capillary rise is due to:
A) Adhesion
B) Cohesion
C) Both A and B
D) Viscosity
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Answer: C) Both A and B
Explanation: Adhesion pulls liquid up the walls, while cohesion maintains the rise of the liquid column.
Q10. The flow of fluid in a pipe is said to be laminar if Reynolds number is:
A) < 2000
B) Between 2000–4000
C) > 4000
D) None
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Answer: A) < 2000
Explanation: For Re < 2000, viscous forces dominate, and the flow remains smooth and orderly.