# Fluid Mechanics MCQ

Below Fluid Mechanics quiz are Multiple Choice Questions (MCQs) type Quiz. These Fluid Mechanics MCQ Questions helps you to refresh your Fluid Mechanics, you can see the correct option by clicking on it. .

• Solid
• Liquid
• Gas
• Fluid
• ### 2. The fluid will rise in capillary when the capillary is placed in fluid, if

• the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules
• the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules
• the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules
• None of the above

• U-bend
• 30° bend
• 45° bend
• 90° bend
• ### 4. Which of the following quantities has the dimensions [M0 L0 T 0]

• Density
• Stress
• Strain
• Strain Rate
• ### 5. The velocity components in x ,y and z directions of a velocity potential function is given by,

• u=∂Φ/∂x, v=∂Φ/∂y,w=∂Φ/∂z
• u=-∂Φ/∂x, v=∂Φ/∂y, w= -∂Φ/∂z
• u=-∂Φ/∂x, v= -∂Φ/∂y,w= -∂Φ/∂z
• u =∂Φ/∂x, v= -∂Φ/∂y,w=∂Φ/∂z
• ### 6. The rate of change of velocity due to change of position of fluid particles in a fluid flow is called as

• normal acceleration
• tangential acceleration
• convective acceleration
• local acceleration
• ### 7. The velocity vector in a fluid flow is given by, V=4x3i-10x2yj+2tk.Find the velocity vector of a fluid particle at (2,1,3) at t=1

• 32i + 40 j-2k
• 32i-40j-2k
• 32i-40j+2k
• -32i+40j+2k
• ### 8. Which of the following contribute to the reason behind the origin of surface tension?

• only cohesive forces
• neither cohesive forces nor adhesive forces
• both cohesive forces and adhesive forces
• ### 9. Which one of the following is the wrong statement about capillarity?Magnitudes depends upon

• The diameter of tube
• The specific weight of the liquid
• Its surface tension
• Its viscosity
• ### 10. If there is bucket full of oil and bucket full of water and you are asked to lift them, which one of the two will require more effort given that volume of buckets remains same?

• Oil bucket
• Water bucket
• Equal effort will be required to lift both of them
• None of the mentioned
• ### 11. If a person studies about a fluid which is at rest, what will you call his domain of study?

• Fluid Mechanics
• Fluid Statics
• Fluid Kinematics
• Fluid Dynamics
• ### 12. Buoyant force is equal to

• upward pressure/downward pressure
• upward pressure + downward pressure
• upward pressure - downward pressure

• helium
• ice
• iron
• gold
• ### 14. Which of the following is NOT a fluid?

• carbon dioxide
• hydrogen
• seawater
• wood
• ### 15. Rise of liquid in a capillary tube is due to

• Cohesion
• Both A & B
• Neither A nor B
• ### 16. Shear stress in a fluid flowing in a round pipe

• Varies parabolically across the cross-section
• Remains constant over the cross-section
• Is zero at the centre and varies linearly with the radius
• Is zero at the wall and increases linearly to the centre

• zero
• unity
• infinity
• very low
• ### 18. The flow in a pipe is laminar when Reynold number is

• less than 2000
• between 2000 and 4000
• more than 4000
• none of these