Physics

Fluid Mechanics

673 Questions

Fluid mechanics is a core physics topic that evaluates the principles of liquid pressure, buoyancy, density, and viscosity through complex numerical problems. The questions require calculating the volume of submerged objects, understanding hydraulic jumps, and applying fundamental fluid statics principles. It is a highly scoring subject for candidates preparing for technical and engineering competitive exams.

Liquid pressure and depthBuoyancy and densityVolume expansionHydraulic jump calculationsSurface tension mechanics

Fluid Mechanics Questions

Multiple choice

The pressure exerted by a fluid at a given point is known as:

  1. Hydrostatic pressure

  2. Dynamic pressure

  3. Total pressure

  4. Gauge pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrostatic pressure is the pressure exerted by a fluid at a given point due to the weight of the fluid above it.

Multiple choice

The equation that describes the relationship between pressure, density, and height in a fluid is known as:

  1. Bernoulli's equation

  2. Pascal's law

  3. Archimedes' principle

  4. Poiseuille's equation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pascal's law states that pressure applied to a fluid in a closed container is transmitted equally to every point in the fluid.

Multiple choice

The force exerted by a fluid on an object immersed in it is known as:

  1. Buoyant force

  2. Drag force

  3. Lift force

  4. Thrust force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Buoyant force is the upward force exerted by a fluid on an object immersed in it. It is equal to the weight of the fluid displaced by the object.

Multiple choice

The force exerted by a fluid on a moving object in the direction opposite to the motion is known as:

  1. Buoyant force

  2. Drag force

  3. Lift force

  4. Thrust force
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Drag force is the force exerted by a fluid on a moving object in the direction opposite to the motion. It is caused by the friction between the fluid and the object.

Multiple choice

The force exerted by a fluid on an object in a direction perpendicular to the motion is known as:

  1. Buoyant force

  2. Drag force

  3. Lift force

  4. Thrust force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lift force is the force exerted by a fluid on an object in a direction perpendicular to the motion. It is caused by the difference in pressure between the two sides of the object.

Multiple choice

The force exerted by a fluid on an object in the direction of the motion is known as:

  1. Buoyant force

  2. Drag force

  3. Lift force

  4. Thrust force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thrust force is the force exerted by a fluid on an object in the direction of the motion. It is caused by the acceleration of the fluid by the object.

Multiple choice

What is the relationship between density and pressure in seawater?

  1. As pressure increases, density increases.

  2. As pressure increases, density decreases.

  3. Pressure has no effect on density.

  4. Density is independent of pressure.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As pressure increases in seawater, its density also increases. This is because the increased pressure forces the water molecules closer together, resulting in a higher mass per unit volume.

Multiple choice

What is the relationship between surface tension and the formation of bubbles?

  1. Surface tension promotes bubble formation.

  2. Surface tension inhibits bubble formation.

  3. Surface tension has no effect on bubble formation.

  4. The relationship depends on the liquid's properties.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Surface tension acts against the expansion of bubbles, making it more difficult for them to form and persist.

Multiple choice

Which flow visualization method involves injecting a dye or tracer into the flow to make it visible?

  1. Particle Image Velocimetry (PIV)

  2. Laser Doppler Velocimetry (LDV)

  3. Smoke Visualization

  4. Schlieren Photography
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Smoke Visualization involves introducing smoke or other visible particles into the flow to trace its movement and patterns.

Multiple choice

Which flow visualization method utilizes a high-speed camera to capture images of tracer particles?

  1. Hot-Wire Anemometry

  2. Laser Doppler Velocimetry (LDV)

  3. Particle Tracking Velocimetry (PTV)

  4. Flow Visualization by Luminescent Paint
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

PTV involves capturing images of tracer particles at high frame rates using a high-speed camera. The movement of these particles is then tracked to obtain velocity information.

Multiple choice

Which flow visualization method involves capturing images of a flow using a high-speed camera?

  1. Schlieren Photography

  2. Flow Visualization by Luminescent Paint

  3. Hot-Wire Anemometry

  4. Particle Image Velocimetry (PIV)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

PIV involves capturing images of a flow using a high-speed camera illuminated by a laser to track the motion of tracer particles.

Multiple choice

Which flow visualization method involves injecting a dye or tracer into the flow to make it visible?

  1. Particle Image Velocimetry (PIV)

  2. Laser Doppler Velocimetry (LDV)

  3. Smoke Visualization

  4. Schlieren Photography
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Smoke Visualization involves introducing smoke or other visible particles into the flow to trace its movement and patterns.

Multiple choice

Which flow visualization method utilizes a high-speed camera to capture images of tracer particles?

  1. Hot-Wire Anemometry

  2. Laser Doppler Velocimetry (LDV)

  3. Particle Tracking Velocimetry (PTV)

  4. Flow Visualization by Luminescent Paint
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

PTV involves capturing images of tracer particles at high frame rates using a high-speed camera. The movement of these particles is then tracked to obtain velocity information.