Quiz  /  Fluid Mechanics Class 12 MCQ Questions With Answers

  • 1. 
    The buoyant force that acts on a 20,000-N ship is

  • somewhat less than 20,000 N.
  • 20,000 N.
  • more than 20,000 N.
  • dependent on whether it is in fresh water or salt water.

  • 2. 
    A system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface area.

  • hydraulic system
  • archimedes system
  • pressure system
  • bernoulli effect

  • 3. 
    The SI unit of pressure

  • Newton
  • Gram
  • Pascal
  • Pound

  • 4. 
    Which of the following is a fluid?

  • helium
  • ice
  • iron
  • gold

  • 5. 
    Bernoulli's equation cannot be used for flow of water in river because the flow is

  • streamlined
  • turbulent
  • laminar
  • viscous

  • 6. 
    A buoyant force is an upward force applied on an object by a

  • Substance
  • Fluid
  • Pressure
  • Displacement

  • 7. 
    Diagram shows the design of a dam. Why does the thickness of the dam increase with its depth?

  • The design of this structure is stronger.
  • Water pressure increases with depth.
  • The cost of construction is lower.
  • Water pressure acts uniformly in all directions.

  • 8. 
    States that as the velocity of a fluid increases, the pressure decreases. This causes planes to fly .

  • Archimedes' Principle
  • Bernoulli's Principle
  • Pascal's Principle

  • 9. 
    Several cans of different sizes and shapes are all filled with the same liquid to the same depth. Then,

  • The pressure on the bottom of each can is the same
  • The weight of the liquid on the bottom of each can is the same
  • The least pressure is at the bottom of the can with the largest bottom area
  • the force of the liquid on the bottom of each can is the same

  • 10. 
    The entrance of a pipe has a cross-sectional area of 0.6 m2, while the exit's area is 0.2 m2. If an ideal fluid enters the pipe at a speed of 1.5 m/s, at what speed does it leaves the pipe?

  • 1.5 m/s
  • 4.5 m/s
  • 45 m/s
  • 6 m/s

  • 11. 
    If you were to smoosh down a piece of bread, what would happen to its mass?

  • it would decrease
  • it would increase
  • it would stay the same

  • 12. 
    Helium balloons rise on earth because

  • helium is less dense than air
  • helium is more dense than air
  • helium is cooler than air
  • helium is warmer than air

  • 13. 
    In a pool you have an apparent weight of 250 N, if there is 70N of force acitng on you, what would be your weight outside of the pool?

  • 70 N
  • 180 N
  • 250 N
  • 320 N

  • 14. 
    This is what happens to an object when the buoyant force is stronger than the gravitational force.

  • sinks
  • floats
  • neutrally buyant
  • I don't know...

  • 15. 
    Where will the pressure be greater - above or below the wing?

  • above
  • below

  • 16. 
    Which would have greater pressure, 2 meters below the surface in an infinite pool, or 2 meters below the surface of an Olympic pool?

  • infinite pool
  • olympic pool
  • they would both be the same

  • 17. 
    According to Bernoulli's theorem in a flowing liquid

  • velocity is inversely proportional to pressure
  • velocity is directly proportional to pressure
  • velocity is directly proportional to volume

  • 18. 
    When pressure is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid. This fact is called________.

  • Pascal's Principle
  • Newton's Principle
  • Archimedes' Principle
  • Bernoulli's Principle

  • 19. 
    Bernoulli's principle states that as the velocity of a fluid ______, the pressure exerted by the fluid ______

  • increases; increases
  • decreases; decreases
  • increases; decreases
  • decreases; increases

  • 20. 
    How do ships float when they are made of tons of metal?

  • they have engines that hold them up
  • the water they displace has a weight greater than that of the ship
  • their density is higher than water
Report Question
warning
access_time
  Time