Fluid Mechanics

21. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

  1. 9,000 kg
  2. 13,500 kg
  3. 18,000 kg
  4. 27,000 kg
  5. 30,000 kg.

Correct answer: (B)
13,500 kg

22. A streamline is defined as the line

  1. parallel to central axis flow
  2. parallel to outer surface of pipe
  3. of equal yelocity in a flow
  4. along which the pressure drop is uniform
  5. which occurs in all flows.

Correct answer: (C)
of equal yelocity in a flow

23. According to Bernoulli’s equation for steady ideal fluid flow

  1. principle of conservation of mass holds
  2. velocity and pressure are inversely proportional
  3. total energy is constant throughout
  4. the energy is constant along a stream-line but may vary across streamlines
  5. none of the above.

Correct answer: (D)
the energy is constant along a stream-line but may vary across streamlines

24. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

  1. the weight of the body
  2. more than the weight of the body
  3. less than the weight of the body
  4. weight of the fluid displaced by the body
  5. weight of body plus the weight of the fluid displaced hy the body.

Correct answer: (D)
weight of the fluid displaced by the body

25. Alcohol is used in manometers because

  1. it has low vapour pressure
  2. it is clearly visible
  3. it has low surface tension
  4. it can provide longer column due to low density
  5. is provides suitable meniscus.

Correct answer: (D)
it can provide longer column due to low density

26. All the terms of energy in Bernoulli’s equation have dimension of

  1. energy
  2. work
  3. mass
  4. length
  5. time.

Correct answer: (D)
length

27. An ideal flow of any fluid must fulfill the following

  1. Newton’s law of motion
  2. Newton’s law of viscosity
  3. Pascal’ law
  4. Continuity equation
  5. Boundary layer theory.

Correct answer: (D)
Continuity equation

28. An ideal flow of any fluid must satisfy

  1. Pascal law
  2. Newton’s law of viscosity
  3. boundary layer theory
  4. continuity equation
  5. Bernoulli’s theorem.

Correct answer: (D)
continuity equation

29. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is

  1. 10m/sec2
  2. 9.81 m/sec2
  3. 10.2/m sec
  4. 9.75 m/sec2
  5. 9 m/sec .

Correct answer: (A)
10m/sec2

30. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

  1. 1
  2. 1.2
  3. 0.8
  4. 0.75
  5. 1.25.

Correct answer: (D)
0.75

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