Hydraulic and Fluid Mechanics

91. An ideal flow of any fluid must satisfy

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

Correct answer: (D)
Continuity equation

92. An internal mouthpiece is said to be running

  1. Free
  2. Partially
  3. Full
  4. None of these

Correct answer: (C)
Full

93. An internal mouthpiece is said to be running free if the length of the mouthpiece is

  1. Less than twice
  2. More than twice
  3. Less than three times
  4. More than three times

Correct answer: (C)
Less than three times

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

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

Correct answer: (A)
10 m/sec2

95. 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

Correct answer: (D)
0.75

96. An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

  1. tanθ = a/g
  2. tanθ = 2a/g
  3. tanθ = a/2g
  4. tanθ = a2/2g

Correct answer: (A)
tanθ = a/g

97. An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be

  1. Equal to
  2. Directly proportional
  3. Inversely proportional
  4. None of these

Correct answer: (B)
Directly proportional

98. An open vessel of water is accelerated up an inclined plane. The free water surface will

  1. Be horizontal
  2. Make an angle in direction of inclination of inclined plane
  3. Make an angle in opposite direction to inclination of inclined plane
  4. Any one of above is possible

Correct answer: (C)
Make an angle in opposite direction to inclination of inclined plane

99. An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

  1. Weir
  2. Notch
  3. Orifice
  4. None of these

Correct answer: (B)
Notch

100. An orifice is said to be large, if

  1. The size of orifice is large
  2. The velocity of flow is large
  3. The available head of liquid is more than 5 times the height of orifice
  4. The available head of liquid is less than 5 times the height of orifice

Correct answer: (D)
The available head of liquid is less than 5 times the height of orifice

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