Centre of buoyancy always_________________?

Related Mcqs:

1. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is________________?

   A. 5kN
   B. lOkN
   C. 15 kN
   D. 20 kN

2. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?

   A. 22.5 m/sec
   B. 33 m/sec
   C. 40 m/sec
   D. 90 m/sec

3. Ay between two stream lines represents________________?

   A. velocity
   B. discharge
   C. head
   D. pressure

4. Separation of flow occurs when_________________?

   A. the pressure intensity reaches a minimum
   B. the cross-section of a channel is reduced
   C. the boundary layer comes to rest
   D. all of the above

5. Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?

   A. less than d
   B. between d and 1.5 d
   C. between 1.5 d and 2d
   D. greater than 2d

6. The maximum thickness of boundary layer in a pipe of radius r is____________________?

   A. 0
   B. r/2
   C. r
   D. 2r

7. The discharge over a broad crested weir is maximum when the depth of flow is_______________?

   A. H/3
   B. H/2
   C. 2 H/5
   D. 2 H/3

   where H is the available head

8. Coefficient of velocity for Borda’s mouth piece running full is________________?

   A. 0.611
   B. 0.707
   C. 0.855
   D. 1.00

9. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?

   A. linearly with radial distance
   B. as the square of the radial distance
   C. inversely as the square of the radial distance
   D. inversely as the radial distance

10. Select the correct statement?

    A. The absolute roughness of a pipe de-creases with time
    B. A pipe becomes smooth after using for long time
    C. The friction factor decreases with time
    D. The absolute roughness increases with time