Practice Test: Question Set - 01
1. When a body is placed over a liquid, it will sink down if
- (A) Gravitational
force is equal to the up-thrust of the liquid
- (B) Gravitational
force is less than the up-thrust of the liquid
- (C) Gravitational
force is more than the up-thrust of the liquid
- (D) None
of the above
2. The property by virtue of which a liquid opposes relative motion between its different layers is called
- (A) Surface tension
- (B) Coefficient of
viscosity
- (C) Viscosity
- (D) Osmosis
3. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
- (A) Equal to
- (B) Less
than
- (C) More than
- (D) None
of these
4. Euler's dimensionless number relates the following
- (A) Inertial force and
gravity
- (B) Viscous force and
inertial force
- (C) Viscous force and
buoyancy force
- (D) Pressure force and
inertial force
5. When a body floating in a liquid, is displaced slightly, it oscillates about
- (A) C.G. of body
- (B) Center of pressure
- (C) Center of buoyancy
- (D) Metacentre
6. The pressure of the liquid flowing through the divergent portion of a Venturimeter
- (A) Remains
constant
- (B) Increases
- (C) Decreases
- (D) Depends
upon mass of liquid
7. When the Mach number is between __________ the flow is called super-sonic flow.
- (A) 1 and 2.5
- (B) 2.5 and 4
- (C) 4 and 6
- (D) 1 and 6
8. In an immersed body, centre of pressure is
- (A) At the centre of gravity
- (B) Above the centre of
gravity
- (C) Below be centre of
gravity
- (D) Could be above or
below e.g. depending on density of body and liquid
9. A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
- (A) (bd²/12) + x̅
- (B) (d²/12 x̅) + x̅
- (C) b²/12 + x̅
- (D) d²/12 + x̅
10. The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)
- (A) (μπ²N/60t) × (R₁ - R₂)
- (B) (μπ²N/60t) × (R₁² - R₂²)
- (C) μπ²N/60t) × (R₁³ - R₂³)
- (D) (μπ²N/60t) × (R₁⁴ - R₂⁴)
11. Steady flow occurs when
- (A) The direction and
magnitude of the velocity at all points are identical
- (B) The velocity of
successive fluid particles, at any point, is the same at successive periods of
time
- (C) The magnitude and
direction of the velocity do not change from point to point in the fluid
- (D) The fluid particles move in plane or
parallel planes and the streamline patterns are identical in each plane
12. A flow is called super-sonic if the
- (A) Velocity of
flow is very high
- (B) Discharge
is difficult to measure
- (C) Mach
number is between 1 and 6
- (D) None of
these
13. In a forced vortex, the velocity of flow everywhere within the fluid is
- (A) Maximum
- (B) Minimum
- (C) Zero
- (D) Nonzero finite
14. The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface)
- (A) (IG/Ax̅) - x̅
- (B) (IG/x̅) - Ax̅
- (C) (Ax̅/IG) + x̅
- (D) (IG/Ax̅) + x̅
15. Mach number is significant in
- (A) Supersonics, as with
projectiles and jet propulsion
- (B) Full immersion or
completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
- (C) Simultaneous motion through two fluids
where there is a surface of discontinuity, gravity force, and wave making
effects, as with ship's hulls
- (D) All of the above
Next Tests: