Fluid Mechanics

481.The discharge through a V-notch weir varies as

1. H^3/2
2. H^1/2
3. H^5/2
4. H^2/3

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482.The distance between metacentre and _________ is called metacentric height.

1. Water surface
2. Centre of gravity
3. Centre of buoyancy
4. None of these

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483.The distribution of shear stress in a stream of fluid in a circular tube is

1. Linear with radius for turbulent flow only
2. Linear with radius for laminar flow only
3. Linear with radius for both laminar & turbulent flow
4. Parabolic with radius for both laminar & turbulent flow

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484.The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10^-6m²/s).

1. 24000
2. 24
3. 0.24
4. 0.44

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485.The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids

1. Having high viscosities
2. Moving at low velocities
3. Both (A) & (B)
4. Neither (A) nor (B)

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486.The energy equation, E + (p/ρ) + (v²/2g) + gZ = constant (E = internal energy/mass), is applicable to

1. Perfect gases only
2. Isothermal flow of gases
3. Adiabatic unsteady flow of gases
4. All compressible fluids

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487.The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the

1. Length is shorter
2. Throat diameter is more
3. Sudden expansion of flow in the downstream occurs
4. Distance between the throat and the inlet is more

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488.The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is __________ the mean velocity of flow.

1. Directly proportional to
2. Directly proportional to square of
3. Inversely proportional to
4. Inversely proportional to square of

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489.The equation f^-0.5 = 4.07 log_e (N_Re √f)^-0.6 is called the _________.

1. Colebrook formula
2. Von-Karman equation
3. Fanning equation
4. None of these

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490.The equation relating friction factor to Reynold number, f^-0.5 = 4 log_e (N_Re/√f)^-0.4, is called the _________ equation.

1. Nikuradse
2. Von-Karman
3. Blasius
4. Colebrook

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