Hydraulics and Fluid Mechanics MCQ Test - Set 04 - ObjectiveBooks

# Practice Test: Question Set - 04

1. When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
(A) Remains horizontal
(B) Becomes curved
(C) Falls on the front end
(D) Falls on the back end

2. A pressure of 25 m of head of water is equal to
(A) 25 kN/ m²
(B) 245 kN/ m²
(C) 2500 kN/m²
(D) 2.5 kN/ m²

3. The hammer blow in pipes occurs when
(A) There is excessive leakage in the pipe
(B) The pipe bursts under high pressure of fluid
(C) The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
(D) The flow of fluid through the pipe is gradually brought to rest by closing of the valve

4. The resultant upward pressure of the fluid on an immersed body is called
(A) Up-thrust
(B) Buoyancy
(C) Center of pressure
(D) All the above are correct

5. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
(A) Narrow-crested weir
(C) Ogee weir
(D) Submerged weir

6. If the surface of liquid is convex, men
(A) Cohesion pressure is negligible
(B) Cohesion pressure is decreased
(C) Cohesion pressure is increased
(D) There is no cohesion pressure

7. The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is
(A) ρ ω2 r2
(B) 2ρ ω2 r2
(C) ρ ω2 r2/2
(D) ρ ω2 r2/4

8. The atmospheric pressure with rise in altitude decreases
(A) Linearly
(B) First slowly and then steeply
(C) First steeply and then gradually
(D) Unpredictable

9. The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
(A) μπ²NR/60t
(B) μπ²NR²/60t
(C) μπ²NR³/60t
(D) μπ²NR⁴/60t

10. Dynamic viscosity of most of the gases with rise in temperature
(A) Increases
(B) Decreases
(C) Remain unaffected
(D) Unpredictable

11. According to Bernoulli's equation
(A) Z + p/w + v²/2g = constant
(B) Z + p/w - v²/2g = constant
(C) Z - p/w + v²/2g = constant
(D) Z - p/w - v²/2g = constant

12. Center of buoyancy is the
(A) Centroid of the displaced volume of fluid
(B) Center of pressure of displaced volume
(C) Does not exist
(D) None of the above

13. The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)
(A) 4μvl/wd²
(B) 8μvl/wd²
(C) 16μvl/wd²
(D) 32μvl/wd²

14. For a body floating in a liquid the normal pressure exerted by the liquid acts at
(A) Bottom surface of the body
(B) C.G. of the body
(C) Metacenter
(D) All points on the surface of the body

15. Newton's law of viscosity is a relationship between
(A) Pressure, velocity and temperature
(B) Shear stress and rate of shear strain
(C) Shear stress and velocity
(D) Rate of shear strain and temperature

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