physics set 5

Q.7 Stokes' Law is given as:
A) F = 6πηr²v               C) F = 6πηrv^-1
B) F = 6πηrv                 D) F = 6π²ηr³v
Q.8 The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe:
A) Remains constant                  C) Exponentially increases
B) Is zero                                  D) Exponentially decreases
Q.9 A small leak is developed in a large water storage tank. If the height of water above leakage is 10 m, then find the speed of efflux through the leak:
A) 14 m/sec                              C) 9.8 m/sec
B) 10 m/sec                              D) 20 m/sec

Q.12 For the horizontal pipe, the fluid inside it is flowing horizontally then Bernoulli’s equation can be written as
A) P + ρv² = constant                             C) P + 2ρv² = constant
B) 2P + ρv² = constant                           D) 2P + 2ρv² = constant

Q.13 In fluid flow, for the equation of continuity A1v1 = A2v2. If velocity of the fluid at one end is doubled, then what will be the cross-sectional area at this end?
A) Double                                 C) (Half)²
B) Half                                     D) (Double)²