Physics
Fluid Dynamics
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#81 The drag force on an object does not depend on
A) Density of fluid
B) Velocity of object
C) Shape of object
D) Mass of object
#82 The terminal velocity of a raindrop is about
A) 1 m/s
B) 5 m/s
C) 10 m/s
D) 20 m/s
#83 The viscosity of a fluid is a measure of its
A) Density
B) Resistance to flow
C) Compressibility
D) Surface tension
#84 The coefficient of viscosity of air is about
A) \(10^{-3}\) Pa s
B) \(10^{-5}\) Pa s
C) \(10^{-7}\) Pa s
D) \(10^{-9}\) Pa s
#85 The coefficient of viscosity of water at 20°C is about
A) \(10^{-3}\) Pa s
B) \(10^{-5}\) Pa s
C) \(10^{-7}\) Pa s
D) \(10^{-9}\) Pa s
#86 The flow of a fluid is streamline if
A) The velocity is less than critical velocity
B) The velocity is greater than critical velocity
C) The Reynolds number is less than 2000
D) Both A and C
#87 The critical velocity for water flowing in a pipe of diameter 1 cm is about ( \(\eta = 10^{-3}\) Pa s, \(\rho = 10^3\) kg/m³)
A) 0.2 m/s
B) 2 m/s
C) 20 m/s
D) 200 m/s
#88 The work done per unit volume by the pressure difference in a fluid is equal to the sum of changes in
A) K.E. and P.E. per unit volume
B) K.E. and internal energy per unit volume
C) P.E. and internal energy per unit volume
D) K.E., P.E. and internal energy per unit volume
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