Physics
Fluid Dynamics
Page 9 of 12
#65 The normal diastolic pressure is about ______ mm of Hg.
A) 80
B) 100
C) 120
D) 140
#66 The blood vessels which carry blood from heart to different parts of the body are called
A) Arteries
B) Veins
C) Capillaries
D) Ventricles
#67 The blood vessels which carry blood from different parts of the body to heart are called
A) Arteries
B) Veins
C) Capillaries
D) Ventricles
#68 The instrument used to measure the speed of an aircraft relative to the air is called
A) Venturimeter
B) Pitot tube
C) Manometer
D) Barometer
#69 The lift of an aircraft is based on
A) Torricelli’s theorem
B) Bernoulli’s principle
C) Stoke’s law
D) Equation of continuity
#70 The drag force on a sphere of radius r moving with velocity v in a fluid of viscosity \(\eta\) is given by
A) \(6 \pi \eta r v\)
B) \(6 \pi \eta r^2 v\)
C) \(6 \pi \eta r v^2\)
D) \(6 \pi \eta v r\)
#71 The terminal velocity of a small sphere of radius r and density \(\rho\) falling in a fluid of density \(\sigma\) and viscosity \(\eta\) is
A) \(\frac{2 r^2 g (\rho - \sigma)}{9 \eta}\)
B) \(\frac{2 r^2 g (\rho + \sigma)}{9 \eta}\)
C) \(\frac{2 r^2 g (\rho - \sigma)}{3 \eta}\)
D) \(\frac{2 r^2 g (\rho + \sigma)}{3 \eta}\)
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