Falling drops of water become spheres due to adhesion cohesion surface tension v

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Question
Falling drops of water become spheres due to
Options
A. adhesion
B. cohesion
C. surface tension
D. viscosity.

Correct Answer

surface tension

Hydraulics problems

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3. For solving the problems is hydraulic engineering, the velocity used is
Options
A. velocity at the centre of pipe section
B. average velocity of flow over a section
C. mean of the velocities at the centre and that along the pipe surface
D. none of these.

4. Pick up the incorrect statement from the following :
Options
A. In radial flow, fluid flows such that pressure and velocity at any point change with respect to its distance from the central axis
B. In radial flow, velocity of flow is in a radial direction
C. In radial flow, flow may take place radially inward to or outward from the centre
D. In radial flow, flow is one dimensional with stream lines parallel.

5. A nozzle is fitted at the end of a pipe whose length is 320 m and diameter is 10 cm. If the value of f = 0.01, the diameter of the nozzle for the maximum transmission of power through the nozzle is
Options
A. 2.4 cm
B. 2.5 cm
C. 2.6 cm
D. 2.7 cm.

8. If a pitot tube is placed with its nose facing down stream, the liquid
Options
A. does not rise in the tube
B. rises in the tube to a height
C. falls in the tube to a depth
D. none of these.

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