Question

Which of the following statements are correct ?
1. Depression of mercury in a capillary tube is dependent on density and surface tension.
2. Modelling of flow-induced drag on a ship is done invoking both of Froude number and Reynolds number.
3. Flow of a fluid in a narrow pipe is relatable to both Reynolds number and Cauchy number.
4. Formation and collapse of a bubble is analyzed through employing surface tension and external pressure.
5. Flow over the downstream slope of an ogee spillway can be affected can be affected by surface tension.
Select the correct answer using the codes given below:

• A. 1, 2 and 4
• B. 1, 3 and 5
• C. 2, 3 and 4
• D. 3, 4 and 5

Answer 1

The correct option is A 1, 2 and 4

$\bullet$ $Capillarytubedepression=\frac{4\sigma }{8d}$
dependent on surface tension density and diameter of tube.

$\bullet$ In modelling of flow induced drag is done invoking both Froude no. and Reynold's no.

$\bullet$ Flow of a fluid in a narrow pipe mainly relatable to Reynold's no. Cauchy number is square to Mach no. and mainly used for compressible liquids.

$\bullet$ Flow over the downstream slope of an Ogee spillway is affected by Froude no.