help with the following

2. Determine the minimum size of glass tube that can be used to measure water level if the capillary rise in the tube is restricted to 5mm. Consider surface tension of water in contact with air as 0.073 N/m

a) 5.95mm

b) 11.9mm

c) 2.97mm

d) 4.46mm

3. An oil of vicosity 7 poise is used for lubrication between shaft and sleeve. The diameter of shaft is 0.6 m and it rotates is 360 rpm. Calculate the power lost in oil for a sleeve length of 160mm. The thickness of oil film is 1.0mm

a) 25.31 kW

b) 50.62 kW

c) 37.97 kW

d) 12.65 kW

4. Find the capillarity rise or fall if a capillary tube of diameter .03m is immersed in hypothetical fluid with specific gravity 6.5, surface tension 0.25 N/m and angle of contact 147.

a) 0.44mm fall

b) 0.88mm fall

c) 0.44mm rise

d) 0.88mm rise

5. Will capillary rise occur and if it occurs what will be capillary rise if glass capillarity tube is immersed in water and experiment is carried out by astronauts in space.

a) Capillarity rise will not occur

b) Capillarity rise will occur infinitely and will come out in form of fountain

c) Capillarity rise will occur finitely and will be the whole length of tube

d) None of the mentioned

6. The surface tension of fluid in contact with air at 25 is 0.51N/m. The pressure inside a droplet is to be 0.05 N/cm2 greater than outside pressure. Determine the diameter of the droplet of water.

a) 4.08mm

b) 8.16mm

c) 2.04mm

d) None of the mentioned

7. If a fluid of certain surface tension and diameter is used to make soap bubble and a liquid jet. Which of the two, bubble or liquid jet, will have greater pressure difference on the inside and outside.

a) Liquid jet

b) Soap bubble

c) Both will have same pressure differrence

d) None of the mentioned

8. Capillarity fall is reduced if we take the appartus (capillary tube immersed in fluid having acute angle of contact) considerable distance inside the earth( i.e below the earth crust).

a) True

b) False

9. For liquid fluids will capillarity rise (or fall) increase or decrease with rise in temperature.

a) Increase

b) Decrease

c) Remain constant

d) First decrease then increase

10. Cavitation is more pronounced in rough pipes than smooth surfaced pipes.

a) True

b) False