Question

Which of the following forces act on a fluid at rest?              

1. Gravity force

2. Hydrostatic force

3. Surface tension

4. Viscous force

Select the correct answer using the codes given below:

(a) 1, 2, 3 and 4           (b) 1, 2 and 3  

(c) 2 and 4                   (d) 1, 3 and 4