Question:-
If z is vertically upwards r is the density and g gravitational acceleration (see figure) then the pressure (rp/rz) in fluid at rest due to gravity is given by

Option (A)
rgz2/2
Option (B)
-rg
Option(C)
-rgz
Option(D)
rg/z
Correct Option:
(B)
Question Solution:
The pressure intensity P at any point in a mass of fluid does not vary in x and y directions and it varies only z direction
\ (P/z) = - rg
The minus sign in the above equation signifies that the pressure decreases in the direction in which z increases i.e. in the upward direction
question-answer-faq-3042