Question:-
The mercury manometer is fitted to a pipe. It is mounted on the delivery line of centrifugal pump. One limb of the manometer is connected to the upstream side of the manometer is connected to the upstream side of the pipe at ‘A’ and the other limb at ‘B’, just below the value ‘V’ as shown in the figure. The manometer reading ‘h’ varies with different value positions

Assertion (A) : With gradual closer of the value, the magnitude of ‘h’ will go on increasing and even a situation may arise when mercury will be sucked in by the water flowing around ‘B’
Reason (R): With the gradual closer of the value the pressure at ‘A’ will go on increasing
Option (A)
Both A and R are true and R is the correct explanation of A
Option (B)
Both A and R are true but R is not the correct explanation A
Option(C)
A is true but R is false
Option(D)
A is false but R is true
Correct Option:
(A)
Question Solution:
With gradual closure the value, the value will be restricted the flow of liquid then pressure at A will be increased