In a mercury differential manometer used for measuring pressure differences across a venturimeter in a water pipeline if an error of 1 mm has been made in observing a differential head of 20 mmthe percentage error in pressure difference is
A mercury-water manometer has a gage difference of 0.7 m (difference in elevation of menisci). The difference in pressure measured in metres of water is
A U-tube of uniform cross-section is partially filled with a liquid A. Another liquid B which does not mix with liquid A is pour3ed into one side. It is found that the liquid levels of the two sides of the tube are the same. While the level of liquid A has risen by 2 cm. If the specifics gravity of liquid A is 1.1 the specific gravity of liquid B must be
A tube of length h which is wide enough to make surface tension effects negligible is closed at one end. It is then lowered into a tank of mercury of depth h and the mercury rises to a distance x into the tube. If the mercury barometer stands at h also then
