A manometer connected to a closed tap reads 3.5 x 10^5 N/m2 When the valve is opened, the reading of manometer falls to 3.0 x 10^5 N/m2, then velocity of flow of water is
Correct answer: B. 10 m/s
- A. 100 m/s
- B. 10 m/s
- C. 1 m/s
- D. 10√10m
Explanation
When the valve is opened, the decrease in pressure as shown by the manometer reading indicates an increase in the velocity of the flow of water. This relationship is governed by Bernoulli's equation, where a decrease in pressure corresponds to an increase in velocity. Therefore, the correct answer is 10 m/s. The other options do not accurately reflect the relationship between pressure and velocity in fluid dynamics.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Fluid Dynamics
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
Practise Fluid Dynamics
363 free Fluid Dynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Fluid Dynamics questions
The velocity of kerosene oil in a horizontal pipe is 5 m/s. If g = 10m/s then the height head of oil will be:
Water is moving with a speed of 5.18 ms-1 through a pipe with a cross- sectional area of 4.20 cm3 The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm3 The speed of flow at the lower level is:
Water enters through end A with speed v1 and leaves through end B with speed v2 of a cylindrical tube AB. The tube is always completely filled with water. In case I tube is horizontal and in case II it is vertical with end A upwards and in case III it is vertical with end B upwards We have v1=v2 for:
Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3 kg per metre3 and the wing is 10 m long and has an average width of 2m, then the difference of the pressure on the two sides of the wing of :
A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is:
There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm 105N/m2) then the velocity of water flowing from hole is: