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:
Correct answer: B. 20
- A. 10
- B. 20
- C. 25.5
- D. 5
Explanation
The correct answer is Option B:20. The velocity of efflux of water through a small hole near the bottom of a container can be calculated using the formula v = sqrt(2gh), where v is the velocity, g is the acceleration due to gravity (approximately 9.81 m/s^2), and h is the height of the water surface above the hole (20 m in this case). Therefore, v = sqrt(2*9.81*20) = sqrt(392) ≈ 19.80 m/s. This explains why Option B is the correct answer. Options A, C, and D are incorrect as they do not align with the correct calculation based on the given information.
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
366 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
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 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
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:
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:
There is a hole of area A at the bottom of cylindrical vessel. Water is filled up to a height 'h' and water flows out in 't' second if water is filled to a height 4h, it will flow out in time equal to
A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of 70 cm3/sec then the maximum height up to which water can rise in the tank is: