Speed of efflux is V in a tank if the tank is placed on 2m high then speed of efflux will be
Correct answer: D. √2gh
- A. √4gh
- B. √2v
- C. √2gh/2
- D. √2gh
Explanation
The speed of efflux through an orifice at the bottom of a tank is determined by Torricelli's Law, which is derived from Bernoulli's principle. According to this law, the efflux speed V is √(2gh), where g is the acceleration due to gravity, and h is the height of the fluid column above the orifice. The height of the tank itself (such as being placed 2m high) does not affect the speed of efflux unless it changes the height of the fluid column above the orifice. Option A incorrectly assumes an additional factor in the equation. Option B incorrectly modifies V without proper basis, and Option C incorrectly divides the correct formula by 2. Therefore, Option D is the correct answer.
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
A big rain drop having terminal velocity of 32m/sec is divided into eight equal rain drops terminal velocity of each small drop will be
Two rain drops of radii are in the ratio 1:2, then ratio of their terminal velocities is
The speed of a fluid in an aerofoil is √3V and V, its up thrust force is
"t" is the time required to evacuate a tank filled of liquid, time required to evacuate 50% of liquid will be
Two boats moving parallel to each other they will:
Mass flow rate is