If a water droplet falls from a height in air,its terminal velocity will be attained when the drag force is
Correct answer: D. Equal to the weight of the droplet
- A. Twice the weight of the droplet
- B. Thrice the weight of the droplet
- C. Half of the weight of the droplet
- D. Equal to the weight of the droplet
Explanation
At terminal velocity, a falling object moves at a constant speed because the net force acting on it is zero. This occurs when the drag force, which opposes the motion, equals the gravitational force (weight) acting on the object. Therefore, the correct answer is that the drag force is equal to the weight of the droplet. The other options describe scenarios where the forces are unbalanced, leading to acceleration rather than maintaining a constant velocity.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Terminal Velocity
Terminal velocity is the constant speed reached when gravitational force is balanced by fluid resistance. The topic covers drag, buoyant force, the conditions for zero acceleration, and how viscosity, object size, shape and density affect the limiting speed, with a distinction between free fall before and after terminal velocity.
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 Terminal Velocity questions
All of the following are the factors of which terminal velocity of a falling object depends EXCEPT
All of the following are the factors on which terminal velocity of a falling object depends EXCEPT
Terminal velocity is_____________?
When an object moves with a terminal velocity, then the acceleration of the object will
The object that easily attains the terminal velocity is a
A tiny droplet of oil of density 'ρ' and radius 'r' falls through air under force of gravity. If viscosity of air is 'η', the terminal velocity acquired by the oil drop is given by: