Motion of a liquid in a tube is best described by?
A.
Bernoulli theorem
B.
Poiseuille’s equation
C.
Stoke’s law
D.
Archimedes’ principle
Answer: Option B
Explanation:
Poiseuille’s formula gives the volume of a liquid flowing out per second through a horizontal capillary tube of length l, radius r, under a pressure difference p applied across its ends. Q=V/t=(πpr4)/8È l.
The ball attains constant velocity after falling through some distance in oil when the weight of ball gets balanced by upthrust and the upward viscous force.
The rate of flow of liquid through an orifice of a tank does not depend upon?
A.
The size of the orifice
B.
Density of liquid
C.
The height of fluid column
D.
Acceleration due to gravity
Answer: Option D
Explanation:
The rate of flow of liquid through an orifice depends on the size of the orifice, atomising surface area, liquid characteristic. It does not depend on acceleration due to gravity.