HARD
JEE Main/Advance
IMPORTANT
Earn 100

A spherical ball of radius and density falls freely under gravity through a distance before entering a tank of water. If after entering the water the velocity of the ball does not change, find . Viscosity of water is .

Important Questions on Viscosity and Surface Tension
EASY
JEE Main/Advance
IMPORTANT
An oil drop falls through the air with a terminal velocity of . The radius of the drop will be: .,
Neglect the density of air as compared to oil.

EASY
JEE Main/Advance
IMPORTANT
The terminal velocity of a sphere moving through a viscous medium is:

EASY
JEE Main/Advance
IMPORTANT
A sphere is dropped gently into a medium of infinite extent. As the sphere falls, the force acting downwards on it

EASY
JEE Main/Advance
IMPORTANT
A solid sphere falls with a terminal velocity of in air. If it is allowed to fall in vacuum,

MEDIUM
JEE Main/Advance
IMPORTANT
The following observations were taken for determining surface tension of water by capillary method. Diameter of capillary , rise of water . Using and the simplified relation, , the possible error in surface tension is closest to

MEDIUM
JEE Main/Advance
IMPORTANT
Two hail stones with radii in the ratio of fall from a great height through the atmosphere. Then the ratio of their momentum after they have attained terminal velocity is

EASY
JEE Main/Advance
IMPORTANT
A spherical ball is dropped in a long column of viscous liquid. Which of the following graphs represent the variation of
(i) gravitational force with time.
(ii) viscous force with time.
(iii) net force acting on the ball with time.

EASY
JEE Main/Advance
IMPORTANT
A small steel ball falls through a syrup at constant speed of . If the steel ball is pulled upwards with a force equal to twice its effective weight, how fast will it move upwards?
