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Viscosity of a liquid - Stoke's method
Viscosity of a liquid - Stoke's method
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1)
Which property measures the resistance of a liquid to flow ?
Viscosity
Density
Solubility
Volume
2)
Which of the following is the correct statement?
Both liquids and gases exhibit viscosity
Viscous force is the force offered by the adjacent liquid layers
All of the above
Viscous force is a frictional force
3)
The rain drops falling from the sky neither hit us hard, nor make holes on the ground. Why?
Because they move with a constant acceleration
Because they move with a variable acceleration
Because they move with a variable speed
Because they move with a constant velocity
4)
Two balls whose radii are in the ratio 1:2 fall from a height of 50 km. What will be the ratio of their terminal velocities ?
9:1
4:1
1:9
1:4
5)
What is the unit of coefficient of viscosity?
None of these
Nsm^-2
N/m^2
Nsm^2
6)
Cooking oil appears to move more fluidly upon a frying pan after being heated on a stove. Why?
Viscosity decreases with increase in temperature
Viscosity of oil increases with increase in temperature
None of these
Viscosity becomes zero as the temperature increases
7)
Which of the following factors are responsible for the viscous force acting on a spherical body?
All the above
Radius of the spherical body
Terminal velocity of the spherical body
Coefficient of viscosity of the liquid
8)
Calculate the viscous force on a ball of radius 1 mm moving through a liquid of viscosity 0.2 Nsm^-2 at a speed of 0.07 m/s?
2.63 N
0.263*10^-4 N
2.63*10^-4 N
None of these
9)
What happens to the viscosity of a liquid when pressure increases ?
Become zero
Increases
Decreases
Remains constant
10)
Choose the incorrect statement from the following.
Viscous force is directly proportional to terminal velocity.
Coefficient of viscosity does not depend on terminal velocity.
Coefficient of viscosity depends on density of the liquid.
Viscous force acts in opposite direction of velocity.