CBSE Class 11 Viscosity Worksheet A

1.What is terminal velocity? What is the terminal velocity of a body in a freely falling system?

2. The diameter of ball A is half that of ball B. What will be their ratio of their terminal velocities in water?

3. Find out the dimensions of co-efficient of viscosity? 

4. What is the cause of viscosity in a fluid? How does the flow of fluid depend on viscosity?

5. If eight rain drops each of radius 1 mm are falling through air at a terminal velocity of 5 cm | s. If they coalesce to form a bigger drop, what is the terminal velocity of bigger drop?

6. Why does the cloud seem floating in the sky? 

7. A metal plate 5 cm × 5 cm rests on a layer of castor oil 1 mm thick whose coefficient of viscosity is 1.55 Nsm^-2. What is the horizontal force required to more the plate with a speed of 2 cm | s?

8. A small ball of mass ‘m’ and density ‘d’ dropped in a viscous liquid of density ‘d’. After some time, the ball falls with a constant velocity. What is the viscous force on the ball?

9. Two capillary tubes of length 15 cm and 5 cm and radii 0.06 cm and 0.02 cm respectively are connected in series. If the pressure difference a cross the end faces is equal to the pressure of 15 cm high water column, then find the pressure difference across the →

1) first tube

2) Second tube.

10. A metallic sphere of radius 1 × 10^-3 m and density 1 × 104 kg | m³ enters a tank of water after a free fall through a high ‘h’ in earth’s gravitational field. If its velocity remains unchanged after entering water, determine the value of h.

Given :-

Co-efficient of viscosity of water = 1 × 10^-3 Ns | m²; g = 10 m | s²; density of water = 1 × 10³ kg | m³?

Click on link below to download CBSE Class 11 Viscosity Worksheet A.