BEST AIMS ACADEMY DERA GHAZI KHAN

(Ch 6 complete)NAME: ---------------------------------- SECTION--------------------------------

1. The equation of continuity was derived on the basis of law of conservation of

a. momentum b. energy c. pressure d. mass2. The dimensions of viscosity are

a. [ML–1 T–1] b. [ML–1 T–2] c. [ML–2 T–1] d. [ML–2 T–

2]

3. The Stokes’ law is applicable only on spherical bodies moving with

a. high velocity b. slow velocity c. variable velocity d. constant

velocity

4. The max drag force on a falling sphere is 9.8 N its weight is

a. 1 N b. 9.8 N c. 19.8 N d. 8.9 N

5. The terminal velocity of an object in a fluid of smaller viscosity is a. large b. small c. zero d. maximum

6. The ‘constant’ in equation of continuity is the flow of a. mass per unit time b. mass per area

c. volume of liquids d. mass per unit volume 7. Which is the fundamental equation of the fluid dynamics?

a. Torricelli’s theorem b. Bernoulli’s equation

c. equation of continuity d. venture relation 8. In case of aero plane, the pressure of air above the wing is

a. greater than on the lower b. equal to on the lower c. less than on the lower d. all above

9. The normal systolic pressure is a. 120 torr b. 180 torr c. 80 torr d.

50 torr10. Viscosity of liquid with rise in temp

a. increases b. decreases c. remains constt d. none

11. When a droplet falls vertically through a viscous medium the drag

force

on the droplet

a. increases with velocity b. decrease with velocity

c. remains constant d. none

12. Terminal velocity is measured by relation

a. 2 sgr3/9 b. 2 sgr/9 c. 2 sgr2/9 d. none

13. If the density of droplet is large then its terminal velocity is

a. minimum b. small c. zero d. large

14. If the viscosity of fluid is small, then terminal velocity is

a. minimum b. small c. zero d. large

16. The streamlines of the fluid

a. can not intersect b. can intersect

c. intersect perpendicularly d. none

17. The frictional effects between different layers of a flowing fluid is

called

a. viscosity b. coefficient of friction

c. thickness of fluid d. none

18. The Stoke’s law is applicable only on

a. elliptical bodies b. spherical bodies

c. rectangular bodies d. cubical bodies