Mechanical Properties of Fluids Mock Test – Class 11 Physics

1. Two identical tanks stand on the same horizontal platform. Each tank has a small side hole at the same height above the floor. In tank P, the hole is below the water surface, while in tank Q, the hole is below the water surface. Ignoring air resistance and taking the holes as small, the ratio of horizontal ranges of the water streams is

2. A student writes the relative density of a liquid as . The main error is that relative density

3. A fluid is treated as incompressible in a simple calculation when its

4. A viscous liquid flows through a capillary. Its flow rate is . If the tube radius is doubled and the tube length is also doubled, while and remain unchanged, the new flow rate is

5. Study the table and identify the row that uses Archimedes’ principle correctly.

6. The dimensional formula of surface tension is

7. A body floats at rest on a liquid surface. The force balance on the body is

8. Assertion: In an ideal hydraulic press, the pressure at the small piston and the large piston can be the same.
Reason: Pressure applied to an enclosed incompressible fluid is transmitted undiminished in all directions.

9. A formula-choice note says that is being used for a soap bubble, while is being used for capillary rise. The main reason both formulas contain but describe different effects is that

10. A claim says, “A sinking object has no buoyant force acting on it.” The best correction is that a sinking object

11. At a liquid’s critical temperature, surface tension becomes zero because

12. A tank of total water height has a small hole at depth below the free surface. The hole is therefore at height above the ground. Under ideal conditions, the horizontal range of the jet is maximum when

13. Study the table and identify the row that gives the most suitable first meaning.

14. A solid object floats in a liquid when its average density is

15. A body weighs in air, in water, and in another liquid. If the body is fully immersed in both liquids, the relative density of the other liquid with respect to water is

16. A vertical rectangular plate of width is fully submerged with its top edge at the free surface and its bottom edge at depth . In water with and , the average gauge pressure and total force on the plate are

17. The pressure inside a small liquid drop is greater than the pressure outside mainly because of

18. Match the basic quantities with their SI units.

19. Pressure on a horizontal base at the bottom of a liquid can be treated as uniform when

20. Adding detergent to water used in a capillary tube usually lowers the capillary rise because detergent

21. A student identifies surface tension as “force per unit area.” The best correction is that surface tension is

22. A graph is drawn between gauge pressure and depth for a liquid at rest. The straight-line graph passes through the origin. Its slope is

23. A block floats in water with half its volume submerged. When the same block floats in another liquid, only of its volume is submerged. Compared with water, the other liquid is

24. Archimedes’ principle states that the buoyant force on a body immersed in a fluid is equal to

25. A block is suspended from a string and fully immersed in a liquid. If the block is at rest, the tension in the string is

26. Use the graph description below.

The correct relationship between and is

27. A body is fully immersed in a liquid and neither rises nor sinks. This condition is called neutral equilibrium, and it occurs when

28. Atmospheric pressure exists mainly because air

29. A graph is plotted between shear stress and velocity gradient for a Newtonian fluid. The graph is a straight line through the origin. The slope represents

30. The hydrostatic paradox refers to the idea that the pressure at the base of a liquid-filled vessel depends on

31. A wooden block of density floats in water of density . The fraction of its volume submerged is

32. The SI unit of pressure is completed by the relation .

33. A pressure difference of drives laminar flow through a tube. When the pressure difference is increased to without changing , , or , the new flow rate is

34. Study the table and identify the row that gives the best conclusion.

35. A student says, “In a narrower pipe section, water speeds up because water is created there.” The correct idea is that the speed increases because

36. A student reads a manometer and uses the slanted length of the liquid column along the tube instead of the vertical difference between the two free surfaces. The reading will be physically wrong because hydrostatic pressure difference depends on

37. Study the table and identify the correct graph interpretation.

38. If the viscosity of the fluid is doubled while all other quantities in remain the same, the terminal velocity becomes

39. Small raindrops fall slowly compared with large raindrops partly because, in the Stokes-law range, terminal velocity depends on radius as

40. A body of true weight is fully immersed in a liquid and experiences buoyant force . Its apparent weight in the liquid is

41. Study the table and identify the row that gives the correct pressure idea.

42. In applying to a liquid emerging from a tank, represents the

43. A student says, “If surface area increases, surface energy decreases because the liquid surface stretches.” The correct statement is that for positive surface tension, increasing surface area generally

44. The ideal derivation of from Bernoulli’s equation assumes that

45. A large tank is open to the atmosphere and has a small hole below the free surface. Taking , the speed of efflux is

46. A sphere of radius moves through a liquid of viscosity at speed . Using , the Stokes drag is closest to

47. Consider the following statements about pressure variation in a liquid at rest.
Statement I: Gauge pressure increases linearly with depth.
Statement II: At the same depth in the same connected liquid, pressure is the same.
Statement III: The slope of a gauge-pressure versus depth graph is .

48. In a fluid at rest, a small imaginary surface is placed at a point first horizontally and then vertically. The pressure value at that point is

49. A student says, “A hydraulic press multiplies force because it creates energy inside the liquid.” The correct correction is that the press

50. A mercury barometer shows a height of at standard atmospheric pressure. This height means the atmosphere can support