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Shilpa

HomeAuthor: ShilpaPage 10

26. Water is flowing through a tube of non-uniform cross-section ratio of the radius at entry and exit end of the pipe is 3 : 2. Then the ratio of velocities at entry and exit of liquid is

(a)   4 : 9                                     (b)  9 : 4 (c)   8 : 27                                  (d)  1 : 1 Answer-a (13)

25. The Reynolds number of a flow is the ratio of

(a)  Gravity to viscous force (b)  Gravity force to pressure force (c)   Inertia forces to viscous force (d)  Viscous forces...

23. In a laminar flow the velocity of the liquid in contact with the walls of the tube is

(a)  Zero (b)  Maximum (c)   In between zero and maximum (d)  Equal to critical velocity Answer-a (6)

22. We have two (narrow) capillary tubes

T1 and T2. Their lengths are l1 and l2 and radii of cross-section are r1 and r2 The rate of...

21. A liquid is flowing in a horizontal uniform capillary tube under a constant pressure difference P. The value of pressure for which the rate of flow of the liquid is doubled when the radius and length both are doubled is

(a)   P                                     ...

18. Two drops of the same radius are falling through air with a steady velocity of 5 cm per sec. If the two drops coalesce, the terminal velocity would be

(a)  10 cm per sec                            (b)  2.5 cm per sec (c) 5×4¹/3   per sec             ...

20. The rate of steady volume flow of water through a capillary tube of length ‘l’ and radius ‘r’ under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)

(a)   V/16                                     (b) ...

19. A ball of radius r and density ρ falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is η, the value of h is given by

(a)  (2/9)r2[(1- ρ)/η]g (b)    (2/81)r2[(ρ- 1)/η]g (c)    (2/81)r4[(ρ- 1)/η]2 g (d)    (2/9)r4[(ρ- 1)/η]2 g Answer-c (8)

18. A rectangular block is 5 cm × 5 cm × 10cm in size. The block is floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occur in the level of water?

(a)  No change (b)   It will rise (c)   It will fall (d)   It may rise or fall depending on the...

17. A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is

(a) Greater than the work done by air friction in the second 100 m (b)  Less than the work done...

16. Spherical balls of radius ‘r’ are falling in a viscous fluid of viscosity

‘η‘ with a velocity ‘v‘. The retarding viscous force acting on the spherical ball is (a) Inversely proportional to ‘r‘...

15. A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is

(a)  0.1                                     ...

13. A cylindrical tank has a hole of 1 cm2 in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of

70 cm3/sec. then the maximum height up to which water can rise in the tank is (a)   2.5 cm                                        (b) ...

13. There is a hole of area A at the bottom of cylindrical vessel. Water is filled up to a height h and water flows out in t second. If water is filled to a height 4h, it will flow out in time equal to

(a)   t                                     ...

12. There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm

(1 atm = 105N/m2) then the velocity of water flowing from hole is (a)  √400 m/s            ...

11. A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is

(a)      10                                  (b)  20...

10. A large tank filled with water to a height ‘h’ is to be emptied through a small hole at the bottom. The ratio of time taken for the level of water to fall from h to h/2 and from h/2 to zero is

(a) √2                                  (b) 1/...

8. A manometer connected to a closed tap reads

3.5 × 105 N/m2. When the valve is opened, the reading of manometer falls to 3.0 × 105 N/m2, then...

5. Water is moving with a speed of

5.18 ms–1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the...

10. Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3

kg per metre3 and the wing is 10 m long and has an average width of 2 m, then the...

7. In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the

(a)  Height of the liquid in the tube A is maximum (b)   Height of the liquid in the tubes A...

6. The velocity of kerosene oil in a horizontal pipe is 5 m/s.

If  g=10 m/s2 then the velocity head of oil will be (a)   1.25 m                                             (b)   12.5 m (c)   0.125 m ...

20. Two solids A and B float in water. It is observed that A floats with 1/2 of its body immersed in water and B floats with 1/4 of its volume above the water level. The ratio of the density of A to that of B is

(a)    4 : 3                               ...

19. A ball whose density is

0.4 × 103 kg/m3 falls into water from a height of 9 cm . To what depth does the ball...

17. A hollow sphere of volume V is floating on water surface with half immersed in it. What should be the minimum volume of water poured inside the sphere so that the sphere now sinks into the water

(a)   v/2                                     ...

20. A triangular lamina of area A and height h is immersed in a liquid of density

ρ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is...

24. With rise in temperature, density of a given body changes according to one of the following relations

(a)    ρ= ρ0 [1+ (λd θ)]                       (b)  ρ= ρ0 [1- (λd...

23. The density

ρ of water of bulk modulus B at a depth y in the ocean is related to the density at surface...

22. If two liquids of same volume but different densities

ρ1 and ρ2 are mixed, then density of mixture is given by (a) ρ=  (ρ1 +  ρ2) /2       ...

25. Three liquids of densities and are mixed in equal volumes. Then the density of the mixture is

(a)  d                                     ...

27. From the adjacent figure, the correct observation is

(a)  The pressure on the bottom of tank (a) is greater than at the bottom of (b). (b)   The pressure...

30. Air is blown through a hole on a closed pipe containing liquid. Then the pressure will

(a)   Increase on sides (b)   Increase downwards (c)   Increase in all directions (d)   Never increases Answer-c (6)

8. A silver ingot weighing 2.1 kg is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of silver is 10.5. The tension in the string in kg-wt is

(a)   1.6                                     ...

9. A sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in liquid. Then relative density (RD) of

(a)   Metal is 3                                       (b)   Metal is 7 (c)   Liquid is 3                 ...

13. A block of steel of size 5 cm × 5 cm × 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is

(a)   6 × 5 × 5 × 5 gf                              (b)   4 × 4 × 4 × 7 gf (c)   5...

14. A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

(a)   It will slowly come back to its earlier position (b)   It will remain submerged, where it is left (c)  ...

16. A solid sphere of density

η ( > 1) times lighter than water is suspended in a water tank by a string tied to its base...

15. A cork is submerged in water by a spring attached to the bottom of a bowl. When the bowl is kept in an elevator moving with acceleration downwards, the length of spring

(a)  Increases                                       (b)   Decreases (c)   Remains unchanged                 (d)   None of these Answer-b  ...

12. Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

(a)   Bernoulli                                        (b)   Archimedes (c)   Boyle                             ...

11. The fraction of a floating object of volume

v0  and density d0  above the surface of a liquid of density d will be (a)   d0 /d     ...
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