-
question_answer1)
In which one of the following cases will the liquid flow in a pipe be most streamlined [Pb. CET 2005]
A)
Liquid of high viscosity and high density flowing through a pipe of small radius done
clear
B)
Liquid of high viscosity and low density flowing through a pipe of small radius done
clear
C)
Liquid of low viscosity and low density flowing through a pipe of large radius done
clear
D)
Liquid of low viscosity and high density flowing through a pipe of large radius done
clear
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question_answer2)
Two water pipes of diameters 2 cm and 4 cm are connected with the main supply line. The velocity of flow of water in the pipe of 2 cm diameter is [MNR 1980]
A)
4 times that in the other pipe done
clear
B)
\[\frac{1}{4}\] times that in the other pipe done
clear
C)
2 times that in the other pipe done
clear
D)
\[\frac{1}{2}\] times that in the other pipe done
clear
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question_answer3)
An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is
A)
3.0 m/s done
clear
B)
1.5 m/s done
clear
C)
1.0 m/s done
clear
D)
2.25 m/s done
clear
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question_answer4)
Water enters through end A with speed \[{{v}_{1}}\] and leaves through end B with speed \[{{v}_{2}}\] of a cylindrical tube AB. The tube is always completely filled with water. In case I tube is horizontal and in case II it is vertical with end A upwards and in case III it is vertical with end B upwards. We have \[{{v}_{1}}={{v}_{2}}\] for
A)
Case I done
clear
B)
Case II done
clear
C)
Case III done
clear
D)
Each case done
clear
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question_answer5)
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 pipe increase in area to 7.60 cm2. The speed of flow at the lower level is
A)
3.0 ms?1 done
clear
B)
5.7 ms?1 done
clear
C)
3.82 ms?1 done
clear
D)
2.86 ms?1 done
clear
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question_answer6)
The velocity of kerosene oil in a horizontal pipe is 5 m/s. If \[g=10m/{{s}^{2}}\] then the velocity head of oil will be
A)
1.25 m done
clear
B)
12.5 m done
clear
C)
0.125 m done
clear
D)
125 m done
clear
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question_answer7)
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)
B)
Height of the liquid in the tubes A and B is the same done
clear
C)
Height of the liquid in all the three tubes is the same done
clear
D)
Height of the liquid in the tubes A and C is the same done
clear
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question_answer8)
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 velocity of flow of water is
A)
100 m/s done
clear
B)
10 m/s done
clear
C)
1 m/s done
clear
D)
\[10\sqrt{10}\] m/s done
clear
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question_answer9)
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 difference of the pressure on the two sides of the wing of
A)
4095.0 Pascal done
clear
B)
409.50 Pascal done
clear
C)
40.950 Pascal done
clear
D)
4.0950 Pascal done
clear
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question_answer10)
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 \[\frac{h}{2}\] and from \[\frac{h}{2}\] to zero is [EAMCET (Engg.) 2003]
A)
\[\sqrt{2}\] done
clear
B)
\[\frac{1}{\sqrt{2}}\] done
clear
C)
\[\sqrt{2}-1\] done
clear
D)
\[\frac{1}{\sqrt{2}-1}\] done
clear
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question_answer11)
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 [AIEEE 2002]
A)
10 done
clear
B)
20 done
clear
C)
25.5 done
clear
D)
5 done
clear
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question_answer12)
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 [CPMT 2002]
A)
\[\sqrt{400}\,m/s\] done
clear
B)
\[\sqrt{600\,}\,m/s\] done
clear
C)
\[\sqrt{60}\,m/s\] done
clear
D)
None of these done
clear
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question_answer13)
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 [MP PMT 1997]
A)
t done
clear
B)
4t done
clear
C)
2 t done
clear
D)
t/4 done
clear
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question_answer14)
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 done
clear
B)
5 cm done
clear
C)
10 cm done
clear
D)
0.25 cm done
clear
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question_answer15)
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 [EAMCET (Med.) 2003]
A)
0.1 done
clear
B)
0.05 done
clear
C)
0.005 done
clear
D)
0.0005 done
clear
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question_answer16)
Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'h' with a velocity 'v'. The retarding viscous force acting on the spherical ball is [AIEEE 2004]
A)
Inversely proportional to 'r' but directly proportional to velocity 'v' done
clear
B)
Directly proportional to both radius 'r' and velocity 'v' done
clear
C)
Inversely proportional to both radius 'r' and velocity 'v' done
clear
D)
Directly proportional to 'r' but inversely proportional to 'v' done
clear
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question_answer17)
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 [MP PMT 1990]
A)
Greater than the work done by air friction in the second 100 m done
clear
B)
Less than the work done by air friction in the second 100 m done
clear
C)
Equal to 100 mg done
clear
D)
Greater than 100 mg done
clear
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question_answer18)
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 [MP PMT 1990]
A)
10 cm per sec done
clear
B)
2.5 cm per sec done
clear
C)
\[5\times {{(4)}^{1/3}}cm\] per sec done
clear
D)
\[5\times \sqrt{2}\,cm\] per sec done
clear
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question_answer19)
A ball of radius r and density r 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 h, the value of h is given by
A)
\[\frac{2}{9}{{r}^{2}}\left( \frac{1-\rho }{\eta } \right)\,g\] done
clear
B)
\[\frac{2}{81}{{r}^{2}}\left( \frac{\rho -1}{\eta } \right)\,g\] done
clear
C)
\[\frac{2}{81}{{r}^{4}}{{\left( \frac{\rho -1}{\eta } \right)}^{2}}g\] done
clear
D)
\[\frac{2}{9}{{r}^{4}}{{\left( \frac{\rho -1}{\eta } \right)}^{2}}g\] done
clear
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question_answer20)
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) [EAMCET (Engg.) 2003]
A)
\[\frac{V}{16}\] done
clear
B)
\[\frac{V}{17}\] done
clear
C)
\[\frac{16V}{17}\] done
clear
D)
\[\frac{17V}{16}\] done
clear
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question_answer21)
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 [EAMCET 2001]
A)
P done
clear
B)
\[\frac{3P}{4}\] done
clear
C)
\[\frac{P}{2}\] done
clear
D)
\[\frac{P}{4}\] done
clear
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question_answer22)
We have two (narrow) capillary tubes T1 and T2. Their lengths are l1 and l2 and radii of cross-section are r1 and r2 respectively. The rate of flow of water under a pressure difference P through tube T1 is 8cm3/sec. If l1 = 2l2 and r1 =r2, what will be the rate of flow when the two tubes are connected in series and pressure difference across the combination is same as before (= P)
A)
4 cm3/sec done
clear
B)
(16/3) cm3/sec done
clear
C)
(8/17) cm3/sec done
clear
D)
None of these done
clear
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question_answer23)
In a laminar flow the velocity of the liquid in contact with the walls of the tube is
A)
Zero done
clear
B)
Maximum done
clear
C)
In between zero and maximum done
clear
D)
Equal to critical velocity done
clear
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question_answer24)
In a turbulent flow, the velocity of the liquid molecules in contact with the walls of the tube is
A)
Zero done
clear
B)
Maximum done
clear
C)
Equal to critical velocity done
clear
D)
May have any value done
clear
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question_answer25)
The Reynolds number of a flow is the ratio of
A)
Gravity to viscous force done
clear
B)
Gravity force to pressure force done
clear
C)
Inertia forces to viscous force done
clear
D)
Viscous forces to pressure forces done
clear
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question_answer26)
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 [RPMT 2001]
A)
4 : 9 done
clear
B)
9 : 4 done
clear
C)
8 : 27 done
clear
D)
1 : 1 done
clear
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question_answer27)
Water is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have [MP PMT 1992]
A)
Maximum speed and least pressure done
clear
B)
Maximum pressure and least speed done
clear
C)
Both pressure and speed maximum done
clear
D)
Both pressure and speed least done
clear
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question_answer28)
A liquid flows in a tube from left to right as shown in figure. \[{{A}_{1}}\] and \[{{A}_{2}}\] are the cross-sections of the portions of the tube as shown. Then the ratio of speeds \[{{v}_{1}}/{{v}_{2}}\] will be
A)
\[{{A}_{1}}/{{A}_{2}}\] done
clear
B)
\[{{A}_{2}}/{{A}_{1}}\] done
clear
C)
\[\sqrt{{{A}_{2}}}/\sqrt{{{A}_{1}}}\] done
clear
D)
\[\sqrt{{{A}_{1}}}/\sqrt{{{A}_{2}}}\] done
clear
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question_answer29)
In a streamline flow
A)
The speed of a particle always remains same done
clear
B)
The velocity of a particle always remains same done
clear
C)
The kinetic energies of all the particles arriving at a given point are the same done
clear
D)
The moments of all the particles arriving at a given point are the same done
clear
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question_answer30)
An application of Bernoulli's equation for fluid flow is found in [IIT-JEE (Screening) 1994]
A)
Dynamic lift of an aeroplane done
clear
B)
Viscosity meter done
clear
C)
Capillary rise done
clear
D)
Hydraulic press done
clear
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question_answer31)
The Working of an atomizer depends upon [MP PMT 1992; AFMC 2005]
A)
Bernoulli's theorem done
clear
B)
Boyle's law done
clear
C)
Archimedes principle done
clear
D)
Newton's law of motion done
clear
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question_answer32)
The pans of a physical balance are in equilibrium. Air is blown under the right hand pan; then the right hand pan will
A)
Move up done
clear
B)
Move down done
clear
C)
Move erratically done
clear
D)
Remain at the same level done
clear
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question_answer33)
According to Bernoulli's equation \[\frac{P}{\rho g}+h+\frac{1}{2}\,\frac{{{v}^{2}}}{g}=\text{constant}\] The terms A, B and C are generally called respectively:
A)
Gravitational head, pressure head and velocity head done
clear
B)
Gravity, gravitational head and velocity head done
clear
C)
Pressure head, gravitational head and velocity head done
clear
D)
Gravity, pressure and velocity head done
clear
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question_answer34)
At what speed the velocity head of a stream of water be equal to 40 cm of Hg
A)
282.8 cm/sec done
clear
B)
432.6 cm/sec done
clear
C)
632.6 cm/sec done
clear
D)
832.6 cm/sec done
clear
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question_answer35)
The weight of an aeroplane flying in air is balanced by
A)
Upthrust of the air which will be equal to the weight of the air having the same volume as the plane done
clear
B)
Force due to the pressure difference between the upper and lower surfaces of the wings, created by different air speeds on the surface done
clear
C)
Vertical component of the thrust created by air currents striking the lower surface of the wings done
clear
D)
Force due to the reaction of gases ejected by the revolving propeller done
clear
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question_answer36)
In this figure, an ideal liquid flows through the tube, which is of uniform cross-section. The liquid has velocities\[{{v}_{A}}\] and \[{{v}_{B}}\], and pressure PA and PB at points A and B respectively
A)
\[{{v}_{A}}={{v}_{B}}\] done
clear
B)
\[{{v}_{B}}>{{v}_{A}}\] done
clear
C)
PA = PB done
clear
D)
PB > PA done
clear
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question_answer37)
A liquid flows through a horizontal tube. The velocities of the liquid in the two sections, which have areas of cross-section \[{{A}_{1}}\] and \[{{A}_{2}}\], are \[{{v}_{1}}\] and \[{{v}_{2}}\] respectively. The difference in the levels of the liquid in the two vertical tubes is h
A)
The volume of the liquid flowing through the tube in unit time is \[{{A}_{1}}{{v}_{1}}\] done
clear
B)
\[{{v}_{2}}-{{v}_{1}}=\sqrt{2gh}\] done
clear
C)
\[v_{2}^{2}-v_{1}^{2}=2gh\] done
clear
D)
The energy per unit mass of the liquid is the same in both sections of the tube done
clear
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question_answer38)
A sniper fires a rifle bullet into a gasoline tank making a hole 53.0 m below the surface of gasoline. The tank was sealed at 3.10 atm. The stored gasoline has a density of 660 kgm?3. The velocity with which gasoline begins to shoot out of the hole is
A)
\[27.8\,m{{s}^{-1}}\] done
clear
B)
\[41.0\,m{{s}^{-1}}\] done
clear
C)
\[9.6\,m{{s}^{-1}}\] done
clear
D)
\[19.7\,m{{s}^{-1}}\] done
clear
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question_answer39)
An L-shaped tube with a small orifice is held in a water stream as shown in fig. The upper end of the tube is 10.6 cm above the surface of water. What will be the height of the jet of water coming from the orifice? Velocity of water stream is 2.45 m/s
A)
Zero done
clear
B)
20.0 cm done
clear
C)
10.6 cm done
clear
D)
40.0 cm done
clear
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question_answer40)
Fig. represents vertical sections of four wings moving horizontally in air. In which case the force is upwards
A)
B)
C)
D)
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question_answer41)
An L-shaped glass tube is just immersed in flowing water such that its opening is pointing against flowing water. If the speed of water current is v, then
A)
The water in the tube rises to height \[\frac{{{v}^{2}}}{2g}\] done
clear
B)
The water in the tube rises to height \[\frac{g}{2{{v}^{2}}}\] done
clear
C)
The water in the tube does not rise at all done
clear
D)
None of these done
clear
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question_answer42)
A tank is filled with water up to a height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water. Express the horizontal distance x in terms of H and D [MNR 1992; CPMT 2004]
A)
\[x=\sqrt{D(H-D)}\] done
clear
B)
\[x=\sqrt{\frac{D(H-D)}{2}}\] done
clear
C)
\[x=2\sqrt{D(H-D)}\] done
clear
D)
\[x=4\sqrt{D(H-D)}\] done
clear
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question_answer43)
A cylindrical vessel of 90 cm height is kept filled upto the brim. It has four holes 1, 2, 3, 4 which are respectively at heights of 20 cm, 30 cm, 45 cm and 50 cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from [CPMT 1989]
A)
Hole number 4 done
clear
B)
Hole number 3 done
clear
C)
Hole number 2 done
clear
D)
Hole number 1 done
clear
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question_answer44)
A rectangular vessel when full of water takes 10 minutes to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water
A)
9 minute done
clear
B)
7 minute done
clear
C)
5 minute done
clear
D)
3 minute done
clear
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question_answer45)
A streamlined body falls through air from a height h on the surface of a liquid. If d and D(D > d) represents the densities of the material of the body and liquid respectively, then the time after which the body will be instantaneously at rest, is
A)
\[\sqrt{\frac{2h}{g}}\] done
clear
B)
\[\sqrt{\frac{2h}{g}\,.\,\frac{D}{d}}\] done
clear
C)
\[\sqrt{\frac{2h}{g}\,.\,\frac{d}{D}}\] done
clear
D)
\[\sqrt{\frac{2h}{g}}\,\left( \frac{d}{D-d} \right)\] done
clear
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question_answer46)
A large tank is filled with water to a height H. A small hole is made at the base of the tank. It takes \[{{T}_{1}}\] time to decrease the height of water to \[\frac{H}{\eta }\,(\eta >1)\]; and it takes \[{{T}_{2}}\] time to take out the rest of water. If \[{{T}_{1}}={{T}_{2}}\], then the value of \[\eta \] is
A)
2 done
clear
B)
3 done
clear
C)
4 done
clear
D)
\[2\sqrt{2}\] done
clear
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question_answer47)
Velocity of water in a river is [CBSE PMT 1988]
A)
Same everywhere done
clear
B)
More in the middle and less near its banks done
clear
C)
Less in the middle and more near its banks done
clear
D)
Increase from one bank to other bank done
clear
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question_answer48)
As the temperature of water increases, its viscosity
A)
Remains unchanged done
clear
B)
Decreases done
clear
C)
Increases done
clear
D)
Increases or decreases depending on the external pressure done
clear
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question_answer49)
The coefficient of viscosity for hot air is
A)
Greater than the coefficient of viscosity for cold air done
clear
B)
Smaller than the coefficient of viscosity for cold air done
clear
C)
Same as the coefficient of viscosity for cold air done
clear
D)
Increases or decreases depending on the external pressure done
clear
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question_answer50)
A good lubricant should have
A)
High viscosity done
clear
B)
Low viscosity done
clear
C)
Moderate viscosity done
clear
D)
High density done
clear
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question_answer51)
We have three beakers A, B and C containing glycerine, water and kerosene respectively. They are stirred vigorously and placed on a table. The liquid which comes to rest at the earliest is
A)
Glycerine done
clear
B)
Water done
clear
C)
Kerosene done
clear
D)
All of them at the same time done
clear
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question_answer52)
A small drop of water falls from rest through a large height h in air; the final velocity is
A)
\[\propto \,\sqrt{h}\] done
clear
B)
\[\propto \,h\] done
clear
C)
\[\propto \,(1/h)\] done
clear
D)
Almost independent of h done
clear
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question_answer53)
The rate of flow of liquid in a tube of radius r, length l, whose ends are maintained at a pressure difference P is \[V=\frac{\pi QP\,{{r}^{4}}}{\eta l}\] where \[\eta \] is coefficient of the viscosity and Q is [DCE 2002]
A)
8 done
clear
B)
\[\frac{1}{8}\] done
clear
C)
16 done
clear
D)
\[\frac{1}{16}\] done
clear
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question_answer54)
In Poiseuilli's method of determination of coefficient of viscosity, the physical quantity that requires greater accuracy in measurement is [EAMCET 2001]
A)
Pressure difference done
clear
B)
Volume of the liquid collected done
clear
C)
Length of the capillary tube done
clear
D)
Inner radius of the capillary tube done
clear
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question_answer55)
Two capillary tubes of the same length but different radii r1 and r2 are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the radius of a single tube that can replace the two tubes so that the rate of flow is same as before
A)
\[{{r}_{1}}+{{r}_{2}}\] done
clear
B)
\[r_{1}^{2}+r_{2}^{2}\] done
clear
C)
\[r_{1}^{4}+r_{2}^{4}\] done
clear
D)
None of these done
clear
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question_answer56)
Two capillaries of same length and radii in the ratio 1 : 2 are connected in series. A liquid flows through them in streamlined condition. If the pressure across the two extreme ends of the combination is 1 m of water, the pressure difference across first capillary is
A)
9.4 m done
clear
B)
4.9 m done
clear
C)
0.49 m done
clear
D)
0.94 m done
clear
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question_answer57)
Water flows in a streamlined manner through a capillary tube of radius a, the pressure difference being P and the rate of flow Q. If the radius is reduced to a/2 and the pressure increased to 2P, the rate of flow becomes
A)
\[4Q\] done
clear
B)
Q done
clear
C)
\[\frac{Q}{4}\] done
clear
D)
\[\frac{Q}{8}\] done
clear
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question_answer58)
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram [BCECE 2005]
A)
B)
C)
D)
None of these done
clear
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question_answer59)
Water is flowing in a pipe of diameter 4 cm with a velocity 3 m/s. The water then enters into a tube of diameter 2 cm. The velocity of water in the other pipe is [BCECE 2005]
A)
3 m/s done
clear
B)
6 m/s done
clear
C)
12 m/s done
clear
D)
8 m/s done
clear
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question_answer60)
Two capillary of length L and 2L and of radius R and 2R are connected in series. The net rate of flow of fluid through them will be (given rate of the flow through single capillary, \[X=\pi P{{R}^{4}}/8\eta L)\] [DCE 2005]
A)
\[\frac{8}{9}X\] done
clear
B)
\[\frac{9}{8}X\] done
clear
C)
\[\frac{5}{7}X\] done
clear
D)
\[\frac{7}{5}X\] done
clear
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question_answer61)
When a body falls in air, the resistance of air depends to a great extent on the shape of the body, 3 different shapes are given. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same). [KCET 2005]
A)
1 < 2 < 3 done
clear
B)
2 < 3 < 1 done
clear
C)
3 < 2 < 1 done
clear
D)
3 < 1 < 2 done
clear
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question_answer62)
Water falls from a tap, down the streamline [Orissa JEE 2005]
A)
Area decreases done
clear
B)
Area increases done
clear
C)
Velocity remains same done
clear
D)
Area remains same done
clear
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question_answer63)
A manometer connected to a closed tap reads \[4.5\times {{10}^{5}}\] pascal. When the tap is opened the reading of the manometer falls to \[4\times {{10}^{5}}\] pascal. Then the velocity of flow of water is [Kerla PET 2005]
A)
7 \[m{{s}^{-1}}\] done
clear
B)
8 \[m{{s}^{-1}}\] done
clear
C)
9 \[m{{s}^{-1}}\] done
clear
D)
10 \[m{{s}^{-1}}\] done
clear
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question_answer64)
What is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body ? (The densities of metal and of liquid are r and s respectively, and the viscosity of the liquid is h). [Kerala PET 2005]
A)
\[\frac{{{r}^{2}}g}{9\eta }(\rho -2\sigma )\] done
clear
B)
\[\frac{{{r}^{2}}g}{9\eta }(2\rho -\sigma )\] done
clear
C)
\[\frac{{{r}^{2}}g}{9\eta }(\rho -\sigma )\] done
clear
D)
\[\frac{2{{r}^{2}}g}{9\eta }(\rho -\sigma )\] done
clear
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question_answer65)
Consider the following equation of Bernouilli?s theorem. \[P+\frac{1}{2}\rho {{V}^{2}}+\rho gh=K\](constant) The dimensions of K/P are same as that of which of the following [AFMC 2005]
A)
Thrust done
clear
B)
Pressure done
clear
C)
Angle done
clear
D)
Viscosity done
clear
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question_answer66)
An incompressible fluid flows steadily through a cylindrical pipe which has radius 2r at point A and radius r at B further along the flow direction. If the velocity at point A is v, its velocity at point B is [Kerala PMT 2005]
A)
2v done
clear
B)
v done
clear
C)
v/2 done
clear
D)
4v done
clear
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