JEE Questions for Physics Mechanical Properties Of Fluids Quiz 12 - MCQExams.com

In which one of the following cases will the liquid flow in a pipe he most streamlined?
  • Liquid of high viscosity and high density flowing through a pipe of small radius
  • Liquid of high viscosity and low density flowing through a pipe of small radius
  • Liquid of low viscosity and low density flowing through a pipe of large radius
  • Liquid of low viscosity and high density flowing through a pipe of large radius
An incompressible liquid flows through a horizontal tube as shown in the following fig. Then, the velocity v of the fluid is
Physics-Mechanical Properties of Fluids-79122.png
  • 3.0 m/s
  • 1.5 m/s
  • 1.0 m/s
  • 2.25 m/s
Horizontal tube of non-uniform cross-section has radii of 0.1 m and 0.05 m respectively at M and N for a streamline flow of liquid the rate of liquid flow is
Physics-Mechanical Properties of Fluids-79124.png
  • Continuously changes with time
  • Greater at M than at N
  • Greater at N than at M
  • Same at M and N
A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following
  • The speed is high at the wider end and high at the narrow end
  • The speed is low at the wider end and high at the narrow end
  • The speed is same at both ends in a stream line flow
  • The liquid flows with uniform velocity in the tube.
The height of the dam, in an hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water (in kg) that must fall per second on the blades of the turbine is
  • 106
  • 105
  • 103
  • 104
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
Physics-Mechanical Properties of Fluids-79128.png
  • Height of the liquid in the tube A is maximum
  • Height of the liquid in the tubes A and B is the same
  • height of the liquid ¡n all the three tubes is the same
  • Height of the liquid in the tubes A and C is the same
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
  • 2.5 cm
  • 5 cm
  • 10 cm
  • 0.25 cm
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
  • 10 cm per sec
  • 2.5 cm per sec
  • 5 × (4)1/3 cm per sec
  • 5 × √2 cm per sec
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
Physics-Mechanical Properties of Fluids-79132.png

  • Physics-Mechanical Properties of Fluids-79133.png
  • 2)
    Physics-Mechanical Properties of Fluids-79134.png

  • Physics-Mechanical Properties of Fluids-79135.png

  • Physics-Mechanical Properties of Fluids-79136.png
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)

  • Physics-Mechanical Properties of Fluids-79138.png
  • 2)
    Physics-Mechanical Properties of Fluids-79139.png

  • Physics-Mechanical Properties of Fluids-79140.png

  • Physics-Mechanical Properties of Fluids-79141.png
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
  • P
  • 2)
    Physics-Mechanical Properties of Fluids-79143.png

  • Physics-Mechanical Properties of Fluids-79144.png

  • Physics-Mechanical Properties of Fluids-79145.png
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 8 cm3/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)
  • 4 cm3/sec
  • (16/3)cm3/sec
  • (8/17)cm3/sec
  • None of these
A small spherical ball falling through a viscous medium of negligible density has terminal velocity v. Another ball of the same mass but of radius twice that of the earlier falling through the same viscous medium will have terminal velocity
  • v
  • v/4
  • v/2
  • 2v
  • v/8
The water flows from a tap of diameter 1.25 cm with a rate of 5 × 10-5 m3 s-1. The density and coefficient of viscosity of water are 103 kg m-3 and 10-3 P as, respectively. The flow of water is
  • Steady with Reynolds number 5100
  • Turbulent with Reynolds number 5100
  • Steady with Reynolds number 3900
  • Turbulent with Reynolds number 3900
Water is flowing through a horizontal pipe of non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have
  • Maximum speed and least pressure
  • Maximum pressure and least speed
  • Both pressure and speed maximum
  • Both pressure and speed least
A liquid flows in a tube from left to right as shown in figure. A1 and A2 are the cross-sections of the portions of the tube as shown. Then, the ratio of speeds v1/v2 will be
Physics-Mechanical Properties of Fluids-79150.png
  • A1 / A2
  • A2 / A1

  • Physics-Mechanical Properties of Fluids-79151.png

  • Physics-Mechanical Properties of Fluids-79152.png
The cylindrical tube of a spray pump has a cross-section of 8 cm2, one end of which has 40 fine holes each of area 10-8m2. If the liquid flows inside the tube with a speed of 0.15 m min-1, the speed with which the liquid is ejected through the holes is
  • 50 ms-1
  • 5 ms-1
  • 0.05 ms-1
  • 0.5 ms-1
In this figure, an ideal liquid flows through the tube, which is of uniform cross-section. The liquid has speed vA and vB and pressure PA and PB at points A and B respectivley
Physics-Mechanical Properties of Fluids-79154.png
  • vA = vB
  • vB > vA
  • PA = PB
  • PB > PA
  • Both (and (4)
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 kg m–3. The velocity with which gasoline begins to shoot out. of the hole is
  • 27.8 ms–1
  • 41.0 ms–1
  • 9.6 ms–1
  • 19.7 ms–1
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
Physics-Mechanical Properties of Fluids-79157.png
  • Zero
  • 20.0 cm
  • 10.6 cm
  • 40.0 cm
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 y, then
Physics-Mechanical Properties of Fluids-79159.png
  • The water in the tube rises to height
    Physics-Mechanical Properties of Fluids-79160.png
  • The water in the tube rises to height
    Physics-Mechanical Properties of Fluids-79161.png
  • The water in the tube does not rises to all
  • None of the above
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
Physics-Mechanical Properties of Fluids-79162.png
  • Hole number 4
  • Hole number 3
  • Hole number 2
  • Hole number 1
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

  • Physics-Mechanical Properties of Fluids-79164.png
  • 2)
    Physics-Mechanical Properties of Fluids-79165.png

  • Physics-Mechanical Properties of Fluids-79166.png

  • Physics-Mechanical Properties of Fluids-79167.png

Physics-Mechanical Properties of Fluids-79169.png
  • 2
  • 3
  • 4
  • 2√2
Velocity of water in a river is
  • Same everywhere
  • More in the middle and less near its banks
  • Less in the middle and more near its banks
  • Increase from one bank to other bank
Two rain drops of same radii ‘r’ falling with terminal velocity ‘v’ merge and form a bigger drop of radius R. The terminal velocity of the bigger drop is

  • Physics-Mechanical Properties of Fluids-79171.png
  • 2)
    Physics-Mechanical Properties of Fluids-79172.png
  • v
  • 2v
Water flows steadily through a horizontal pipe of variable cross-section. If the pressure of water is P at a point where flow speed is y, the pressure at another point where the flow speed is 2v, is (Take density of water as p)

  • Physics-Mechanical Properties of Fluids-79174.png
  • 2)
    Physics-Mechanical Properties of Fluids-79175.png

  • Physics-Mechanical Properties of Fluids-79176.png

  • Physics-Mechanical Properties of Fluids-79177.png

Physics-Mechanical Properties of Fluids-79179.png
  • 8
  • 2)
    Physics-Mechanical Properties of Fluids-79180.png
  • 16

  • Physics-Mechanical Properties of Fluids-79181.png
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
  • 9.4 m
  • 4.9 m
  • 0.49 m
  • 0.94 m
Water flows in a streamlined manner through a capillary tube of radius a, the pressure difference being P and the rate of flow Q. 1f the radius is reduced to a/2 and the pressure increased to 2P, the rate of flow becomes
  • 4Q
  • Q

  • Physics-Mechanical Properties of Fluids-79183.png

  • Physics-Mechanical Properties of Fluids-79184.png
A viscous fluid is flowing through a cylindrical tube. The velocity distribution of the fluid is best represented by the diagram

  • Physics-Mechanical Properties of Fluids-79185.png
  • 2)
    Physics-Mechanical Properties of Fluids-79186.png

  • Physics-Mechanical Properties of Fluids-79187.png
  • None of these
Two capillary of length L and 2L and of radius R and 2R arc connected in series. The net rate of flow of fluid through them will be (given rate of the flow through single capillary, X = πPR4 / 8ηL)

  • Physics-Mechanical Properties of Fluids-79188.png
  • 2)
    Physics-Mechanical Properties of Fluids-79189.png

  • Physics-Mechanical Properties of Fluids-79190.png

  • Physics-Mechanical Properties of Fluids-79191.png
A manometer connected to a closed tap reads 4.5 × 105 pascal. When the tap is opened the reading of the manometer falls to 4 × 105 pascal. Then, the velocity of flow of water is
  • 7 ms-1
  • 8 ms-1
  • 9 ms-1
  • 10 ms-1
What is the velocity y 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 ρ and σ respectively and the viscosity of the liquid is η).

  • Physics-Mechanical Properties of Fluids-79194.png
  • 2)
    Physics-Mechanical Properties of Fluids-79195.png

  • Physics-Mechanical Properties of Fluids-79196.png

  • Physics-Mechanical Properties of Fluids-79197.png
The weight of an aeroplane flying in the air is balanced by
  • Vertical component of the thrust created by air currents striking the lower surface of the wings
  • Force due to reaction of gases ejected by the revolving propeller
  • Upthrust of the air which will be equal to the weight of the air having the same volume as the plane
  • Force due to the pressure difference between the upper and lower surfaces of the wings created by different air speeds on the surfaces
If the terminal speed of a sphere of gold (density = 19.5 kg/m3) is 0.2m/s in a viscous liquid (density = 1.5 kg/m3), find the terminal speed of a sphere of silver (density = 10.5 kg/m3) of the same size in the same liquid
  • 0.133 m/s
  • 0.1 m/s
  • 0.2 m/s
  • 0.4 m/s
Two helium filled balloons are floating next to each other at the ends of strings tied to a table. The facing surfaces of the balloons are separated by 1 to 2 cm. If you blow through the opening between the balloons, then
  • They move away from each other
  • They move towards each other
  • They are unaffected
  • Nothing can be said about their separation
Two metal spheres are falling through a liquid of density 2 × 103 kg/m3 with the same uniform speed. The material density of sphere 1 and sphere 2 are 8 × 103kg/ m3 and 11 × 103 kg/m3 respectively. The ratio of their radii is

  • Physics-Mechanical Properties of Fluids-79199.png
  • 2)
    Physics-Mechanical Properties of Fluids-79200.png

  • Physics-Mechanical Properties of Fluids-79201.png

  • Physics-Mechanical Properties of Fluids-79202.png
Water is in streamline flow along a horizontal pipe with nonuniform cross-section. At a point in the pipe where the area of cross-section is 10 cm2, the velocity of water is 1 ms-1 and the pressure is 2000 Pa. The pressure at another point where the cross-sectional area is 5 cm2 is
  • 4000 Pa
  • 2000 Pa
  • 1000 Pa
  • 500 Pa
A container of height 10 m which is open at the top, has water to its full height. Two small openings are made on the walls of the container one exactly at the middle and the other at the bottom. The ratio of the velocities with which water comes out from the middle and the bottom region respectively is
  • 2
  • 2)
    Physics-Mechanical Properties of Fluids-79205.png

  • Physics-Mechanical Properties of Fluids-79206.png

  • Physics-Mechanical Properties of Fluids-79207.png
Bernoulli’s principle is not involved in the working/explanation of
  • Movement of spinning ball
  • Carburetor of automobile
  • Blades of a kitchen mixer
  • Heart attack
  • Dynamic lift of an aeroplane
Water is flowing continuously from a tap having an internal diameter 8 × 10–3 m. The water velocity as it leaves the tap is 0.4 ms–1 . The diameter of the water stream at a distance 2 × 10–1 m below the tap is close to
  • 5.0 × 10–3 m
  • 7.5 × 10–3 m
  • 9.6 × 10–3 m
  • 3.6 × 10–3 m
Assertion Pascal\'s law is the working principle of a hydraulic lift.
Reason Pressure is equal to thrust per unit area.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The blood pressure in humans is greater at the feet than at the brain.
Reason Pressure of liquid at any point is proportional to height , density of liquid and acceleration due to gravity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion Hydrostatic pressure is a vector quantity.
ReasonPresure is force divided by area, and force is a vector quantity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion To empty an oil tank, two holes are made
Reason Oil will come out of two holes, so it will be emptied faster.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion A man sitting in a boat which is floating on a pond. If man drinks some water from the pond, the level of the water in the pond decreases.
Reason According to Archimede\'s principle the weight displaced by body is equal to the weight of the body.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion A piece of ice floats in water, the level of water remains unchanged when the ice melts completely.
Reason According to Archimede\'s principle , the loss in weight of the body in the liquid is equal to the weight of the liquid displaced by the immersed part of the body.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The velocity increases, when water flowing in broader enter a narrow pipe.
Reason According to equation of continuity, product of area and velocity is constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
Assertion The velocity of flow of a liquid is smaller when pressure is larger and viceversa.
Reason According to Bernoulli\'s theorem, for the stream line flow of an ideal liquid , the total energy per unit mass remains constant.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false.
  • If the Assertion and Reason both are false.
  • If Assertion is false but Reason is true.
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