Fluids Questions and Answers

7 2 A cubical block of copper of side 10 cm is floating in a vessel containing mercury Water is poured into the vessel so that the copper block just gets submerged The height of water column is PHg 13 6 g cc Pcu 7 3 g cc Pwater 1 gm cc A 1 25 cm B 2 5 cm D 7 5 cm 9 5 cm

5 kg 3 A body of density p is dropped from rest at a height h into a lake of density where a p Neglecting all dissipative forces calculate the maximum depth to which the body sinks before returning to float on the surface h 1 3 hp a p 4 hp O ho O P P for your for affid p ag fe es fer 1 3 h a p hp a p 2 4 G ho o p

A weightless gate having cross section of a quarter cylinder radius R and length I is pivoted at point O at the bottom and is in stati equilibrium when subjected to two different fluids of density p and p P as shown in the figure The value of is P P1 P2

20 The velocity of a small ball of mass M and density d when dropped in a container filled with glycerine becomes constant after some time If the density o d glycerine is then the viscous force acting on the 2 ball will be 1 Mg 3 2Mg 2 4 3 2 Mg Mg

2 pts A major artery with a cross sectional area of 0 910 cm2 branches into 19 smaller arteries each with an average cross sectional area of 0 400 cm If the velocity of the blood in the major artery is 53 0 cm s what is the average velocity of the blood in the smaller arteries

Q15 A cubical block of steel of each side equal to 1 is floating on mercury in vessel The densities of steel and mercury are ps and pm The height of the block above the Pm mercury level is given by a 1 1 2 b 1 1 P Pm c 1 Pm d 1 1 Pm

60 A simple pendulum has a time period T in vacuum liquid of density one eight of the density of material Its time period when it is completely immersed in a of the bob is 7 a c 3 8 T 9 T are correct 5 b T V8 d 8 7 T

A U tube with limbs of diameters 5mm and 2mm contains water of surface tension 7x10 N m angle of contact is zero and density 10 kg m The difference in the level in the two limbs is g 10 m s 7 7 mm 6 8 mm 9 5 mm 8 4 mm

View In English 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 the becomes 1 2 3 4 Correct Answer 4 Status unattempted 40 0400

Q29 A large tank is filled with water density 10 kg m A small hole is made at a depth 10 m below water surface The range of water effluxing out of the hole is R on ground The extra pressure in atm must be applied on the water surface so that the range becomes 2R is Take 1 atm 105 Pa and g 10 m s 10m

Q23 Fountains usually seen in gardens are generated by a wide pipe with an enclosure at one end having many small holes Consider one such fountain which is produced by a pipe of internal diameter 2 cm in which water flows at a rate 3 ms 1 The enclosure has 100 holes each of diameter 0 05 cm The velocity of water coming out of the holes is in ms a 0 48 b 96 c 24 d 48

Q22 A cubical block of wood of specific gravity 0 5 and chunk of concrete of specific gravity 2 5 are fastened together The ratio of the mass of wood to the mass of concrete which makes the combination to float with its entire volume submerged under water is a 1 5 b 1 3 c 3 5 d 2 3

Q19 A solid of density D is floating in a liquid of density d If v is the volume of solid submerged in the liquid and V is the total volume of the solid then v V equal to a b c d d D D D d D d

O A ring of radius R is kept on water surface Surface tension of water is T and mass is m What force is required to lift the ring from water surface a mg TR c mg 2 TR b mg R d mg 4nTR AIMS

A cubical block of side 0 5 m floats on water with 30 of its volume under water What is the maximum weight that can be put on the block without fully submerging it under water Take density of water 10 kg m b 30 1 kg d 65 4 kg a 46 3 kg c 87 5 kg JEE Main

When an air bubble of radius r rises from the bottom to the surface of a lake its radius becomes 5r Taking the atmospheric pressure to be equal 4 to 10 m height of water column the depth of the lake would approximately be ignore the surface tension and the effect of temperature a 11 2 m b 10 5 m c 9 5 m d 8 7 m JEF Main

No 6 View In English A cylinder containing an ideal gas is in vertical position and has a piston of mass M that is able to move up or down without friction If the temperature of gas is increased thon M 1 3 4 Correct Answer 3 Your Answor 1 Stoh incorrent both prossure and volume of gas will chango Only pressure will increase according to charlo s law Volume will change but not prossuro Prossure will change but not volumo

Water from a tap emerges vertically downwards with an initial speed of 1 0 ms The cross sectional area of the tap is 10 m The cross sectional area of the stream 0 15 m below the tap 1 5 0 10 m 2 1 0 105 m 3 5 0 x 10 m 4 2 0 105 m

The work done in increasing the size of a rectangular soap film with dimensions 8 cm x 3 75 cm to 10 cm x 6 cm is 2 x 10 J The surface tension of the film in N m is 1 1 65 x 10 2 3 3 107 3 6 6 107 4 8 25 x 10

Three liquids have same surface tension and densities 0 02 and 03 0 02 03 In three identical capillaries rise of liquid is same The corresponding angles of ontact 0 02 and 83 are related as 1 0 0 03 0 03 0 0 0 03 0 0 0

Wax is coated on the inner wall of a capillary tube and the tube is then dipped in water Then compared to the unwaxed capillary the angle of contact and the height h upto which rises changes These changes are 2013 1 0 increases and h also increases e increases and h decreases 2 0 decreases and h also decreases 4 0 decreases and h increases

A large tank is filled with water density 10 kg m A small hole is made at a depth 10m below water surface The range of water issuing out of the hole is R on ground What extra pressure must be applied on the water surface so that the range becomes 2R take 1 atm 105 Pa and g 10 m s add your responses Om Asked by 3471507 aesl id Standard XII Stream NEET Jul 26 2021 9 55 P Type Text R Type your answer here OR you can upload an attachment from the option below

The radius of a soap bubble is r and surface tension of the soap solution is S The electric potential to which the soap bubble be raised by charging it so that the pressure inside the bubble becomes equal to the pressure outside the bubble is permittivity of the free space Sr Sr c a 1 As b 4Sr E d 8Sr o

A large tank is filled with water density P upto height h Water is coming out from section 4 Fluid pressure at section 3 at the instant shown is Given Area A2 A4 2A3 and A2 A3 and A are very small as compared to A atmospheric pressure Po Assume water to be non viscous and incompressible h O Po pgh Po pgh 3 I

This section contains 35 SINGLE CORRECT TYPE Read More The temperature of water is increased from 0 C to 20 C by heating it The volume of the water O Increases continuously Decreases continuously O First increases then decreases O First decreases then increases

There is a circular tube in a vertical plane Two liquids which do not mix and of densities d and d are filled in the tube Each liquid subtends 90 angle at centre Radius joining their interface makes an angle a with vertical ratio d d is 1 tana 1 1 tana 1 sina 1 sina 3 2 4 1 sina 1 cosa 1 cos a 1 cos a

Q 20 A drop of water and a soap bubble have the same radii Surface tension of soap solution is half of that of water The ratio of excess pressure inside the drop and bubble is 1 1 2 2 2 1 4 1 1 3 1 4

A target object is placed at the bottom of a tank of depth 20 m and filled with a liquid of density 500 gm cc Another object of density 100 gm cc is dropped onto it from a height of 45 m from the upper surface of the liquid take g 10 m s C A The second object will collide with the target B The second object does not collide with the target C The least separation between object and target is 11 25 m D The retardation of the object in the liquid is 40 ms 45m

Q1 Two vessels A and B have the same base area and contain water to the same height but the mass of water in A is four times that in B The ratio of the liquid thrust at the base of A to that at the base of B is X A a 4 1 b 2 1 c 1 1 d 16 1 T B

Q2 A liquid of mass 1 kg is filled in a flask as shown in figure The force exerted by the flask on the liquid is g 10 m s2 Neglect atmospheric pressure AANANA MADARA a 10 N b greater than 10N c less than 10N d zero

A wooden ball of mass m density o is kept inside water density p a by the help of a massless string shown in the figure One end of the string is fixed at the bottom of vessel When the vessel containing the water is accelerated apwards with acceleration a as shown in the figure A tension in the string will increase Cforce of buoyancy will increase B tension in the string will decrease D force of buoyancy will decrease

The opening near the bottom of the vessel shown in figure has an area A A piston is held against the opening to keep the liquid from running out Let F be the net force on the piston applied by liquid and air in this case Now the piston is moved away from the opening by a short distance The liquid comes out and strikes the piston inelastically Let F2 be the force exerted by liquid and air in this condition Then B F F D F F 4 A simple pendulum attached to the ceiling of a stationary lift has time porind T AF F 2 C F 2F X The lift

Q17 A tank contains water on top of mercury as shown in figure A cubical block of side 10 cm is in equilibrium inside the tank The depth of the block inside mercury is RD of the material of block 8 56 RD of mercury 13 6 a 6 cm b 5 cm c 7 cm d 8 cm Water Mercury Cubical block

A drop of radius 2 x 10 m moves with V 5 8 cm s Then the viscous force on the drop at the terminal speed is Given air 18 x 10 Ns m A O 2 5 x 10 N B O 1 8 x 10 N C O 1 6 x 10 7N D O 3 9 x 10 N

Estimate the time needed for glycine molecule to diffuse a distance of 20 m in water at 20 C Assume the diffusion constant is 9 5x10 4 mm 2 s Select one or more 2 1 ms 210 ms 0 21 s 0 21 s

4 Consider the figure and mark the correct option Piston A 8PM Fresh water Piston B Concentrated sodium chloride solution in water B a Water will move from side A to side B if pressure lower than osmot pressure is applied on piston B b Water will move from side B to side A if pressure greater than osmot pressure is applied on piston B c Water will move from side B to side A if pressure equal to osmot pressure is applied on piston B d Water will move from side A to side B if pressure equal to osmoti proccure is applied on niston A

A conical paper cup is to hold a fixed volume of water Find the ratio of height to base radius of the T p h cone which minimizes the amount of pater needed to make the cup Use the formula for the area of the side of a cone called the lateral area of the cone BIU T

A ball is thrown downward with some velocity into a viscous liquid Which of the following curves may represents the possible variation for velocity versus time Options All of these Solution Apower 4

A piston cylinder with a cross sectional area of fine to another piston cylinder with a cross sectional area of 0 05 m Assume that both chambers and the line are filled with hydraulic fluid of density 900 kg m and the larger second piston cylinder is 6 m higher up in elevation The telescope arm and the buckets have hydraulic piston cylinders moving them as seen in Fig 2 16 With an outside atmospheric pressure of 100 kPa and a net force of 25 kN on the smallest piston what is the balancing force on the second larger piston FIGURE 2 16 Sketch for Example 27 F P2 F2 H

10 A stone of mass 30 gram is placed in a measuring cylinder containing some water The reading water level increases from 50 cm to 60 cm What is the density of the stone 11 A block of wood of mass 12 kg floats in water The volume of the wood is 0 016 m Find the de of the wood

6 Two identical communicating containers have water filled into them A spherical ball of ice relative density 0 9 having volume 100 cm is put into the left vessel Calculate the volume of water flowing into the right container immediately after placing the ball i e don t consider any melting of the ice ball Give your answer for following two cases i The ice ball floats in the water in the left container ii The ice ball gets exactly half immersed in the water iii What will happen to the water level after the ice melts Answer for both i and ii

Along a stream line of a liquid flow 1 The velocity of a fluid particle remains constant 2 The velocity of all fluid particles crossing a given position is constant 3 The velocity of all fluid particles at given instant is constant 4 The speed of a fluid particle is constant

A metal sphere of radius R density Q moves with terminal velocity vi through a liquid of density o Another sphere of same radius but of density Q2 moves through same liquid Its terminal velocity will be 9 9 0 0 Q 0 0 O V 0 V V V

An inverted U tube manometer containing oil S G 0 8 is located between two reservoirs as shown in the figure below The reservoir on the left which contains carbon tetrachloride S G 1 595 is closed and pressurized to 8 psig The reservoir on the right contains water and is open to the atmosphere Perform the following 3 ft 8 psig Carbon tetrachloride 0 7 ft 1 ft 1 ft Oil Water a State three assumptions to solve this problem b Write the basic equations and apply assumptions to obtain an expression for the depth of the water h in the right reservoir c Calculate the depth of water h in feet in the right reservoir

SolveLancer Test From bottom of an ocean a bullet is fired in vertical direction with a velocity of 50 m s Density of bullet is 2000 kg m and density of water is 1000 kg m Find the time after which bullet comes back g 10 m s SolveLancer Test air Water 500 m a 10 sec b 20 sec 10 c sec 3 d 15 sec v 50 m s

When a capillary tube is immersed in water vertically water rises to a height h inside the tube f the radius of another capillary tube is 1 3rd that of the previous the height to which water will ise in this tube is A h 3 B f 3 C 3h D h

Two identical containers have the same volume TW of water in it Each of them is placed on a balance and readings of the two balances are same There is a hollow ball and a solid ball that have same volume The hollow ball floats in water and the solid ball sinks A string from the ceiling suspends the solid ball so that it remains completely submerged in the water in the first container The hollow ball is held submerged in the water in the second container and is held by a string fastened to the bottom of the container Which balance will show higher reading How will your answer change if the string in the second container is cut 4 O

A solid cylinder is rolling up without sliding on a rough inclined plane The frictional force acting on it is Upward along the plane Downward along the plane 3 Zero 4 All may be correct

U tube with limbs of diameters 5mm and 2mm contains water of surface tension 10 2 N m angle of contact is zero and density 10 kg m The difference in the level in the vo limbs is g 10 m s A 8 4 mm B 7 7 mm C 9 5 mm D 6 8 mm

DIMENSIONAL FINDINGS Turpentine oil is flowing through a tube of length I and radius r The pressure difference between the two ends of the tube is P The viscosity of oil is given by n P x 4v where v is the velocity at a distance x from the axis of the tube The imension st of n are a M L T 531 b MLT 1 GA 811 IT 11