Physics
Fluid-Mechanics
Easy
Question
A vertical glass capillary tube, open at both ends, contains some water. Which of the following shapes may not be taken by the water in the tube?
The correct answers are: , ,
Sol: The two free liquid surfaces must provide a net upward force due to surface tension to balances the weight of liquid column.
Related Questions to study
Physics
If n drops of a liquid, each with surface energy E, join to form a single drop, then
If n drops of a liquid, each with surface energy E, join to form a single drop, then
PhysicsFluid-Mechanics
Physics
The wires A and B shown in the figure are made of the same material and have radii ,
and 
respectively. The block between them has a mass m. When the fame F is mg/3, one of the wires breaks. Then
The wires A and B shown in the figure are made of the same material and have radii ,
and respectively. The block between them has a mass m. When the fame F is mg/3, one of the wires breaks. Then
PhysicsFluid-Mechanics
Physics
If a liquid rises to the same height in two capillaries of the same material at the same temperature, then
If a liquid rises to the same height in two capillaries of the same material at the same temperature, then
PhysicsFluid-Mechanics
Physics
Excess pressure can be (2T/R) for
Excess pressure can be (2T/R) for
PhysicsFluid-Mechanics
Physics
Viscous force is somewhat like friction as it opposes, the motion and is non-conservative but not exactly so, because
Viscous force is somewhat like friction as it opposes, the motion and is non-conservative but not exactly so, because
PhysicsFluid-Mechanics
Physics
Four rods A, B, C and D of the same length and material but of different radii ,
and 2r respectively, are held between two rigid walls. The temperature of all rods is increased through the same range. If the rods do not bend, then
Four rods A, B, C and D of the same length and material but of different radii , and 2r respectively, are held between two rigid walls. The temperature of all rods is increased through the same range. If the rods do not bend, then
PhysicsFluid-Mechanics
Physics
A stream of liquid comes out of a water tap of radius R with a velocity u down. At a vertical distance h below the tan radius of the tube of flow will be
A stream of liquid comes out of a water tap of radius R with a velocity u down. At a vertical distance h below the tan radius of the tube of flow will be
PhysicsFluid-Mechanics
Physics
A small hole is made at the bottom of a symmetrical jar as shown in figure. A liquid is filled into the jar up to a certain height. The rate of dissension of liquid is Independent of level of the liquid in the jar. Then the surface of jar is a surface of revolution of curve.
A small hole is made at the bottom of a symmetrical jar as shown in figure. A liquid is filled into the jar up to a certain height. The rate of dissension of liquid is Independent of level of the liquid in the jar. Then the surface of jar is a surface of revolution of curve.
PhysicsFluid-Mechanics
Physics
A square box of water has a small hole located in one of the bottom corners. When the box is full and sitting on a level surface, complete opening of the hole results in a flow of water with a speed v0, as shown. When the box is still half empty, it is tilted by 450 so that the hole is at the lowest point. Now the water will flow out with a speed of
A square box of water has a small hole located in one of the bottom corners. When the box is full and sitting on a level surface, complete opening of the hole results in a flow of water with a speed v0, as shown. When the box is still half empty, it is tilted by 450 so that the hole is at the lowest point. Now the water will flow out with a speed of
PhysicsFluid-Mechanics
Physics
Consider a horizontally oriented syringe containing water located of a height of 1.25 m above the ground. The diameter of plunger is 8 mm and the diameter of the nozzle is 2 mm. The plunger is pushed with a constant speed of 0.25 m/s. Find the horizontal range of water stream on the ground. Take 
.
Consider a horizontally oriented syringe containing water located of a height of 1.25 m above the ground. The diameter of plunger is 8 mm and the diameter of the nozzle is 2 mm. The plunger is pushed with a constant speed of 0.25 m/s. Find the horizontal range of water stream on the ground. Take .
PhysicsFluid-Mechanics
Physics
A cylindrical vessel of height 500 mm has an orifice (small hole) at its bottom. The orifice is initially closed and water is filled in it up to height H. Now the top completely sealed with a cap and the orifice at the bottom is opened. Some water comes out from the orifice and the water level in the vessel becomes steady with due to opening of the orifice.
(Take atmospheric pressure 
, density of water 
and . Neglect any effect of surface tension)
A cylindrical vessel of height 500 mm has an orifice (small hole) at its bottom. The orifice is initially closed and water is filled in it up to height H. Now the top completely sealed with a cap and the orifice at the bottom is opened. Some water comes out from the orifice and the water level in the vessel becomes steady with due to opening of the orifice.
(Take atmospheric pressure , density of water and . Neglect any effect of surface tension)
PhysicsFluid-Mechanics
Physics
If the density of air is ρa and that of the liquid ρl then for a given piston speed the rate (volume per unit time) at which the liquid is sprayed will be proportional to (if h is negligible)
If the density of air is ρa and that of the liquid ρl then for a given piston speed the rate (volume per unit time) at which the liquid is sprayed will be proportional to (if h is negligible)
PhysicsFluid-Mechanics
Physics
A spray gun is shown in figure where a piston pushes air at of a nozzle. A thin tube of uniform cross section is connected to the nozzle. The other end of the tube is in a small liquid container. As the piston pushes air through the nozzle, the liquid from the container rises into the nozzle and is sprayed out. For the spray gun shown, the radii of the piston and the nozzle are 20 mm and 1 mm respectively. The upper end of the container is open to the atmosphere.
If the piston is pushed at a speed of 5 ms-1, the air comes out of the nozzle with a speed of
A spray gun is shown in figure where a piston pushes air at of a nozzle. A thin tube of uniform cross section is connected to the nozzle. The other end of the tube is in a small liquid container. As the piston pushes air through the nozzle, the liquid from the container rises into the nozzle and is sprayed out. For the spray gun shown, the radii of the piston and the nozzle are 20 mm and 1 mm respectively. The upper end of the container is open to the atmosphere.
If the piston is pushed at a speed of 5 ms-1, the air comes out of the nozzle with a speed of
PhysicsFluid-Mechanics
Physics
A cylinder containing water upto a height of 25 cm has a hole of cross section 
at its bottom. It is counter passed in a balance. When water begins to flow out, the initial change in the balancing weight is
A cylinder containing water upto a height of 25 cm has a hole of cross section at its bottom. It is counter passed in a balance. When water begins to flow out, the initial change in the balancing weight is
PhysicsFluid-Mechanics
Physics
A large tank filled with water to a height h is to be emptied through a small hole the bottom. The ratio of the time taken for the level to fall from h to h/2 and that taken for the level to fall from h / 2 to 0 is
A large tank filled with water to a height h is to be emptied through a small hole the bottom. The ratio of the time taken for the level to fall from h to h/2 and that taken for the level to fall from h / 2 to 0 is
PhysicsFluid-Mechanics
