Kerosene oil rises up in a wick of a lantern because of
diffusion of the oil through the wick
capillary action
buoyant force of air
the gravitational pull of the wick
Get Answer
Kerosene oil rises up in wick of a lantern because of capillary action. If the surface tension of oil is zero, then it will not rise, so oil rises up in a wick of a lantern due to surface tension.
For a given volume which of the following will have minimum energy?
Cube
Cone
Sphere
All have same energy
Surface tension may be defined as
the work done per unit area in increasing the surface area of a liquid under isothermal conditions
the work done per unit area in increasing the surface area of a liquid under adiabatic conditions
free surface energy per unit volume
Surface tension = workdone per unit area in increasing the surface area of a liquid under isothermal condition
Which of the following graph represents the variation of surface tension with temperature over small temperature ranges for water?
Over a small temperature ranges, S.T. of water decreases linearly with rise of temperature.
Drops of liquid of density are floating half immersed in a liquid of density . If the surface tension of liquid is , the radius of the drop will
A beaker of radius is filled with a liquid of surface tension . Force across an imaginary diameter on the surface of the liquid is
Surface tension ; diameter Force .
A water film is formed between two straight parallel wires of length apart. If the distance between wires is increased by . What will be the work done?
(surface tension of water dyne )
72 erg
Work done Surface tension increase in area of the film
Increase in area Final area - initial area
There are 2 free surfaces; .
A soap film of surface tension . formed in a rectangular frame cam support a straw as shown in Fig. If , the mass of the straw is
or
The surface tension of water is 75 dyne/cm. Find the minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface. The circumference of the ring is and its weight is :
On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius and making a circular contact of radius with the bottom of the vessel. If and the surface tension of water is , value of just before bubbles detach is: (density of water is )
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