A thin liquid film formed between a U-shaped wire and a light slider supports a weight of (see figure). The length of the slider is and its weight negligible. The surface tension of the liquid film is
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At equilibrium, weight of the given block is balanced by force due to surface tension, i.e.,
2 L.
or
Surface tension of a liquid is due to
gravitational force between molecules
electrical force between molecules
adhesive force between molecules
cohesive force between molecules
Surface tension of a liquid is due to force of attraction between like molecules of a liquid i.e., cohesive force between the molecules.
If a water drop is kept between two glass plates, then its shape is
None of these
Angle of contact is acute.
A drop of oil is placed on the surface of water. Which of the following is correct?
It will remain on it as a sphere
It will spread as a thin layer
It will partly be a spherical droplet and partly a thin film
It will float as a distorted drop on the water surface
The surface tension of oil is less than that of water, so the oil spreads as a thin layer.
Due to capillary action, a liquid will rise in a tube if angle of contact is
acute
obtuse
zero
; The liquid will rise i.e., is positive if is ; It is so if or is acute.
With the increase in temperature, the angle of contact
decreases
increases
remains constant
sometimes increases and sometimes decreases
With the increase in temperature, the surface tension of liquid decreases and angle of contact also decreases.
If a soap bubble formed at the end of the tube is blown very slowly, then the graph between excess pressure inside the bubble with time will be a
straight line sloping up
straight line sloping down
parabolic curve sloping down
parabolic curve sloping up
Excess pressure inside the soap bubble
If two soap bubbles of different radii are in communication with each other then
air flows from the larger bubble into the smaller one until the two bubbles are of equal size
the size of the bubbles remains the same
air flows from the smaller bubble into the larger one and the larger one grows at the expense of the smaller one
the air flows from the larger into the smaller bubble until the radius of the smaller one becomes equal to that of the larger one and of the larger one equal to that of the smaller one.
Excess of pressure in a soap bubble, i.e., therefore pressure in a smaller bubble is more than that of a bigger bubble. When two bubbles of different radii are in communication, then the air flows from higher pressure to lower pressure i.e., from smaller bubble into larger one.
Two water droplets merge with each other to form a larger droplet. In this process
energy is liberated
energy is absorbed
energy is neither liberated nor absorbed
some mass is converted into energy
When two drops merge together to form one drop, the surface area of drop will decrease, due to which the energy of bigger drop is less than the sum of the energy of two smaller drops. Due to it, the energy is released.
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