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Question
Assertion :A small drop of mercury is spherical but bigger drops are oval in shape. Reason: Surface tension of liquid decreases with increase in temperature.
Assertion :A small drop of mercury is spherical but bigger drops are oval in shape. Reason: Surface tension of liquid decreases with increase in temperature.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The reason any droplet is spherical is due to the surface area to volume ratio. A sphere is the shape with the smallest surface area to volume ratio, as opposed to a square or triangle. Larger ones are affected by the weight and normal forces which exceed the ability of the surface tension to keep the drop in spherical shape. In a zero gravity environment all droplets would be spherical.It is true that surface tension decreases with increase in temperature.Thus option B is correct.
The reason any droplet is spherical is due to the surface area to volume ratio. A sphere is the shape with the smallest surface area to volume ratio, as opposed to a square or triangle. Larger ones are affected by the weight and normal forces which exceed the ability of the surface tension to keep the drop in spherical shape. In a zero gravity environment all droplets would be spherical.
It is true that surface tension decreases with increase in temperature.
Thus option B is correct.
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