[amp_mcq option1=”equal to atmospheric” option2=”less than atmospheric” option3=”more than atmospheric” option4=”none of the above” correct=”option2″]
The correct answer is B. less than atmospheric.
A siphon is a device used to transfer liquids from one container to another, using the principle of atmospheric pressure. The siphon works by creating a partial vacuum at the top of the tube, which draws the liquid up the tube and out of the container. The pressure at the summit of a siphon is less than atmospheric pressure because the liquid is being pulled up the tube by the vacuum.
Option A is incorrect because the pressure at the summit of a siphon is not equal to atmospheric pressure.
Option C is incorrect because the pressure at the summit of a siphon is not more than atmospheric pressure.
Option D is incorrect because the pressure at the summit of a siphon is not none of the above.