Question

In a functional siphon, water rushes from the reservoir to the siphon because ______ .

• A. the pressure in siphon is higher than the atmospheric pressure
• B. the pressure in siphon is zero
• C. the pressure in siphon is lower than the atmospheric pressure
• D. the pressure in siphon becomes equal to the atmospheric pressure

Answer 1

The correct option is C the pressure in siphon is lower than the atmospheric pressure

Siphon is a device/tube which allows a liquid to flow through it without any use of a pump. A low pressure is created by the suction effect of a part of liquid flowing under gravity and due to that, liquid rushes from the reservoir to the tube. A fluid always flows from high pressure to low pressure and it continues to do so unless equilibrium is established.