When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to
- pressure of water.
- gravity of the earth.
- shape of rubber bulb.
- atmospheric pressure.
The Correct Option is D
Solution and Explanation
The rise of water in the dropper when the bulb is released is due to atmospheric pressure.
When you press the bulb, you increase the pressure inside the dropper. As a result, the air inside the dropper is expelled, creating a low-pressure zone. When you release the bulb, the atmospheric pressure pushes the water into the dropper to equalize the pressure, causing the water to rise in the dropper. This phenomenon is based on the principle of atmospheric pressure.
Therefore, the correct option is (D): atmospheric pressure.
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