Question

ink does not fall out of the dropper because- 1.the atmospheric pressure outside is more 2.the atmospheric pressure inside the dropper is more 3.pressure inside and outside the dropper is equal 4.pressure inside dropper is less

Answer 1

There are 2 correct answers given in the options - Option 1 and option 4.

1. The atmospheric pressure outside is more.

4. The pressure inside dropper is less.


As the ink dropper is pressed, a lower pressure is created and it sucks the ink due to the ink dropper. After entering into the dropper, the ink will be present at the lower pressure than the outside atmospheric pressure. Liquids like ink cannot flow from lower pressure to the higher pressure. Thus, the ink remains inside the ink dropper without dropping unless more pressure is applied to it by pressing its rubber.

Answer 2

Well, out of the options you provided option 1 and option 4 both are correct

This is because the dropper takes up the ink due to the low pressure inside now the area in which ink is present will low pressure as compared to high atmospheric pressure . So the ink can't go towards the high pressure from the lower one thus resulting in it's retention in dropper and so it don't fall.

Now here option option 1 ( the atmospheric pressure outside is more) and option 4 (pressure inside dropper is less) are true for this condition.