Question

Ink does spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.
A. external
B. internal
C. air
D. vacuum

Answer 1

In this question, we know that ink is liquid and it has the property to take any shape and it can be easily moved. The ink is filled in the ink dropper, by the suction of ink with the ink dropper. Due to the pressure difference in the ink dropper and the surrounding ink, the ink is sucked into the ink dropper. So pressure plays an important role in the movement of ink in the ink dropper.

Complete step by step answer:
We know that the atmospheric pressure is the cause of the surrounding Earth's surface. Mathematically, we can define the atmospheric pressure as the force exerted in a unit area on a surface due to the weight of the air.
Whenever there is a difference in pressure inside and outside the system, there is a movement of a liquid.
In this question, the ink is inside the ink dropper and ink does not spill out of an ink dropper when we apply pressure on it because there is no difference in pressure between the atmosphere and inside the ink dropper that means pressure inside the ink dropper is equal to the atmospheric pressure.

So, the correct answer is “Option A”.

Note:
In this question, students have the knowledge of the term vacuum pressure, gauge pressure and atmospheric pressure to solve this question correctly and accurately. And also we have to know the mechanism of suction of ink in the ink dropper.