Question

4. An empty plastic bottle closed with an airtight
stopper is pushed down into a bucket filled
with water. As the bottle is pushed down,
there is an increasing force on the bottom.
This is because,
(a) more volume of liquid is dispaced.
(b) more weight of liquid is displaced.
(c) pressure increases with depth.
(d) All the above.​

Answer 1

Answer:

C. Pressure increases with depth.

Answer 2

Answer:

There is an increasing force on the bottom due to more volume, more weight and increase in pressure

Option D

Explanation:

As an empty bottle is made airtight, it is pushed down the bucket of water, at first, the bottle displaces water equal to the volume of the part of it underwater. And as it is pushed more, more volume of water, and subsequently more weight of water is displaced.

This leads to increasing upthrust by water according to the Archimedes principle. And as the bottle is fully underwater, the fluid pressure comes to play a role, which increases with depth. So, all the answers are correct.