Question

5.
A boat floating in a lake is carrying a number of
cork balls. If the cork balls are unloaded into water,
then water level
[NCERT Pg. 255]
(1) Remains unchanged
(2) Rises
(3) Falls
(4) May rise or fall depends on the number of cork
ball​

Answer 1

Answer:

the correct answer is 1

Explanation:

because it is mention in the question that the boat is in the lake and there are some amount of corcks which will effect the water level but this difference will be very very very small ,surely negligible.

Answer 2

Answer:

The correct option is 1.

Explanation:

The correct option is 1 because it is mention in the question that the boat is in the lake and there are some amount of corcks which will effect the water level but this difference will be very very very small ,surely negligible.

We will try to reach the solution of the question exactly as we said in the help section of the solution.

First, we need to have an initial state of the situation, and we can have that by comparing the density of the ship to the density of the water. We already know that ships float on the surface of water because the density of the material the ship is built from is less than the density of water and therefore does not sink into a body of water. So at first we can say that the ship and the stones in it float on the surface of the water.

Now the question has told us that the stones are placed in the water and asks us what happens. It should be noted that the density of the stones is relatively high than the density of water, due to which the stones sink into the water and replace the water in exactly the same volume as the volume of the stones themselves. this will cause the water level to rise significantly as its replaced volume will now have to compensate by raising the water level to a new height.

So the correct answer is option (A).

Note: This question is quite easy and basic, students make mistakes that while the stones are in the boat, they don't displace any volume of water and float because only the density of the boat material matters. whether they will swim or not. Once placed in the water, their own density will decide whether they will float or not, and they will sink, along with the rise of the water level.

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