If we add some table salt to water taken in a glass tumbler and stir with a spoon, we find no salt after sometime. Does the level of water change ? If not, why not ?

Why do we see water droplets on outer surface of a glass containing ice cold water ?

Take some water in a glass add pieces of ice to it observe for a few minutes why are these drops formed

When we put a drop of, red ink in 100 ml. of water, we observe that all the water becomes purple in colour after some time. Why ?

Suppose we have a rectangular aquarium with dimensions of length 8m, width 4m and height 3m. Suppose we are filling the tank with water at the rate of 0.4m^3"/sec." How fast is the height of water changing when the water level is 2.5m?

A little of rice flour is taken in a test tube and water is added to it. A drop of iodine solution is added to the contents of test tube. We see the following colour change:

Spread a piece of wet cloth in the sunlight observe after sometime where has the water in the wet cloth gone the water evaporates into the atmosphere due to the heat of the sun when we want to dry clothes quickly we wave them about or keep them under a fan how are clouds formed?

Spread a piece of wet cloth in the sunlight observe after sometime where has the water in the wet cloth gone the water evaporates into the atmosphere due to the heat of the sun when we want to dry clothes quickly we wave them about or keep them under a fan does the water in wet clothes dry up only due to sunlight or due to other reasons

In the pond , we find that different organisms live in different regions. This is due to some conditions like availability of different amount of food, air, light etc. Now let us study the table 4 , showing organisms living in different regions of a pond and answer the question. Are the leaves of all plants growing in a pond, similar? What is the difference between the leaves of a plant growing at the bottom (hydrilla) and.that floating on the surface (lotus)? Try to think and write why we find such differences.