Experiments With Water - Class 5 Evs - Extra Questions

Do you think the oil dissolved in the water? Why do you think so?

I do not think so because oil is insoluble in water. 


Does that mean that the water does not have salt? If it has, then where is the salt?

Of course, water contains salt. It is completely mixed up with water. 


Which of the two would you be able to separate from the water by straining with a cloth - salt or chalk powder? 

We can separate chalk powder by straining with a cloth.


Could you see the salt after it dissolved in water? If no, why?

No, because salt got dissolved completely into the water. 


You put a steel plate on water. Would it sink or float? What would happen to a spoon?

If the steel plate is put carefully over the surface of water, it would float. However, the spoon will sink.


Take some water in a glass. Put a lemon in it. Now keep putting salt in the water, half-a-spoon at a time. Were you able to float your lemon in water?

Yes, the lemon starts to float on water.


Have you seen that something float on water while of others sink? Think how this happens!

Yes, I think that, when water displaced by any thing is greater than it weight, it floats on water otherwise it sinks.


You have washed you handkerchief and you want to dry it quickly. What all can you do?

For that, first the water from the handkerchief should be squeezed out properly and then it should be kept in the sun or pressed (by iron). 


Ayesha put two drops of oil on the lid of her tiffin box. Next to that, she put two drops of water and two drops of sugar solution. She tilted the lid. She saw some drops slid down quickly, while some were left behind.

You also try to do the same and then which drop went ahead? Why did it slide faster?

The water drop went ahead. It happens because water does not stick to the Tiffin box but the sugar and oil drop sticks.


At your house, what things are made in keeping in the sun?

Eatables like mango jelly (aam papad), papad, badis and potato chips are made by keeping in the sun.


You have been given some mishri pleces (lumps of sugar). Suggest some ways to dissolve them quickly.

To dissolve the mishri quickly. First it should be crushed to make powder of it. Then after adding it into water, the mixture should be stirred thoroughly. The minute could also be heated over the flame to dissolve the mishri quickly.


One day Ayesha’s mother put some water to boil on the stove for making tea. She got busy with something and forgot about it. When she remembered and came to check, she found very little water left in the pan.

Think where did the water go?

The water gets evaporated. 


Why did Chiltibabu and Chinnubabu keep their mango Jelly in sun?

They did to evaporate water from their mango jelly so as to preserve it.


Do you know why swimmers float in dead sea?

Swimmers float in Dead sea because the increased salt content makes it dense. Because of which even if the person does not know how to swim she would not drown in the sea but will float in water.


Make a group of four friends. For the experiment, you will need 4-5 glasses or bowls and the things listed in the table. Take some water in each glass. Now try to dissolve one thing in one glass. Observe that happens and note in the table.

ThingsDid it dissolve or
not?		What happened after
keeping for 2 minutes?
1.SaltYesSalt and water got mix together completely.
2.SoilNoSoil sattled down at the bottom of the glass.
3.Chalk powderNoChalk settled down at the bottom of the glass.
4.1 Spoon milkYesMilk and water got mixed together completely.
5.OilYesOil floats on the surface of water.


An object made of glass is immersed in water. Will it float or sink?

A piece of glass sinks in water but it floats in mercury because density of glass is more than that of water but less than that of mercury.


Suggest some ways to Hamid for quickly dissolving of sugar.

One should follow any of these methods to get the sugar back from solution:
1. Stir the mixture thoroughly.
2. Warm the mixture over a flame.


Would the cap of plastic bottle cap sink or float on water?

As the weight of a cap of the plastic bottle is very less as compared to the water, it will float on the water.


What things do you put in water to make tea? Which of those things dissolves in water?

To prepare a cup of tea, we need to use the appropriate amount of things, such as, milk, sugar, tea leaves. Among them, milk and sugar will dissolve in water.


Do you think the oil got dissolved in the water? Why do you think so?

The oil will float as a layer on the surface of the water. Because oil is less dense than water, and thus it creates a surface layer of oil.


Class 5 Evs Extra Questions