Last updated on April 24th, 2024 at 04:38 am
Maharashtra Board Class 4 EVS Water Safe for Drinking
If you are looking for solutions of Maharashtra Board Class 4 EVS Water Safe for Drinking then you are at the right place.
Answer the following questions.
Q: Name the substances used to make the solution called lemon sherbet.
A: The substances used to make the solution called lemon sherbet typically include lemon juice, sugar, water, and sometimes carbonated water or soda.
Q: Why is it that water that looks clean and transparent may not be fit for drinking?
A: Water that looks clean and transparent may not be fit for drinking because even though it may appear clean, it could still contain harmful microorganisms or dissolved impurities that are not visible to the naked eye. These impurities could pose health risks if ingested.
Q: When making a sherbet, what do we do to make sugar dissolve quickly?
A: To make sugar dissolve quickly when making a sherbet, we typically stir or agitate the mixture vigorously. This increases the surface area of the sugar particles in contact with the water, facilitating faster dissolution.
Q: Does oil float on water or sink in it?
A: Oil typically floats on water because it is less dense than water. Oil and water do not mix well due to differences in polarity and density, so oil forms a distinct layer on the surface of water.
Fill in the blanks.
- Substances like salt and sugar ……………….. after some time when added to water.[dissolve]
2. The mixture obtained on dissolving a substance in water is called a ………….. .[solution]
3. ORS is an example of ……………. solutions.[useful]
4. All micro-organisms are not useful. Some can cause …………. if they enter our body.[diseases]
5. Things that float in water are ………. than it and things that sink are………..than it.[lighter , heavier]
6. A substance called ……………… is swirled in muddy water to help clean the water.[alum]
True or false ?
- Alum powder does not dissolve in water.[False]
2. Micro-organisms cannot live in water. [False]
3. If muddy water remains still, a sediment is formed at its bottom.[True]
4. An eraser floats in water. [False]
5. Tea leaves can be separated from tea by filtration.[True]
Additional Que Ans
Q: What is the purpose of swirling alum in muddy water?
A: Swirling alum in muddy water helps the soil particles to settle down, aiding in the cleaning process.
Q: Why is it necessary to boil water even after it has been cleaned by settling and filtration?
A: Boiling water is necessary to kill any remaining microorganisms that may be present, ensuring it is safe for drinking.
Q: What precaution should be taken if water has a foul smell or color?
A: Water with a foul smell or color should be avoided as it may indicate the presence of contaminants that could make us ill.
Q: Why do some substances dissolve in water while others do not?
A: Substances dissolve in water if they are soluble, meaning their molecules can mix evenly with the water molecules. Other substances do not dissolve if they are insoluble, meaning their molecules do not mix with water.
