Methods of Separation in Everyday Life
Fill in the Blanks:
- The process of separating grains from stalks is called __________.
- (Answer: Threshing)
- The method of separating husk from grains by blowing air is called __________.
- (Answer: Winnowing)
- __________ is used to separate insoluble solids from a liquid using a filter.
- (Answer: Filtration)
- The process in which a liquid turns into its vapor is called __________.
- (Answer: Evaporation)
- The process of settling down heavier particles at the bottom of a liquid is called __________.
- (Answer: Sedimentation)
- __________ is a process used to separate butter from curd.
- (Answer: Churning)
- __________ separation is used to separate magnetic materials like iron from non-magnetic materials.
- (Answer: Magnetic)
- __________ is used when the components of a solid mixture have different sizes.
- (Answer: Sieving)
- Salt can be separated from seawater by the process of __________.
- (Answer: Evaporation)
- The method of removing large unwanted particles by hand is called __________.
- (Answer: Handpicking)
True / False
- Handpicking is an efficient method to separate fine particles of sand from wheat.
- (False: Handpicking is used for larger particles like stones.)
- Winnowing is used to separate lighter particles like husk from grains.
- (True)
- Threshing is the process of separating grains from husk by blowing air.
- (False: Threshing separates grains from stalks by beating them.)
- Filtration is used to separate a solid dissolved in a liquid.
- (False: Filtration is used to separate insoluble solids from a liquid.)
- Magnetic separation can be used to separate iron from a mixture of sand and iron filings.
- (True)
- Sedimentation is the process of separating lighter substances from heavier ones using air.
- (False: Sedimentation is the process where heavier particles settle at the bottom of a liquid.)
- Churning is used to separate cream from milk or butter from curd.
- (True)
- Sieving is used to separate different sizes of solid particles from a mixture.
- (True)
- Decantation is used to separate oil from water by boiling the mixture.
- (False: Decantation separates oil from water by letting the oil float on top.)
- Evaporation is used to obtain salt from saltwater by heating the water.
- (True)
Question / Answer
1. What is handpicking, and when is it used?
Answer: Handpicking is a method of separating small impurities like stones or husk from grains by hand. It is used when the impurities are easily visible and can be picked out by hand based on size, color, or shape.
2. What is threshing, and why is it important in agriculture?
Answer: Threshing is the process of separating grains from stalks by beating them. It is important in agriculture as it helps farmers obtain clean grains from harvested crops, a crucial step before winnowing.
3. Describe the process of winnowing. What type of materials can be separated using this method?
Answer: Winnowing involves separating lighter components (like husk) from heavier grains using wind or blowing air. This method is commonly used for separating grains from husk after threshing.
4. What is sieving? Give an example of where it is used.
Answer: Sieving is the method of separating components based on differences in particle size using a sieve. For example, sieving is used to separate bran from flour or small stones from sand.
5. How is salt obtained from seawater?
Answer: Salt is obtained from seawater through the process of evaporation. Seawater is kept in shallow pits where sunlight evaporates the water, leaving behind salt, which can be further purified.
6. What is sedimentation? How is it different from decantation?
Answer: Sedimentation is the process where heavier solid particles settle down at the bottom of a liquid. Decantation involves gently pouring out the liquid, leaving the sediment behind. Both processes are used to separate insoluble solids from liquids.
7. What is filtration, and how is it useful in everyday life?
Answer: Filtration is the process of separating insoluble solid particles from a liquid using a filter (such as cloth or filter paper). It is useful in daily life, for example, to filter tea leaves from tea or to purify muddy water.
8. What is the method of separation used to extract butter from curd?
Answer: Churning is used to separate butter from curd. When curd is churned, the lighter butter floats on top, and buttermilk is left behind.
9. What is magnetic separation? Provide an example.
Answer: Magnetic separation is the process of using a magnet to separate magnetic substances from a mixture. An example is removing iron nails from a pile of sawdust using a magnet.
10. What are the advantages of using filtration over decantation?
Answer: Filtration is more effective than decantation because it can remove even very fine insoluble particles from liquids. In decantation, some particles may still remain in the liquid, whereas filtration ensures clearer separation.
11. How is winnowing different from threshing?
Answer: Winnowing is the process of separating lighter components like husk from heavier grains using wind or air. Threshing, on the other hand, is the process of beating harvested crops to separate grains from the stalks.
12. Explain how sieving is used in construction.
Answer: In construction, sieving is used to separate stones and pebbles from sand. This ensures that fine sand is available for construction purposes without large particles that could affect the quality of the work.
13. Why is evaporation an effective method for obtaining salt from seawater?
Answer: Evaporation is effective because when seawater is left in shallow pits under the sun, the water gradually evaporates, leaving behind salt crystals. The solid salt can then be collected and purified.
14. What is the role of filtration in everyday life? Provide an example.
Answer: Filtration helps separate insoluble solid particles from liquids, making them cleaner for use. For example, filtration is used in households to purify water by removing impurities or in tea-making to separate tea leaves from the tea.
15. Describe how decantation is used to separate oil and water.
Answer: Decantation is used to separate oil and water by allowing the oil to float on top of the water since oil is less dense. The water can then be gently poured out, leaving the oil behind.
16. What is the importance of sedimentation in the purification of water?
Answer: Sedimentation is important for purifying water because it allows heavy impurities like sand and mud to settle at the bottom, making it easier to remove the clearer water on top through decantation or filtration.
17. What method would you use to separate a mixture of iron filings and sand?
Answer: Magnetic separation would be used to separate iron filings from sand. A magnet is moved through the mixture, attracting the iron filings while leaving the sand behind.
18. What is churning, and how is it used to separate components in dairy products?
Answer: Churning is the process of shaking or rotating curd to separate butter from buttermilk. The lighter butter floats on top, while the buttermilk remains at the bottom.
19. Give an example where handpicking is not an efficient method of separation.
Answer: Handpicking is not efficient when the impurities or unwanted substances are too small or mixed in large quantities, such as separating fine sand from grains. In such cases, other methods like sieving or winnowing are more appropriate.
20. Why can’t we use sieving to separate salt from saltwater?
Answer: Sieving is used to separate solid particles of different sizes, but in saltwater, the salt is dissolved in the water, forming a solution. Evaporation or filtration would be needed to separate the dissolved salt from water.
Nice extra questions and answers 😃