Short & Long Question Answers: Methods of Separation in Everyday Life | Science for Class 6 PDF Download

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Short Answer Questions:

Q1. What method is used to separate small stones from grains?
Ans: Handpicking is used to separate small stones from grains. It involves removing stones based on differences in size, color, and shape.

Q2. What is threshing used for?
Ans: Threshing is used to separate grains from stalks by beating the stalks to release the grains.

Q3. What is the process of separating lighter husk from heavier grains called?
Ans: The process is called winnowing, where wind or air blows away the lighter husk, leaving behind the heavier grains.

Q4. What is sieving used for?
Ans: Sieving is used to separate particles of different sizes, where smaller particles pass through a mesh, and larger ones are left behind.

Q5. What happens during evaporation?
Ans: Evaporation is the process where a liquid turns into gas by heat, leaving behind any dissolved solids.

Q6. What is sedimentation?
Ans: Sedimentation is the process where heavier particles settle at the bottom of a liquid due to gravity.

Q7. What is decantation?
Ans: Decantation is the process of pouring off liquid from solid particles that have settled at the bottom.

Q8. What is filtration used for?
Ans: Filtration is used to separate solid particles from liquids by passing the mixture through a filter.

Q9. What method is used to separate butter from curd?
Ans: Churning is used to separate butter from curd by causing the butter to float on top.

Q10. How are magnetic substances separated from non-magnetic substances?
Ans: Magnetic separation is used to separate magnetic substances like iron using a magnet.

Long Answer Questions:

Q1. Explain the process of winnowing and its application in agriculture.
Ans: Winnowing is the process of separating lighter components, like husk, from heavier grains using wind or air. In agriculture, farmers use winnowing to separate husk from the harvested grains. They use traditional tools like a soop (bamboo tray) or a more modern mechanical winnower. The grains are thrown into the air, and the wind blows away the lighter husk, while the heavier grains fall back down. This method is efficient and widely used in rural areas to clean grains.

Q2. Describe the method of filtration and its importance in everyday life.
Ans: Filtration is a process used to separate solid particles from a liquid by using a filter. A filter paper or cloth is often used to allow only the liquid to pass through while trapping solid particles. Filtration is essential in everyday life, particularly for purifying water, removing impurities from liquids, and cleaning liquids in various industries. For example, tea leaves are separated from tea using a strainer, which is a form of filtration.

Q3. What are the differences between decantation and filtration?
Ans: Decantation and filtration are both methods of separating solid components from liquids, but they differ in the technique used. Decantation involves carefully pouring a liquid off the top of a mixture, leaving the solid components behind, typically after the solid has settled at the bottom due to gravity. It is a simple and quick method. On the other hand, filtration uses a filter to separate solid particles from a liquid, which is more effective for finer particles that do not settle easily.

Q4. How is salt extracted from seawater using evaporation, and what are the steps involved?
Ans: Salt can be extracted from seawater by evaporation. First, seawater is collected in shallow pits or large pans. The water is left exposed to sunlight and air, causing the water to evaporate. As the water evaporates, the dissolved salt remains behind as a solid. This process may take a few days depending on weather conditions. Once the water has completely evaporated, the salt is collected, purified, and used for various purposes.

Q5. Explain how a magnet is used to separate iron nails from sawdust.
Ans: To separate iron nails from sawdust, a magnet is moved through the sawdust. Iron nails are magnetic substances, so they are attracted to the magnet, while the non-magnetic sawdust remains unaffected. As the magnet is moved through the mixture, all the iron nails get attracted to it, making it easy to separate them from the sawdust. This method is known as magnetic separation.