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Q1. The process of separating useful components from a mixture is called:
Separation is the process of separating useful components from a mixture. It is done to remove impurities or to obtain pure substances. Separation is an important process in our daily life, from cooking to industrial processes.
Q2. A combination of two or more substances that are not chemically combined is called a:
A mixture is a combination of two or more substances that are physically mixed but not chemically combined. The components of a mixture can be separated by physical methods. Examples include sand and water, salt and water, and iron filings and sulphur.
Q3. The process of separating grains from freshly cut crops is called:
Threshing is the process of separating grains from freshly cut crops by beating or crushing them. It is done to separate the edible part (grain) from the non-edible part (husk and stalk). This is an important step in agriculture before the grains are used.
Q4. The process of separating husk from grains by blowing air is called:
Winnowing is the process of separating lighter husk particles from heavier grains by blowing air. The wind carries away the light husk, while the heavier grains fall down. This method is commonly used in rural areas after threshing.
Q5. The process of separating larger particles from smaller ones using a net-like device is called:
Sieving is the process of separating particles of different sizes using a sieve. A sieve has small holes that allow smaller particles to pass through while retaining larger ones. This method is used in kitchens to separate flour from bran and in construction to separate sand from stones.
Q6. The process of separating solid particles from a liquid by passing the mixture through a filter paper is called:
Filtration is the process of separating insoluble solid particles from a liquid by passing the mixture through a filter paper or cloth. The filter paper traps the solid particles, while the liquid passes through. This method is used to purify water and in many industrial processes.
Q7. The process of allowing heavy insoluble particles to settle at the bottom of a liquid is called:
Sedimentation is the process of allowing heavy insoluble particles to settle at the bottom of a liquid by keeping the mixture undisturbed. The settled particles are called sediment. This is often the first step in water purification.
Q8. The process of pouring out the clear liquid from the top without disturbing the sediment is called:
Decantation is the process of gently pouring out the clear liquid from the top of a container after sedimentation. The sediment remains at the bottom. This method is used to separate a liquid from insoluble solid particles.
Q9. The process of separating a soluble solid from a liquid by heating the solution is called:
Evaporation is the process of separating a soluble solid from a liquid by heating the solution. The liquid evaporates, leaving the solid behind. This method is used to obtain salt from sea water.
Q10. The process of separating cream from milk by spinning it rapidly is called:
Churning is the process of rapidly agitating or spinning milk or curd to separate butter or cream from it. The fat globules come together and separate from the liquid. This method is commonly used in dairy farming to make butter.
Q11. The process of manually picking out unwanted substances from a mixture is called:
Handpicking is the simplest method of separation, where unwanted substances are picked out by hand from a mixture. This method is used when the unwanted substances are present in small quantities and can be easily identified. Examples include picking stones from rice or pulses.
Q12. The process of separating magnetic materials from non-magnetic materials using a magnet is called:
Magnetic separation is the process of separating magnetic materials like iron from non-magnetic materials using a magnet. The magnet attracts the magnetic particles, leaving the non-magnetic ones behind. This method is used to separate iron filings from a mixture.
Q13. Which method is used to separate tea leaves from tea?
Tea leaves are separated from tea by filtration using a strainer. The strainer acts as a filter, allowing the liquid tea to pass through while trapping the tea leaves. This is a common example of filtration in daily life.
Q14. Which method is used to separate sugar from sugar solution?
Sugar can be separated from a sugar solution by evaporation. When the solution is heated, the water evaporates, leaving sugar crystals behind. This method is based on the fact that sugar is soluble in water and does not evaporate.
Q15. Which method is used to separate sand and water?
Sand and water can be separated by sedimentation followed by decantation or by filtration. In sedimentation, sand settles at the bottom, and the water is poured out by decantation. In filtration, the sand is trapped in the filter paper.
Q16. Which method is used to separate salt from sea water?
Salt is obtained from sea water by the process of evaporation. Sea water is allowed to stand in shallow ponds, and the sun’s heat evaporates the water, leaving salt crystals behind. This is a common method used in coastal areas.
Q17. Which method is used to separate iron filings from a mixture of iron filings and sulphur powder?
Iron filings can be separated from sulphur powder using a magnet. The magnet attracts the iron filings, leaving the sulphur powder behind. This method is based on the magnetic property of iron.
Q18. Which method is used to separate chaff (husk) from wheat grains?
Chaff (husk) is separated from wheat grains by winnowing. The mixture is dropped from a height, and the wind blows away the lighter chaff, while the heavier wheat grains fall down. This method is commonly used in agriculture.
Q19. Which method is used to separate stones from rice?
Stones can be separated from rice by handpicking because the stones are large enough to be seen and picked out. This method is used when the quantity of stones is small. It is a simple and effective method.
Q20. Which method is used to separate bran from flour?
Bran is separated from flour by sieving. A sieve with fine holes allows the fine flour to pass through, while the coarse bran particles are retained. This method is used in flour mills and at home.
Q21. Which method is used to separate oil from water?
Oil and water can be separated by decantation because oil is immiscible with water and floats on top. The oil layer can be gently poured out. This method is used to separate oil from water in many industries.
Q22. Which method is used to separate cream from milk?
Cream is separated from milk by churning. The milk is churned rapidly, causing the fat globules to come together and form butter or cream. This is how butter is made from milk.
Q23. Which method is used to separate insoluble solid particles from a liquid by settling?
Sedimentation is used to separate insoluble solid particles from a liquid by allowing them to settle at the bottom. This is the first step in water purification. The settled particles are called sediment.
Q24. Which method is used to separate a clear liquid from a sediment?
Decantation is used to separate a clear liquid from a sediment by gently pouring out the liquid. The sediment remains at the bottom. This method is used after sedimentation.
Q25. Which method is used to separate dust particles from air?
Dust particles can be separated from air by filtration using a filter or a cloth. The filter traps the dust particles, allowing clean air to pass through. This is used in air purifiers and vacuum cleaners.
Q26. The method of separation used when the components of a mixture are of different sizes is:
Sieving is used when the components of a mixture are of different sizes. A sieve has holes of a specific size that allow smaller particles to pass through while retaining larger ones. This method is used to separate flour from bran and sand from stones.
Q27. The method of separation used when the components have different weights is:
Winnowing is used when the components have different weights. The lighter component is blown away by the wind, while the heavier component falls down. This method is used to separate husk from grains.
Q28. The method of separation used when a component is soluble in water is:
Evaporation is used to separate a soluble component from a solution. The liquid evaporates, leaving the soluble solid behind. This method is used to obtain salt from salt water.
Q29. The method of separation used when a component is magnetic is:
Magnetic separation is used when a component of a mixture is magnetic. A magnet attracts the magnetic component, separating it from non-magnetic materials. This method is used to separate iron from other materials.
Q30. The method of separation used to remove insoluble impurities from water at home is:
At home, we often use a combination of sedimentation, decantation and filtration to remove insoluble impurities from water. Sedimentation allows heavy particles to settle, decantation removes the clear water, and filtration removes any remaining particles.
Q31. The method of separation used in a flour mill to separate fine flour from bran is:
In flour mills, sieving is used to separate fine flour from coarse bran. A sieve with fine holes allows the flour to pass through, while the bran is retained. This gives us pure, fine flour.
Q32. The method of separation used to separate cream from milk is called:
Churning is the process of rapidly agitating milk to separate cream from it. The fat globules come together and form butter or cream. This is how butter is made.
Q33. The method of separation used to separate salt from salt water is:
Salt is separated from salt water by evaporation. When the salt water is heated, water evaporates, leaving salt crystals behind. This is how salt is obtained from sea water.
Q34. The method of separation used to separate iron nails from sawdust is:
Iron nails can be separated from sawdust using a magnet. The magnet attracts the iron nails, leaving the sawdust behind. This method is based on the magnetic property of iron.
Q35. The method of separation used to separate pebbles from sand is:
Pebbles can be separated from sand by sieving. A sieve with holes smaller than pebbles but larger than sand grains will allow sand to pass through while retaining pebbles. This method is used in construction.
Q36. The method of separation used to separate tea leaves from tea is an example of:
Tea leaves are separated from tea by filtration using a strainer. The strainer acts as a filter, trapping the tea leaves and allowing the liquid tea to pass through. This is a common example of filtration in daily life.
Q37. The method of separation used to separate muddy water is:
Muddy water can be purified by sedimentation, decantation and filtration. First, the mud settles at the bottom (sedimentation). Then, the clear water is poured out (decantation). Finally, the water is filtered to remove any remaining particles.
Q38. The method of separation used to separate husk from paddy is:
Husk is separated from paddy (rice) by winnowing. The mixture is dropped from a height, and the wind blows away the lighter husk, while the heavier rice grains fall down. This is a common method used in farming.
Q39. The method of separation used when the components of a mixture have different densities is:
Winnowing is used when the components have different densities. The lighter component is blown away by the wind, while the heavier component falls down. This method is based on the difference in density.
Q40. The method of separation used when a component is insoluble in water and settles at the bottom is:
When a component is insoluble in water, it can be separated by sedimentation and decantation. The insoluble solid settles at the bottom (sedimentation), and the clear liquid is poured out (decantation). This method is used to separate sand from water.
Q41. The method of separation used when a component is soluble in water and the liquid needs to be removed is:
When a solid is soluble in water, it can be separated by evaporation. The liquid is heated, and it evaporates, leaving the solid behind. This method is used to obtain salt from salt water.
Q42. The method of separation used to separate cream from milk is based on the principle of:
Cream is separated from milk by churning, which is based on the difference in density. The fat globules (cream) are lighter and rise to the top. Churning helps to bring these fat globules together.
Q43. The method of separation used to separate iron filings from a mixture of iron filings and sand is:
Iron filings can be separated from sand using a magnet. The magnet attracts the iron filings, leaving the sand behind. This method is based on the magnetic property of iron.
Q44. The method of separation used when a substance is easily visible and present in small quantity is:
Handpicking is used when the unwanted substance is easily visible and present in small quantity. The unwanted substances can be picked out by hand. This method is used to remove stones from rice or pulses.
Q45. The method of separation used to remove fine dust particles from flour is:
Fine dust particles can be removed from flour by sieving. A sieve with fine holes allows the fine flour to pass through, while the dust and coarse particles are retained. This purifies the flour.
Q46. The method of separation used in water treatment plants to remove impurities is:
Water treatment plants use sedimentation, decantation and filtration to remove impurities from water. Heavy impurities settle by sedimentation, clear water is decanted, and fine impurities are removed by filtration. This makes the water safe for drinking.
Q47. The method of separation used to separate butter from curd is:
Butter is separated from curd by churning. The curd is churned rapidly, causing the butter to separate from the liquid. This is how butter is made at home and in factories.
Q48. The method of separation used when the components of a mixture are in different physical states (solid and liquid) is:
When a mixture contains a solid and a liquid, the solid can be separated by filtration or decantation. In filtration, the solid is trapped in a filter. In decantation, the liquid is poured out after the solid settles.
Q49. The method of separation used when the components of a mixture have different boiling points is:
Evaporation is used when a soluble solid and a liquid with different boiling points are mixed. The liquid evaporates at a lower temperature, leaving the solid behind. This method is used to separate salt from water.
Q50. The need for separation of mixtures arises because:
We need to separate mixtures to remove impurities, obtain pure substances and use different components. For example, we separate stones from rice for cooking, and we separate salt from sea water for eating.
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Q51. Which method is used to separate a mixture of sand and salt?
Sand and salt can be separated by dissolving the salt in water, filtering the sand and then evaporating the water to obtain salt. First, the salt dissolves, and the sand is filtered out. Then, the salt water is evaporated.
Q52. Which method is used to separate a mixture of oil and vinegar?
Oil and vinegar are immiscible liquids and can be separated by decantation. Oil forms a layer on top of vinegar and can be gently poured out. This is based on the difference in density.
Q53. Which method is used to separate a mixture of sugar and wheat flour?
Sugar and wheat flour can be separated by sieving because they have different particle sizes. A sieve with appropriate holes will allow the finer flour to pass through, while the larger sugar crystals are retained.
Q54. Which method is used to separate a mixture of iron and copper?
Iron and copper can be separated by magnetic separation because iron is magnetic, while copper is not. A magnet will attract the iron particles, leaving the copper behind. This is a very effective method for separating magnetic metals from non-magnetic ones.
Q55. Which method is used to separate a mixture of rice and water?
Rice and water can be separated by filtration using a strainer or a cloth. The strainer traps the rice grains, while the water passes through. This is a common method used in cooking.
Q56. The process of separating grains from stalks by beating is called:
Threshing is the process of separating grains from the stalks by beating or crushing the harvested crop. It is done to loosen the grains from the husk and is an important step in agriculture.
Q57. The process of separating lighter particles from heavier ones by wind is called:
Winnowing is the process of separating lighter particles like husk from heavier grains like wheat or rice using wind. The mixture is dropped from a height, and the wind carries away the lighter particles while the heavier ones fall down.
Q58. The process of separating smaller particles from larger ones using a sieve is called:
Sieving is the process of separating particles of different sizes using a sieve with holes of a specific size. Smaller particles pass through the holes, while larger particles are retained on the sieve. This method is used in many industries and in daily life.
Q59. The process of separating a solid from a liquid by heating is called:
Evaporation is the process of separating a soluble solid from a liquid by heating the solution. The liquid turns into vapour and escapes, leaving the solid behind. This is used to obtain salt from sea water.
Q60. The method of separation that involves the use of a magnet is called:
Magnetic separation is a method that uses a magnet to separate magnetic substances from non-magnetic ones. The magnet attracts the magnetic particles, allowing them to be easily removed from the mixture. This method is used to separate iron from other materials.