important questions of seperation of substances chapter 5 class 6 science
Answers
Question 1.
When is handpicking used?
Answer:
Handpicking is used to separate undesirable component when present in small
amount.
Question 2.
What is threshing? How is it done?
Answer:
The process that is used to separate the grain from stalks is threshing. In this process, the stalks are beaten to free the grain seeds. Sometimes, threshing is done with the help of bullocks. Machines are also used to thresh large quantities of grain.
Question 3.
Which type of separation is used in cashew nut factories?
Answer:
Sieving.
Question 4.
Give one example of sieving used in everyday life.
Answer:
Separation of barn (choker) from flour
Question 5.
Name some materials that are used as filters.
Answer:
Cotton, ceramic, filter cloth, filter paper.
Question 6.
Name the process of separating two immiscible liquids.
Answer:
By using separating funnel or by decantation.
Question 5.
Name some materials that are used as filters.
Answer:
Cotton, ceramic, filter cloth, filter paper.
Question 6.
Name the process of separating two immiscible liquids.
Answer:
By using separating funnel or by decantation.
Question 9.
Which process is used to separate bacteria from water?
Answer:
Filtration, by using special filters, i.e., bacteria proof filter.
Question 10.
What is decantation?
Answer:
Decantation is a process of separating insoluble solids from liquids. A suspension of solid particles in liquid is allowed to stand for some time. Solid particles settle down at the bottom, due to their weight.

This is called sedimentation. The clean water is transferred into another beaker, without disturbing the settled particles. This type of separation is called decantation (Fig. 5.7)
Answer:
Question 1.
When is handpicking used?
Answer:
Handpicking is used to separate undesirable component when present in small
amount.
Question 2.
What is threshing? How is it done?
Answer:
The process that is used to separate the grain from stalks is threshing. In this process, the stalks are beaten to free the grain seeds. Sometimes, threshing is done with the help of bullocks. Machines are also used to thresh large quantities of grain.
Question 3.
Which type of separation is used in cashew nut factories?
Answer:
Sieving.
Question 4.
Give one example of sieving used in everyday life.
Answer:
Separation of barn (choker) from flour.
Question 5.
Name some materials that are used as filters.
Answer:
Cotton, ceramic, filter cloth, filter paper.
Question 6.
Name the process of separating two immiscible liquids.
Answer:
By using separating funnel or by decantation.
Question 7.
Which substance is used for loading?
Answer:
Alum (phitkari).
Question 8.
What is the use of alum in loading?
Answer:
Alum is used to make the sedimentation faster. Bv adding alum the clay particles settle down rapidly.
Question 9.
Which process is used to separate bacteria from water?
Answer:
Filtration, by using special filters, i.e., bacteria proof filter.
Question 10.
What is decantation?
Answer:
Decantation is a process of separating insoluble solids from liquids. A suspension of solid particles in liquid is allowed to stand for some time. Solid particles settle down at the bottom, due to their weight.
Separation of Substances Class 6 Extra Questions Science Chapter 5 Methods of Separation Q10
This is called sedimentation. The clean water is transferred into another beaker, without disturbing the settled particles. This type of separation is called decantation (Fig. 5.7).
Explanation: