Methods of Separation in Everyday Life Class 6 Questions and Answers NCERT Solutions
Class 6 Science Chapter 9 Methods of Separation in Everyday Life Question Answer
Let Us Enhance Our Learning
Question 1.
What purpose does handpicking serve in the process of separation?
(i) Filtration
(ii) Sorting
(iii) Evaporation
(iv) Decantation
Answer:
(ii) Sorting
Question 2.
Which of the following substances are commonly separated using the churning method?
(i) Oil from water
(ii) Sand from water
(iii) Cream from milk
(iv) Oxygen from air
Answer:
(iii) Cream from milk
Question 3.
Which factor is usually essential for the filtration?
(i) Apparatus size
(it) Presence of air
(iii) Pore’ size
(iv) Temperature of the mixture
Answer:
(iii) Pore size
Question 4.
State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s).
(i) Salt can be separated from salt solution by keeping it under the Sun.
Answer:
True
(ii) Handpicking should be used only when the quantity of one component is less.
Answer:
True
(iii) A mixture of puffed rice and rice grains can be separated by threshing.
Answer:
False
A mixture of puffed rice and rice grains can be separated by winnowing.
(iv) A mixture of mustard oil and lemon water can be separated by decantation.
Answer:
True
(v) Sieving is used to separate a mixture of rice flour and water.
Answer:
False
Decantation is used to separate a mixture of rice flour and water.
Question 5.
Match the mixtures in Column I with their method of separation in Column II.
Answer:
| Column I | Column II |
| (i) Grams floour mixed with black gram | (d) Sieving |
| (ii) Chalk powder mixed with water | (e) Filtration |
| (iii) Corn mixed with potatoes | (a) Handpicking |
| (iv) Iron powder mixed with sawdust | (b) Magnetic separation |
| (v) Oil mixed with water | (c) Decantation |
Question 6.
In what situations would you use decantation instead of filtration to separate solids from liquids?
Answer:
Decantation can be used instead of filtration when solid particles are lighter than liquid with which it is mixed and float over the liquid. For examples to separate saw dust from water, talcum powder from water, etc.
Question 7.
Can you relate the presence of nasal hair to any separation process?
Answer:
Nasal hair filters the air we breathe and therefore protects us from infection by airborne viruses, bacteria and other germs.
Question 8.
During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of? What is the role of these masks?
Answer:
We all wore mask during COVID-19 pandemic to project ourselves from infection caused by virus infected air around us. Masks are made of cloth or other material that filters out particles and comfortable or breathable. Masks are generally made of maerials like cotton, synthetic fibers, etc. Their role is to filter out airborne particles, including viruses and bacteria.
We put a mask on our nose to protect our self from dirt, infected or polluted air. Since the mask avoids exposure to the infected air, harmful exhaust of vehicles, thus prevents harmful gases, infected air and dust particles entering our body.
Question 9.
A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
Answer:
Step wise procedure for separating each component from a mixture containing potatoes, salt and sawdust is as follows :
- Step 1. Potatoes can be easily removed from the given mixture by the method of Handpicking.
- Step 2. Then a mixture of salt and sawdust is added to water, salt being soluble in water gets dissolved while sawdust being insoluble gets repaain suspended over the water d*(e to lighter weight.
- Step 3. Sawdust can be separated from salt solution by the process of decantation.
- Step 4. Finally, salt is obtained from salt solution by evaporation.
Question 10.
Read the folloiving story titled ‘Intelligent Leela’ and tick the most appropriate options. Provide a suitable title of your choice for the paragraph. Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/ hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container, she noticed that the water was muddy and fit/unfit for drinking. To purify the water, she kept it for some time and then she filtered/ churned the muddy water using a piece of paper/muslin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a covered pan. After cooling/ v boiling, she filtered/churned it again and made it fit/unfit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.
Answer:
Purification of Water:
Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container, she noticed that the water was muddy and fit/unfit for drinking. To purify the water, she kept it for some time and then she filtered/churned the muddy water using a piece of paper/muslin cloth. Leela, then, cooled/boiled the water for about 10 minutes in a covered pan. After cooling/boiling, she filtered/churned it again and made it fit/unfit for drinking. She served this water to her father while having food, who blessed her and appreciated her efforts.