Methods of Separation in Everyday Life Class 6 Questions and Answers NCERT Solutions
Class 6 Science Chapter 9 Methods of Separation in Everyday Life
Intext Questions
(Page no. 165)
Question 1.
A small amount of puffed rice is mixed with chana dal. Can you think of separating the mixture by any method other than handpicking?
Answer:
Yes, the other method is winnowing.
(Page no. 166)
Question 2.
Valli is unable to separate husk from rice in a closed room. How can you help her?
Answer:
We can help her by placing a fan for air blowing the lighter husk.
(Page no. 167)
Question 3.
Have you ever observed sieves being used at construction sites to separate pebbles and stones from the sand?
Answer:
Yes, large sieves are used for such purpose.
(Page no. 168)
Question 4.
Have you ever observed white patches on the dark coloured clothes you wear during hot summers? How are these patches formed?
Answer:
Yes, these patches are formed due to evaporation of water from sweat leaving behind salt.
(Page no. 169)
Question 5.
Observe the figure, Does it answer the question? Can you name the process involved?
Answer:
Yes, it answer the question. The process involved is condensation.
(Page no. 170)
Question 6.
In the chapter ‘Materials Around Us’, you have studied that oil does not mix with water and forms a separate layer when left undisturbed for some time. Which method of separation would you use to separate oil and water?
Answer:
Decantation process.
Let Us Enhance Our Learning
Question 1.
What purpose does hand picking serve in the process of separation?
(i) Filtration
(ii) Sorting
(iii) Evaporation
(iv) Decantation
Answer:
(ii) Sortin
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
(ii) Presence of air
(iii) Pore size
(iv) Temperature of the mixture
Answer:
(iii) Pore size
Question 4.
State with the 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.
(ii) Handpicking should be used only when the quantity of one component is less.
(iii) A mixture of puffed rice and rice grains can be separated by threshing.
(iv) A mixture of mustard oil and lemon water can be separated by decantation.
(v) Sieving is used to separate a mixture of rice flour and water.
Answer:
(i) True
(ii) False: This mixture can be separated by handpicking or winnowing.
(iii) True
(iv) True
(v) False: Sieving is used to separate a mixture of rice flour and rice bran.
Question 5.
Match the mixture in Column I with their method of separation in Column II.
| Column I | Column II | ||
| (i) | Gram flour mixed with black gram. | (a) | Handpicking |
| (ii) | Chalk powder mixed with water. | (b) | Magnetic separation |
| (iii) | Com mixed with potatoes. | (c) | Decantation |
| (iv) | Iron powder mixed with saw-dust. | (d) | Sieving |
| (v) | Oil mixed with water. | (e) | Filtration |
Answer:
| Column I | Column II | ||
| (i) | Gram flour mixed with black gram. | (d) | Sieving |
| (ii) | Chalk powder mixed with water. | (e) | Filtration |
| (iii) | Com mixed with potatoes. | (a) | Handpicking |
| (iv) | Iron powder mixed with saw-dust. | (b) | Magnetic separation |
| (v) | Oil mixed with water. | (e) | Decantation |
Question 6.
In what situations would you use decantation instead of filtration to separate solids from liquids?
Answer:
The method of decantation can be used for separating two immiscible liquids i.e. which do not mix together. For example, separating sand from water.
Question 7.
Can you relate the presence of nasal hair to any separation process?
Answer:
In human beings, air is taken into the body through the nostrils. The air passing through the nostrils is filtered by fine hairs that line the passage.
Question 8.
During the COVID-19 pandemic, all of us wore masks. Generally, what materials are they made of? What is the role of these masks?
Answer:
Masks are generally made of multiple layers of fabric or materials such as cotton, polypropylene, or polyester. Their role is to filter out harmful particles, including viruses, from the air we breathe, similar to how filtration processes work to remove impurities from liquids.
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:
The stepwise procedure for separating each component is given below.
- First we separate potatoes using handpicking process.
- Now we separate salt and sawdust by filtration. Place the mixture containing salt and sawdust in a beaker.
- Add sufficient water to the beaker and stir it well.
- Pour this mixture into the filter paper cone fixed in the funnel by using a glass rod. Water containing salt passes through the filter paper and is collected in a China dish. Sawdust remains on the filter paper. Salt can be obtained from salt solution by heating China dish gently by using a heater.
Question 10.
Read the following story titled ‘Intelligent Leela’ and tick the most appropriate options. Provide a suitable title of your choice of the paragraph.
Answer:
- Appropriate options
- Thirsty/hungry – thirsty
- Water/grains – water
- Fit/unfit – unfit
- Filtered/churned – filtered
- Paper/muslin cloth – muslin cloth
- Cooled/boiled – boiled
- Cooling/boiling – boiling
- Filtered/churned – filtered
- Fit/unfit – fit
Activities
Activity 1.
Aim: To show that blowing air separates the heavier and the lighter components.
Material Required: Roasted peanuts.
Procedure:
- Take a handful of roasted peanuts.
- Rub peanuts between your palms.
- Blow air now.
Observations : Peanut skins are removed.
Conclusion : Blowing air separates the heavier and the lighter components.
Traditionally, a soop (bamboo tray) is used for separating heavier and lighter components of a mixture.
Activity 2.
Aim : To separate common salt from a salt solution.
Materials Required : Common salt, water, a small piece of black or dark coloured thick paper a bowl.
Procedure:
- Take a bowl and fill it half with water.
- Add 2-3 teaspoons of common salt into it and stir till salt dissolves to form a solution.
- Take a small piece of black or dark coloured thick paper and spread a few dropes of its salt solution on it.
- You can also create any art of your choice with this salt solution.
Observations : We observe some patches on its paper.
Conclusion : Common salt is left on the paper water evaporates and goes in air.
Activity 3.
Aim: To recover salt from its solution in water.
Materials Required : China dish, Tripod stand, wire gauze, Burner, salt solution.
Procedure:
- Take some salt solution in a China dish.
- Heat and let its water away bowl away.
- Allow the China dish to cool.
Observations: Common salt is left in China dish.
Conclusion: Common salt can be recovered from its solution by evaporation.
Activity 4.
Aim : To separate clear water from muddy water.
Material Required: Muddy water, funnel, conical flask tripod stand.
Procedure:
- Hold the filter paper and make a cone.
- Place it inside of funnel kept on a conical flask and pour muddy water.
Observations: Mud particles do not pass through the filter paper.
The water coming from the funnel collects in the conical flask. We get mud as a residue on the filter paper and clear water as filtrate in the conical flask. Other than the filter paper, many materials such as cotton charcoal and sand can be used as filters. The choice of filter depends upon the size of particle of the materials to be removed.
Activity 5.
Aim : To design and create working model of water filter using low-cast.
Material Required : A fishing net.
Procedure:
1. Cast the fishing net.
Observations : Water drains out through the mesh.
Conclusion: The method of catching the fish is similar to the filtration method. It can also remove plastic bags, broken bottles, food wrappers along with other fish trapped in the net.
