NCERT Solutions: Methods of Separation in Everyday Life-Class 6-Science

Chapter-Methods of Separation in Everyday Life

Class - 6
Subject-Science

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1. What purpose does handpicking serve in

the process of separation?

(i) Filtration              

(ii) Sorting

(iii) Evaporation       

(iv) Decantation

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

3. Which factor is usually essential for the filtration?

(i) Apparatus size               

(ii) Presence of air

(iii) Pore size                     

(iv) Temperature of the mixture

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. [ True ]

(ii) Handpicking should be used only when the quantity

of one component is less. [ True ]

(iii) A mixture of puffed rice and rice grains can be

separated by threshing. [ False ]

(iv) A mixture of mustard oil and lemon water can be

separated by decantation. [ True ]

(v) Sieving is used to separate a mixture of rice flour

and water. [ False ]

5. Match the mixtures with their method of separation:

Column-I	Column-II
(i) Gram flour mixed with black gram	(a) Handpicking
(ii) Chalk powder mixed with water	(b) Magnetic separation
(iii) Corn mixed with potatoes	(c) Decantation
(iv) Iron powder mixed with sawdust	(d) Sieving
(v) Oil mixed with water	(e) Filtration

Use decantation when:
Nasal hair works like a filter to trap dust and harmful particles from the air we breathe.
Masks are made of fabric or non-woven material like cotton or polypropylene.Role: They act as filters, blocking dust, germs, and viruses from entering the body.
Step 1: Handpick the potatoes.
Title: "Leela’s Smart Solution"

Answer: (i)-d, (ii)-e, (iii)-a, (iv)-b, (v)-c

6. In what situations would you use decantation instead of filtration to

separate solids from liquids?

Answer:

When to use decantation instead of filtration?

The solid settles at the bottom.The liquid can be poured off without needing fine filtration. Example: separating oil from water.

7. Can you relate the presence of nasal hair to any separation process?

Answer: 

Nasal hair as a separation process:

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: 

Materials and role of masks during COVID-19:

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: 

 Stepwise procedure to separate potatoes, salt, and sawdust:

Step 2: Add water to dissolve the salt.

Step 3: Filter the mixture to remove sawdust.

Step 4: Evaporate the water to get back the salt.

10. Read the following 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/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:

Story of ‘Intelligent Leela’:

Leela separated muddy water by sedimentation and filtration, then boiled it to make

it fit for drinking.

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