Chapter 9. Methods of Separation in Everyday Life Class 6 Science Curiosity Solutions English Medium-NCERT TextBookn Questions With Answers

NCERT Solutions Class 6 Science Curiosity English Medium

Chapter 9. Methods of Separation in Everyday Life

Topic: NCERT TextBookn Questions With Answers

Chapter 9. Methods of Separation in Everyday Life

NCERT Textbook Exercise

The following solutions are prepared according to the latest NCERT Curiosity (Class 6 Science) textbook. The answers are written in simple English, keeping the CBSE pattern in mind to help students understand the concepts clearly and perform well in examinations.

Question 1. What purpose does handpicking serve in the process of separation?

Options:

(i) Filtration

(ii) Sorting

(iii) Evaporation

(iv) Decantation

Answer: (ii) Sorting

Explanation: Handpicking is used to remove unwanted solid particles such as stones or husk from grains by picking them with the hand.

Question 2. Which of the following substances are commonly separated using the churning method?

Options:

(i) Oil from water

(ii) Sand from water

(iii) Cream from milk

(iv) Oxygen from air

Answer: (iii) Cream from milk

Explanation: Churning is commonly used to separate butter or cream from curd or milk.

Question 3. Which factor is usually essential for filtration?

Options:

(i) Apparatus size

(ii) Presence of air

(iii) Pore size

(iv) Temperature of the mixture

Answer: (iii) Pore size

Explanation: A filter works because its pores allow the liquid to pass while trapping insoluble solid particles.

Question 4. State with reason whether the following statements are True or False. Correct the false statements.

(i) Salt can be separated from salt solution by keeping it under the Sun.

Answer: True.

Reason: Water evaporates in sunlight, leaving salt behind.

(ii) Handpicking should be used only when the quantity of one component is less.

Answer: True.

Reason: Handpicking is suitable only when the unwanted particles are present in small amounts and are easily visible.

(iii) A mixture of puffed rice and rice grains can be separated by threshing.

Answer: False.

Correct Statement: A mixture of puffed rice and rice grains can be separated by handpicking or winnowing, not by threshing.

(iv) A mixture of mustard oil and lemon water can be separated by decantation.

Answer: True.

Reason: Oil and water do not mix. After settling, the upper oil layer can be separated by decantation.

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

Answer: False.

Correct Statement: Sieving is used to separate solid particles of different sizes. Rice flour mixed with water cannot be separated by sieving.

Question 5. Match the mixtures in Column I with the correct method of separation in Column II.

Question 6. In what situations would you use decantation instead of filtration to separate solids from liquids?

Answer:

Decantation is used when the solid particles are heavy and settle at the bottom after keeping the mixture undisturbed for some time. The clear liquid is then poured carefully into another container. It is commonly used for separating muddy water or washing rice and pulses.

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

Answer:

Yes. Nasal hair acts like a natural filter. It traps dust, pollen, and other harmful particles present in the air before they enter our lungs. This process is similar to filtration.

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:

Most masks are made of multiple layers of non-woven fabric or special filtering material.

The masks:

• Filter dust, germs, and tiny droplets.
• Reduce the spread of viruses and bacteria.
• Protect both the wearer and nearby people from infections.

Explanation: Like a filter paper, the mask allows air to pass while trapping harmful particles.

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