NCERT Class VI Science Solutions: Chapter 5 – Separation of Substances Part 3

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Question 12:

Fill in the blanks with appropriate words:

1. Small pieces of stone can be removed from rice by __________.

2. _________ are obtained from stalks by threshing.

3. Husk from wheat flour is generally removed by __________.

4. The process of settling of heavier particles is called __________.

5. Filtration is helpful in separating an insoluble __________ from a __________.

Answer:

1. Small pieces of stone can be removed from rice by hand picking.

2. Grains are obtained from stalks by threshing.

3. Husk from wheat flour is generally removed by sieving.

4. The process of settling of heavier particles is called sedimentation.

5. Filtration is helpful in separating an insoluble solid from a liquid.

Question 13:

State whether the following statements are true or false.

1. A mixture of oil and water can be separated by filtration.

2. Water can be separated from salt by evaporation.

3. A mixture of wheat grains and wheat flour can be separated by sieving.

4. A mixture of iron filings and rice flour can be separated by magnet.

5. A mixture of wheat grains and rice flakes can be separated by winnowing.

6. A mixture of tea leaves and milk can be separated by decantation.

Answer:

1. A mixture of oil and water can be separated by filtration. (False, A mixture of oil and water can be separated by decantation)

2. Water can be separated from salt by evaporation. (True)

3. A mixture of wheat grains and wheat flour can be separated by sieving. (True)

4. A mixture of iron filings and rice flour can be separated by magnet. (True)

5. A mixture of wheat grains and rice flakes can be separated by winnowing. (True)

6. A mixture of tea leaves and milk can be separated by decantation. (True)

SHORT ANSWER QUESTIONS

Question 14:

Name and describe briefly a method which can be helpful in separating a mixture of husk from grains. What is the principle of this method?

Answer:

Hint: Winnowing. This method is based on the principle that the lighter particles are carried away by the wind.

This method is based on the fact that husk is very light whereas wheat grains are comparatively heavy. The mixture is allowed to fall from a height by shaking winnowing basket continuously. The husk particles are carried away by the wind to a greater distance. The wheat grains, being heavy, fall down vertically to the ground and form a heap of wheat grains.

Question 15:

Match the mixtures in Column I with their method of separation in Column II.

Answer: