Separation & Its Need

Q.

14 Give one example of sieving used in everyday life.

Q.

You are provided with a mixture of petroleum and water. Suggest a method to separate the two.

Q.

Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?

Q.

Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?

1. Hand-picking

2. Winnowing

3. Sieving

4. Threshing

Q.

66 Husk from wheat flour is generally removed by ……….

Q.

Diamond, silicon carbide and silica can be used as abrasives. How do you account for the above said property?

Q.

To separate a mixture of solid particles of the same material into lots of different sizes, the best method would be_________

Q. How many of the given substances are soluble in water?
Substances: Sugar, petrol, salt, vinegar, sand, oil

1. 3

Q.

Sieving is used to separate a mixture when all the constituents are solids of the same size.

1. True
2. False

Q.

90 How is finely sand separated from larger particles? Explain.

Q.

Draw a labelled diagram to show the separation of sawdust from water.

Q. Find the odd one out from each of the following groups based on the given properties:
a) Iron, Wood, Cotton: Hardness
b) Knife, Hammer, Spoon, Fork: Use
c) Oil, Sugar, Salt, Carbon dioxide: Solubility in water

1. a: Wood, b: Fork, c: Oil
2. a: Iron, b: Fork, c: Carbon dioxide
3. a: Cotton, b: Hammer, c: Oil
4. a: Cotton, b: Hammer, c: Carbon dioxide

Q.

The process that can be used to separate a mixture of iron and sulphur is ______ separation.

Q.

Filtration is the best method of separating an insoluble solid component as compared to decantation.

Q.

14 (c). Mention the property on which the separation of the following mixtures would be based: a mixture of flour and raisins

Q.

Is It Possible To Separate Sugar Mixed With Wheat Flour?

Q.

6 Give the name of the impurities present in flour.

Q.

16 A method is used to separate the components of a mixture that are of different sizes. Name it.

Q.

7 Can sieving separate the same size particles?

Q.

The substances which dissolve very little are called soluble substances.

1. True
2. False

Q. Which of the following objects can be used for separation?

1. Sieve
2. Filter paper
3. Cloth
4. Glass rod

Q.

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

1. True
2. False

Q.

Objects that allow light to pass through them partially are known as …………………….. objects.

Q.

Which separation technique will you apply for the separation of the following mixture?

Fine mud particles floating in water

Q.

Choose the odd one from the list given below:

1. Water cycle

2. Clouds

3. Rain

4. Sedimentation

Q. While preparing chapatis, Paheli found that the flour to be used was mixed with wheat grains. What is the most suitable method to separate the grains from the flour? [3 marks]

Q. A solution which cannot dissolve its solute anymore at a specific temperature is called a/an ____ solution.

1. pure
2. supersaturated
3. unsaturated
4. saturated

Q. Separation is done to filter out only the unwanted substances.

1. False
2. True

Q.

___________ is used to separate particles of different sizes from a mixture.

Q. Matter is classified into pure substances and mixtures.

1. False
2. True