CBSE Class 6 Science Separation Of Substances Worksheet Set C

Match the Column

DIRECTIONS : Match Column-I with Column-II and select the correct answer using the codes given below the columns.

Question. 

(a) A → (p), B →(q), C→ (r), D → (s)
(b) A → (s), B →(r), C→ (q), D → (p)
(c) A → (r), B →(s), C→ (p), D → (s)
(d) A → (q), B →(s), C→ (p), D → (r)
Answer : B

Question. 

(a) A → (r), B →(s), C→ (q), D → (p)
(b) A → (q), B →(r), C→ (p), D → (q)
(c) A → (p), B →(q), C→ (r), D → (s)
(d) A → (s), B →(r), C→ (q), D → (p)
Answer : A

Passage Based Questions

DIRECTIONS : Read the passage(s) given below and answer the questions that follow.

Passage-1
You are provided with a thoroughly grinded mixture consisting of dry sand and powdered dry leaves.
You are asked to separate the components of this mixture either by using the process of winnowing or by any other process.

Question. Which other process would you use to separate the components of this mixture?
(a) Threshing
(b) Hand picking
(c) Filtration
(d) None of these
Answer : D

Question. Winnowing is based on which property of component of a mixture?
(a) Difference in size
(b) Difference in weight
(c) Difference in shape
(d) Difference in colour
Answer : B

Question. Which component of the mixture will fall near the platform used for winnowing?
(a) Sand
(b) Dried leaves
(c) Both of these
(d) None of these
Answer : A

Passage-2
You are asked to add two spoons of solid salt to some liquid water taken in a beaker.
On stirring it you find that whole of the salt has disappeared and only liquid can be seen in beaker.

Question. After stirring the salt completely disappears and you can see only liquid in the beaker. The liquid in beaker is
(a) water
(b) solution
(c) solute
(d) solvent
Answer : B

Question. Which of the following processes will be useful to get salt from this solution?
(a) Condensation
(b) Evaporation
(c) Filtration
(d) Sedimentation
Answer : B

Question. Which process can you use to get liquid water from the water vapours if you collect them in another container?
(a) Sedimentation
(b) Condensation
(c) Evaporation
(d) Filtration
Answer : B

Assertion/ Reason Based Questions

DIRECTIONS : The questions in this segment consists of two statements, one labelled as “Assertion A” and the other labelled as “Reason R”. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select one of the current options (a), (b), (c) and (d) given below in each questions.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question. Assertion (A) : The process of settling of heavier insoluble particles from a suspension of a substance in water known as decantation.
Reason (R) : This process along with sedimentation is used to get clear water from muddy water.
Answer : C

Question. Assertion (A) : The process of conversion of liquid water to its vapours by heating the liquid is called evaporation.
Reason (R) : The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
Answer : B

Statement Based Questions

Directions : Read the following two statements carefully and choose the correct option.
(a) Statement (i) is correct while statement (ii) is incorrect.
(b) Statement (ii) is correct while statement (i) is incorrect.
(c) Both statements are correct.
(d) Both statements are incorrect.

Question. (i) A mixture of sand and salt is partly soluble in water.
(ii) The process of threshing is used to separate grains from stalks.
Answer : C

Question. (i) If the solid dissolve in liquid, then decantation process can be used to separate them.
(ii) Oil and water solution can be separated by decantation.
Answer : B

Question. (i) A solution that is capable of dissolving more of solute at the given temperature is known as saturated solution.
(ii) A saturated solution on heating becomes unsaturated solution.
Answer : B

Figure Based Questions

Question. The apparatus shown in picture below is used in the process of filteration. Name of this apparatus is

(a) separating funnel
(b) connical flask
(c) filter funnel
(d) stirrer
Answer : C

Question. The diagram shows which process of separation?

(a) Sedimentation
(b) Decantation
(c) Filtration
(d) Distillation
Answer : B

Question. A solution is given which is prepared by adding sugar crystals to water. The solution as shown in diagram is

(a) a saturated solution
(b) an unsaturated solution
(c) a clear solution
(d) a suspension
Answer : A

Question. Which two methods of separation are shown in Fig. I and Fig. II?

(a) Fig. I → Evaporation, Fig II → Decantation
(b) Fig. I → Sedimentation, Fig II → Decantation
(c) Fig. I → Decantation, Fig II → Filtration
(d) Fig. I → Decantation, Fig II → Evaporation
Answer : D

1. Why do we need to separate the different components of a mixture?

2. Fill in the blanks:

a) ____________ and _______________ can be used for separating insoluble solid from a liquid.

b) ________________ is used to separate stones and pebbles.

c) Grains and husk can be separated using ________________.

3. What is threshing? Discuss two ways in which threshing is commonly done.

4. What is winnowing? How is it done?

5. What is hand picking?

6. Define a saturated solution. How would you make a saturated solution?

7. Describe briefly how salt is collected from sea water.

8. Name the method which can be used to separate fine suspended matter from liquids.

9. Explain the term : Magnetic separation.

10. State true or false:

a) Crystals are formed when a saturated solution is heated.

b) The conversion of water vapour into liquid water by cooling is known as condensation.

c) Small stone chips can be removed from rice by sieving.

11. How is scrap iron separated from a heap of waste materials in factories?

12. How will you obtain clear water from a sample of muddy water?

13. Name the process by which water is separated from rice and pulses after washing them.

14. How will you separate a mixture of sugar and sand?

15.Which of the two will dissolve more sugar: cold water or warm water? Why?