Questions & answers for Chapter 5 Separation of substances

Chapter 5 Separation of substances Questions and Answers for class 6 Science

Find below Important MCQ-based objective questions for Chapter 5 Separation of substances prepared for CBSE students. All the syllabus of Class 6 Science Chapter 5 Separation of substances is covered with questions and answers. Each question is explained with a detailed solution. The entire syllabus of Chapter 5 Separation of substances is covered in the following worksheet for class 6 science. For more worksheets for class 6 science click on the link and do check out NCERT solutions for class 6 science. 

Find below Class 6 Science Chapter 5 Separation of substances Questions & Answer

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Class 6 Science Chapter 5 Separation of substances Questions & Answer Set-1

Science - MCQ on Separation of Substances

Class VI

Q.1.Which of the following is a mixture? (1 Mark)

a. Diamond

b. Iron fillings

c. Copper

d. Air

Answer:

(D) Air

Explanation – Air is a mixture of gases like nitrogen, oxygen, carbondioxide, dust particles etc.

Q.2.A mixture of corn and husk is separated by - (1 Mark)

a. Handpicking

b. Winnowing

c. Sieving

d. Sublimation

Answer:

(B) Winnowing

Explanation- Winnowing is used when the grains are heavier than husk and hay.
Corn is heavier than husk.

Q.3.The purity of a substance is determined by – (1 Mark)

a. its colour

b. source

c. m.p. and b.p.

d. quantity

Answer:

(D) m.p. and b.p.

Explanation- The m.p. and b.p. of a pure substance is always fixed. Due to impurity in a substance, it may increase or decrease.

Q.4.Most materials which occur in nature are – (1 Mark)

a. pure elements

b. pure compounds

c. mixtures

d. none of these

Answer:

(C) mixtures

Explanation- Most materials which occur in nature are mixtures of two or more substances. e.g. natural water, soil, air etc. are mixtures.

Q.5.The various substances present in a mixture are called – (1 Mark)

a. elements

b. compounds

c. atoms

d. components

Answer:

(D) components

Explanation- The various substances present in a mixture are known as components or constituents.e.g. In a mixture of sugar and sand, sugar and sand are the components of the mixture.

Q.6.The process of settling down of the particles of a solid in a liquid is – (1Mark)

a. sublimation

b. sedimentation

c. decantation

d. filtration

Answer:

(B) Sedimentation

Explanation- The settling down of the heavier particles to the bottom of the container in a liquid is known as Sedimentation.

Q.7. A solid substance is dissolved in water. Which of the following methods is used for separating it? (1 Mark)

a. Evaporation

b. Distillation

c. Filtration’

d. Decantation

Answer:

(A) Evaporation

Explanation- The process of separating a solid substance from its solution by removing the liquid is called evaporation. This process can be made quicker by heating the solution. e.g. common salt is obtained from sea water by evaporation.

Q.8. Find the odd one out – (1 Mark)

a. Iodine

b. Camphor

c. Naphthalene

d. Sugar

Answer:

(D)Sugar

Explanation- Iodine, camphor and naphthalene can sublime but sugar cannot sublime.

Q.9.The components of brass are – (1 Mark)

a. copper and zinc

b. copper and iron

c. carbon, hydrogen and oxygen

d. carbon and sulphur

Answer:

(A) copper and zinc

Explanation- Brass is made of copper and zinc. It is an alloy i.e. made of two metals (or metal and a non-metal).

Q.10.The process in which a solid directly changes to gaseous state on heating is known as – (1 Mark)

a. Evaporation

b. Filtration

c. Sublimation

d. Distillation

Answer:

(C) Sublimation

Explanation- Sublimation is a process in which a solid directly changes into its vapours (gaseous state) on heating e.g. ammonium chloride, camphor etc.

Q.11.Which of the following is a false statement? (1 Mark)

a. Cream from milk is separated by centrifugation process.

b. Iron is a magnetic substance.

c. Pond water is a heterogeneous mixture.

d. Sharbat is a pure substance.

Answer:

(D) Sharbat is a pure substance.

Explanation- Sharbat is not a pure substance as it consists of sugar, water and fruit juice which has not a definite composition.

Q.12.Loading is done by using (1Mark)

a. chalk

b. stone

c. alum

d. sugar

Answer:

(C) alum

Explanation- Loading is a process of settling down solid particles quickly. The fine particles of the solid like clay can be made to settle faster by dissolving a small quantity of alum in muddy water. The process is called loading. On adding alum to muddy water, the fine particles get loaded with alum particles and form larger aggregates. This makes them to settle down faster.

Class 6 Science Chapter 5 Separation of substances Questions & Answer Set-2

Q.13.The process to separate two immiscible liquids is – (1Mark)

a. sedimentation

b. evaporation

c. distillation

d. decantation process by separating funnel

Answer:

(D) decantation process by separating funnel

Explanation- The liquids which do not dissolve in each other are called immiscible liquids. Immiscible liquids can be separated from each other by a separating funnel. The lighter liquid forms the upper layer and heavier forms the lower layer.

Q.14.A mixture of sand and iron fillings can be separated by – (1 Mark)

a. magnetic separation

b. hand picking

c. winnowing

d. sieving

Answer:

(A) magnetic separation

Explanation- Iron is a magnetic material. So it can be separated from the mixture of sand and iron fillings by a magnet.

Q.15.Distillation is used for – (1 Mark)

a. separating two miscible liquids having different boiling points.

b. purifying a liquid by removing soluble and insoluble impurities.

c. both (A) and (B)

d. none of these

Answer:

(C) both (A) and (B)

Explanation- Two liquids having different boiling points can be separated by distillation. Purification of a liquid is also done by distillation.

Q.16.The property which forms the basis of sieving is – (1 Mark)

a. difference in weight

b. difference in size

c. difference in shape

d. difference in colour

Answer:

(B) difference in size

Explanation- Sieving is used for separating solid constituents of a mixture which differ in their sizes.

Q.17. A mixture of ammonium chloride, common salt and iron fillings can be separated by – (1 Mark)

a. magnetic separation

b. sublimation

c. by the combination of (A) and (B)

d. none of these

Answer:

(C) by the combination of (A) and (B)

Explanation- Iron fillings are removed by magnetic separation. Ammonium chloride is separated by sublimation (as sublimate) and sand is left as residue.

Q.18.Which of the following is a true statement? (1 Mark)

a. Different substances form crystals of different shapes and colours.

b. Aluminium is a magnetic substance.

c. Butter is separated from milk by crystallization.

d. Distilled water is obtained by filtration.

Answer:

(A) Different substances form crystals of different shapes and colours.

Explanation- Each crystalline substance has its specific crystals of specific shape and colour e.g. blue vitriol and alum have different shapes and colours of crystals.

Q.19. Find the odd one out – (1 Mark)

a. Iron

b. Copper

c. Silver

d. Aluminium

Answer:

(A) Iron

Explanation- Iron is a magnetic material while others are non-magnetic materials.

Q.20.The separation of the constituents of a mixture is done to – (1Mark)

a. remove harmful and unwanted constituents.

b. obtain pure sample of a substance.

c. obtain useful constituents.

d. all are correct.

Answer:

(D) all are correct.

Explanation- The purpose of separating the constituents of a mixture is to remove harmful and unwanted constituents and to obtain useful and pure constituents.

Q.21.The process of conversion of water vapour into its liquid form on cooling is known as – (1 Mark)

a. evaporation

b. condensation

c. distillation

d. decantation

Answer:

(B) condensation

Explanation- Condensation is the process in which vapours of a liquid are converted into liquid on cooling.

Q.22.A _______ is used for separating insoluble solid particles from a liquid

a. a piece of muslin cloth

b. filter paper

c. both (A) and (B)

d. none of these (1Mark)

Answer:

(C) both (A) and (B)

Explanation- Insoluble solid particles are separated from a liquid by filtration using filter paper or a piece of muslin cloth.

Q.23.Match the items of column `A’ with the items of column `B’

Column A	Column B
I Solution	a. Threshing
II Sublimation	b. centrifugation
III cream from milk	c.
IV grains from stalks	(d) a homogeneous mixture

a. I – b, II– d, III – a, IV – c

b. I – a, II – c, III – b, IV – d

c. I – b, II – d, III – c, IV – a

d. I – d, II – c, III – b, IV – a (1 Mark)

Answer:

(D) I -d, II – c, III – b, IV- a

Explanation- Solution is a homogeneous mixture. In sublimation, solid is directly converted into vapours on heating and vapours are directly converted into solid on cooling. Cream is separated from milk by centrifugation and grains from stalks are separated by threshing.

Q.24. Conversion of a liquid into vapours is called – (1 Mark)

a. evaporation

b. centrifugation

c. condensation

d. decantation

Answer:

(A) evaporation

Explanation- Evaporation is a process in which a liquid is converted into its vapours. This process can be made quicker by heating the liquid.

Q.25.A solution in which no more solute (substance) can be dissolved at that temperature is known as – (1 Mark)

a. unsaturated solution

b. saturated solution

c. colloid

d. none of these

Answer:

(B) saturated solution

Explanation- A saturated solution is the solution which cannot dissolve more of the substance at that temperature.