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Separation of Substances Class 6 MCQs Questions with Answers
Choose the correct option.
Question 1.
Mixtures need to be separated because
(a) to remove undesirable substances
(b) to get desirable substances
(c) to obtain highly pure substances
(d) all of the above
Answer
Answer: (d) all of the above
Question 2.
The method of separation used to separate stones from rice is
(a) handpicking
(b) threshing
(c) winnowing
(d) all of these
Answer
Answer: (a) handpicking
Question 3.
Butter is separated from milk by
(a) sedimentation
(b) filtration
(c) churning
(d) decantation
Answer
Answer: (c) churning
Question 4.
The separation of grains from husk is done by the process of
(a) handpicking
(b) sieving
(c) winnowing
(d) threshing
Answer
Answer: (c) winnowing
Question 5.
Threshing is done by
(a) beating
(b) animals
(c) machines
(d) all of these
Answer
Answer: (d) all of these
Question 6.
Filtration is a method to separate the components of a
(a) solution
(b) mixture of a liquid and an insoluble substance
(c) both (a) & (b)
(d) pure substance
Answer
Answer: (b) mixture of a liquid and an insoluble substance
Question 7.
A solid is dissolved in water. Which one of the following methods can be used to separate it?
(a) Filtration
(b) Decantation
(c) Distillation
(d) Evaporation
Answer
Answer: (d) Evaporation
Question 8.
Petroleum contains
(a) petrol
(b) methanol
(c) oil
(d) water
Answer
Answer: (a) petrol
Question 9.
Which of the following method is used when there is a difference in size and colour of desirable and undesirable constituents?
(a) Handpicking
(b) Threshing
(c) Filtration
(d) Decantation
Answer
Answer: (a) Handpicking
Question 10.
The components of a solution of sugar in water can be separated by
(a) filtration
(b) crystallisation
(c) decantation
(d) sedimentation
Answer
Answer: (b) crystallisation
Question 11.
At water treatment plants, the river water is filtered by using
(a) filter paper
(b) porcelain filters
(c) cloth filters
(d) sand filters
Answer
Answer: (d) sand filters
Question 12.
The process of separating grains from the stalks is called
(a) handpicking
(b) threshing
(c) decantation
(d) evaporation
Answer
Answer: (b) threshing
Question 13.
Iodine can be recovered from tincture of iodine by the process of
(a) filtration
(b) distillation
(c) evaporation
(d) decantation
Answer
Answer: (c) evaporation
Question 14.
A mesh which is used to separate things on the basis of their difference in size
(a) sieve
(b) thresher
(c) filter paper
(d) none of these
Answer
Answer: (a) sieve
Question 15.
The process of conversion of water into vapour is called
(a) condensation
(b) evaporation
(c) sedimentation
(d) decantation
Answer
Answer: (b) evaporation
Question 16.
The process of separation of tea leaves by strainer is called
(a) filtration
(b) sedimentation
(c) evaporation
(d) condensation
Answer
Answer: (a) filtration
Question 17.
Which of the following mixtures cannot be separated by using water as solvent followed by filtration and evaporation?
(a) Sand and sugar
(b) Salt and chalk powder
(c) Sand and sulphur
(d) Blue vitriol and sand
Answer
Answer: (c) Sand and sulphur
Question 18.
The property which forms the basis of sieving is
(a) difference in weight
(b) difference in colour
(c) difference in shape
(d) difference in size
Answer
Answer: (d) difference in size
Question 19.
When no more salt dissolves in water at a particular temperature, then the solution at that temperature is called
(a) unsaturated
(b) saturated
(c) supersaturated
(d) none of these
Answer
Answer: (b) saturated
Question 20.
The separation of insoluble solids from liquids can be done by
(a) sedimentation
(b) decantation
(c) loading
(d) all of these
Answer
Answer: (a) sedimentation
Question 21.
An example of a heterogeneous mixture is
(a) fresh air
(b) fresh water
(c) sugar solution
(d) dirty water
Answer
Answer: (d) dirty water
Question 22.
………….. is a convenient method of separation.
(a) Handpicking
(b) Threshing
(c) Winnowing
(d) Sieving
Answer
Answer: (a) Handpicking
Question 23.
Thresher machines are also used to thresh large quantities of ……………..
(a) grain
(b) sugar
(c) salt
(d) sand
Answer
Answer: (a) grain
Question 24.
A separation funnel is a ……….. bulb to the stem of which is fitted a stopcock.
(a) wooden
(b) copper
(c) glass
(d) steel
Answer
Answer: (c) glass
Question 25.
Distillation is a method of obtaining pure …………….. from a solution.
(a) liquid
(b) solid
(c) gas
(d) all of them
Answer
Answer: (a) liquid
Question 26.
Water present in …………… is in the form of water vapour.
(a) soil
(b) moist
(c) air
(d) dry
Answer
Answer: (c) air
Question 27.
Common salt is recovered from sea water by the process of
(a) filtration
(b) evaporation
(c) sublimation
(d) decantation
Answer
Answer: (b) evaporation
Question 28.
When no more salt dissolves in water at a particular temperature, then the solution at that temperature is called
(a) unsaturated
(b) saturated
(c) super saturated
(d) none of the above
Answer
Answer: (b) saturated
Question 29.
The process of conversion of water into vapour is called
(a) evaporation
(b) condensation
(c) sedimentation
(d) decantation
Answer
Answer: (a) evaporation
Question 30.
Tincture of iodine is a weak solution of iodine in alcohol. Iodine can be recovered from tincture of iodine by the process of
(a) filtration
(b) distillation
(c) evaporation
(d) decantation
Answer
Answer: (b) distillation
Fill in the Blanks
Question 1.
Milk is a mixture of ……………., ……………. and …………….
Answer
Answer: milk-proteins, water, cream
Question 2.
……………. substance contains particles of only one type.
Answer
Answer: Pure
Question 3.
……………. and ……………. are the types of mixtures.
Answer
Answer: Heterogeneous, homogeneous
Question 4.
Pebbles can be separated from wheat by …………….
Answer
Answer: handpicking
Question 5.
……………. is used to separate husk from wheat.
Answer
Answer: Winnowing
Question 6.
Glass is a …………….
Answer
Answer: mixture
Question 7.
Common salt is obtained from sea water by …………….
Answer
Answer: evaporation
Question 8.
Compounds have ……………. melting points.
Answer
Answer: fixed
Question 9.
Cream is separated from milk by the process of …………….
Answer
Answer: churning
Question 10.
The method used to separate the components of different sizes in a mixture using a sieve is called …………….
Answer
Answer: sieving
Question 11.
The process of separating grains from the stalks is called …………….
Answer
Answer: Threshing
Question 12.
Fine sand can be separated from larger particles by …………….
Answer
Answer: sieving
Question 13.
Breaking of stalks from grains is done by a machine called …………….
Answer
Answer: threshers
Question 14.
Butter is a component of …………….
Answer
Answer: buttermilk
Question 15.
Mixture may be solid, liquid or …………….
Answer
Answer: gas
Question 16.
……………. is used for separating insoluble substances from a liquid.
Answer
Answer: Filtration
Question 17.
Sedimentation can be done more quickly by adding ……………. into it.
Answer
Answer: alum
Question 18.
The used tea-leaves are separated from tea by the method of …………….
Answer
Answer: filtration
Question 19.
The changing of liquid into vapours is called …………….
Answer
Answer: evaporation
Question 20.
Components retain their properties in a …………….
Answer
Answer: mixture
Question 21.
Peanuts can be separated from a mixture of wheat and peanuts by ………………
Answer
Answer: handpicking
Question 22.
Fine sand can be separated from larger particles by ………………
Answer
Answer: sieving
Question 23.
Compounds have ……………… melting points.
Answer
Answer: fixed
Question 24.
Mixture may be solid, liquid or ………………
Answer
Answer: gas
Question 25.
Butter is a component of ………………
Answer
Answer: milk
Question 26.
Sugarcane juice is a mixture of ……………… water and many other substances.
Answer
Answer: sugar
Question 27.
Separation of components is done to obtain a ……………… substance.
Answer
Answer: pure
Question 28.
Components retain their properties in a ………………
Answer
Answer: mixture
Question 29.
The solid left behind after filtration is called ………………
Answer
Answer: residue
Question 30.
The component dissolved in a solvent is called ………………
Answer
Answer: solute
True or False
Question 1.
Milk is a pure substance.
Answer
Answer: False
Question 2.
Evaporation is a continuous process.
Answer
Answer: True
Question 3.
Air is a mixture of gases.
Answer
Answer: True
Question 4.
Filtration can remove any solid substance which are dissolved in a liquid.
Answer
Answer: False
Question 5.
A mixture of chalk powder and water is separated by sieving.
Answer
Answer: False
Question 6.
A mixture of oil and water can be separated by decantation.
Answer
Answer: True
Question 7.
Rocks are pure substances.
Answer
Answer: False
Question 8.
Ink loses its properties when mixed in water.
Answer
Answer: False
Question 9.
Common salt is a pure substance.
Answer
Answer: True
Question 10.
Loading helps the suspended clay particles to settle down.
Answer
Answer: True
Question 11.
Separating a mixture of two solids by winnowing is based on the difference in their weights.
Answer
Answer: True
Question 12.
When no more solute can be dissolved in a given amount of solvent at a particular temperature, the solution is said to be unsaturated.
Answer
Answer: True
Question 13.
Grain and husk can be separated by decantation.
Answer
Answer: False
Question 14.
Handpicking can be used to separate pulses from a mixture of pulsed and pebbles in a plate.
Answer
Answer: True
Question 15.
Lemonade is a homogeneous mixture.
Answer
Answer: True
Question 16.
There are a number of useful minerals present in sea water.
Answer
Answer: True
Question 17.
The tap water is completely pure and fit for drinking.
Answer
Answer: False
Question 18.
When a mixture consists of heavier and lighter particles, the lighter particles are separated using winnowing.
Answer
Answer: True
Question 19.
Winnowing and threshing are same processes.
Answer
Answer: False
Question 20.
Decantation is generally preceded by sedimentation.
Answer
Answer: True
Match the following
| Column I | Column II |
| 1. Purification of water | (a) Threshing |
| 2. Separating butter from curd | (b) Alum |
| 3. Separation of grains from stalks | (c) Churning |
| 4. Separating larger size impurities | (d) Evaporation |
| 5. Separation by wind | (e) Handpicking |
| 6. Separation of common salt from water solution | (f) Winnowing |
| 7. Separating iron particles from dust | (g) Sedimentation |
| 8. Separating bran from flour | (h) Magnet |
| 9. Conversion of water into liquids | (i) Sieving |
| 10. Setting of heavier components at bottom | (j) Condensation |
Answer
Answer:
| Column I | Column II |
| 1. Purification of water | (b) Alum |
| 2. Separating butter from curd | (c) Churning |
| 3. Separation of grains from stalks | (a) Threshing |
| 4. Separating larger size impurities | (e) Handpicking |
| 5. Separation by wind | (f) Winnowing |
| 6. Separation of common salt from water solution | (d) Evaporation |
| 7. Separating iron particles from dust | (h) Magnet |
| 8. Separating bran from flour | (i) Sieving |
| 9. Conversion of water into liquids | (j) Condensation |
| 10. Setting of heavier components at bottom | (g) Sedimentation |
| Column A | Column B |
| 1. Handpicking | (a) Separating bran from flour |
| 2. Threshing | (b) Separating larger size impurities |
| 3. Winnowing | (c) Separating grains from its stalks |
| 4. Sieving | (d) Settling of heavier components at bottom |
| 5. Sedimentation | (e) Separation by wind or by blowing air |
Answer
Answer:
| Column A | Column B |
| 1. Handpicking | (b) Separating larger size impurities |
| 2. Threshing | (c) Separating grains from its stalks |
| 3. Winnowing | (e) Separation by wind or by blowing air |
| 4. Sieving | (a) Separating bran from flour |
| 5. Sedimentation | (d) Settling of heavier components at bottom |
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