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CBSE Questions for Class 6 Chemistry Separation Of Substances Quiz 4 - MCQExams.com
CBSE
Class 6 Chemistry
Separation Of Substances
Quiz 4
Winnowing is the method used to separate
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chaff from grain.
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stones from rice.
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oil from water.
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salt from sand.
Explanation
Winnowing is the method used to separate
chaff from grain
.
The methods of separating components of a given mixture are based on the.
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physical properties and state of the components.
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colour of the components only.
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state of the components.
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none of these.
Explanation
Components of a given mixture can be separated on the basis of physical properties and the state of components (like solid, liquid, and gas).
Option
A
is correct.
The constituents of a mixture can only be separated by chemical means.
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True
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False
Explanation
False. The constituents of a mixture can be separated by chemical means and physical means.
Handpicking can be used as a separation technique if the particle size of the constituents of the mixture is the same.
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True
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False
Explanation
False handpicking can be used as a separation technique if the particle size of the constituents of the mixture is not the same. It is usually used to separate impurities that have slightly larger sizes.
A farmer drops the mixture of wheat and husk from a height. The separation is done by which of the following method?
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filtration
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threshing
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sublimation
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winnowing
Explanation
Filtration is a method for separating an insoluble solid from a liquid.
The process that is used to separate the grain from stalks etc. is threshing. In this process, the stalks are beaten to free the grain seeds.
Sublimation is a technique used to separate the components of a mixture containing a sublimable volatile solid and a non-sublimable impurity.
The winnowing method is a process of throwing the grains from a certain height. The light-weighted chaffs are blown apart from the grains by the action of wind.
Therefore, the correct option is
D
.
Stones are separated from pulses by
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hand picking
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winnowing
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vaporization
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none of the above
Explanation
The hand-picking method is used to separate slightly larger size impurities or particles like stones, pieces of dirt, husk from the rice, wheat, etc. This method can be used in all those cases where the shape, size, and color of the substances are different.
Option
A
is correct.
Which of the following is essential to perform winnowing activity.
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Soil
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Water
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Wind
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None of the above
Explanation
Winnowing is the process of separating heavier and lighter components of a mixture by wind or blowing air. Husk and grain are separated by this process. So, to perform winnowing activity wind is necessary.
Hence the correct answer is
C
.
Which method is commonly used to separate salt from water?
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Sedimentation
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Filteration
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Evaporation
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Condensation
Explanation
For the separation of solid dissolved in a liquid, evaporation can be used as a separation technique.
So, the technique used for the separation of salt from its solution is evaporation.
True or False?
A mixture of powdered salt and sugar can be separated by the process of winnowing.
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True
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False
Explanation
Winnowing is useful in separating components of mixtures that vary greatly in their weights. Salt and sugar particles do not vary much in their size or weight. So, they cannot be separated by winnowing.
'Combine' is used in which of the following?
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Threshing
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Handpicking
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Sieving
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Filteration
Explanation
Combine is a machine used to efficiently harvest a variety of crops. Combine is designed to perform three operations i.e reaping, threshing and winnowing.
Which process is used for separating out wheat from impurities?
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Winnowing
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Magnetic separation
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Hand picking
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Threshing
Explanation
The method of handpicking is used to separate undesirable substances such as small pieces from wheat, rice, and pulses. The pieces of stones from grains are picked by hands and thrown away.
Hence, option C is correct.
A very large quantity of mixture contains tiny particles of three different substances X, Y and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and contribute 50% of the mixture. Y particles are very light, insoluble, non-magnetic and contribute 40% of the mixture. And Z particles are actually iron pieces. Which of the following methods can separate X, Y and Z in the fastest manner?
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Winnowing - Magnetic separation
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Magnetic separation-Winnowing
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Sieving-Magnetic separation - Filtration
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Handpicking - Sublimation- Sieving
Explanation
By magnetic separation- It is used to remove particle Z because Z is iron.
Winnowing helps to separate the particle have different weight
It will help to separate
X
,
Y
and
Z
.
How can we sperate a mixture of sugar and sand?
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Dissolution.
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Filtration.
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Evaporation/Distillation.
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Using all of these together.
Explanation
Step 1 is dissolution. Dissolve the mixture of sugar and sand in water.
Step 2 is filtration. The sugar would dissolve in water, the sand won't and hence wouldn't pass through a filter paper.
Step 3 is evaporation/distillation. Let the water of the solution vaporise, by keeping it for some time(evaporation) or heating the solution(distillation), to separate the sugar from water.
Salt can be obtained from sea water by:
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filtration
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winnowing
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evaporation
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decantation
Explanation
When sea water is heated to evaporate the water, salt crystals are left behind. This method is used to obtain salt from sea water, generally using sun's heat.
Which of the following is correctly matched?
(i) No more salt can be dissolved
−
Saturated solution
(ii) Milk and Water can be separated
−
Filtration
(iii) To separate heavier and lighter components
−
Winnowing
(iv) To obtain butter from milk
−
Sieving
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I and III
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II and IV
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I, III and IV
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All of these
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