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All questions of Methods of Separation in Everyday Life for Class 6 Exam

Which of the following statements about a mixture is TRUE?
  • a)
    It is a pure substance.
  • b)
    Its constituents are not combined chemically.
  • c)
    Its constituents do not retain their individual properties.
  • d)
    It is always homogeneous.
Correct answer is option 'B'. Can you explain this answer?

Upasana Basak answered
In a mixture, the constituent substances are mixed only physically but not combined chemically. A mixture is not a pure substance as its constituents retain their properties. So, a mixture can be either homogeneous or heterogeneous.
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X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?
  • a)
    Sieving
  • b)
    Handpicking
  • c)
    Threshing
  • d)
    Winnowing
Correct answer is option 'D'. Can you explain this answer?

Anjana Rane answered
Correct Answer: D
Solution :
X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components

The following flow chart which gives the techniques a student adopted to separate the constituents of a mixture. 

What could R be?
  • a)
    Sugar
  • b)
    Chalk powder
  • c)
    Glass
  • d)
    Oxygen
Correct answer is option 'A'. Can you explain this answer?

Amrita Roy answered
The correct answer is A: Sugar.

- The separation technique shown is crystallization, used to separate solids from a solution.
- Sugar can be separated from a sugar-water solution through crystallization.
- In this process, the sugar is dissolved in water, heated to dissolve more sugar, then cooled to allow sugar crystals to form and separate.
- Chalk powder, glass, and oxygen cannot be separated using crystallization.
R should be a substance which is soluble in water i.e., sugar.

What technique involves using a sieve to separate particles of different sizes?
  • a)
    Sieving
  • b)
    Filtration
  • c)
    Winnowing
  • d)
    Churning
Correct answer is option 'A'. Can you explain this answer?

Ashwini Chauhan answered
Understanding Sieving
Sieving is a physical separation technique widely used to separate particles based on size. It is particularly effective in various applications, including cooking, construction, and laboratory settings.

How Sieving Works
- A sieve consists of a mesh or perforated material that allows smaller particles to pass through while retaining larger ones.
- When a mixture is poured onto the sieve, the larger particles remain on the surface, while the smaller particles fall through the openings.

Applications of Sieving
- **Culinary Use:** In cooking, sieving is used to separate flour from lumps or to remove larger particles from sugar.
- **Construction:** In construction, sieving is essential for separating different sizes of aggregates used in concrete.
- **Laboratory:** In laboratories, sieving helps in analyzing soil or other granular materials for research purposes.

Comparison with Other Techniques
- **Filtration:** Unlike sieving, which separates based on size alone, filtration is used primarily for separating solids from liquids using a filter medium.
- **Winnowing:** This technique separates lighter materials from heavier ones using air currents, often used in agriculture for grain separation.
- **Churning:** Churning is a process used to separate cream from milk and is not related to particle size.

Conclusion
In summary, sieving is the correct answer as it specifically employs a sieve to separate particles based on their size, making it a fundamental method in various fields. Understanding this technique enhances one’s ability to analyze and manipulate materials effectively.

To obtain salt from seawater, which method is used?
  • a)
    Filtration
  • b)
    Evaporation
  • c)
    Sedimentation
  • d)
    Decantation
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 6 answered
To obtain salt from seawater, the method used is evaporation.
This process involves the following steps:
  • Seawater is heated, which causes the water to evaporate.
  • As the water evaporates, it leaves behind the salt as a solid residue.
  • This method is effective because water has a lower boiling point than salt.
In summary, evaporation is a reliable way to extract salt from seawater by taking advantage of the different boiling points of water and salt.

What method is used to separate tea leaves from prepared tea?
  • a)
    Sedimentation
  • b)
    Filtration
  • c)
    Decantation
  • d)
    Winnowing
Correct answer is option 'B'. Can you explain this answer?

EduRev Class 6 answered
Filtration is the method used to separate tea leaves from prepared tea. This process involves the following steps:
  • The tea is poured through a filter.
  • The liquid tea passes through while the solid tea leaves are trapped.
  • This method effectively removes solid particles from liquids.
In comparison to other methods:
  • Decantation may leave some leaves in the tea.
  • Strainers can also be used, but filtration is more effective.
Overall, filtration is a common and reliable technique for ensuring a clear cup of tea.

The different processes used to separate sand, sawdust, and salt from the mixture dissolved in water are respectively:
  • a)
    sedimentation, filtration and evaporation
  • b)
    filtration, evaporation and condensation
  • c)
    decantation and evaporation
  • d)
    hand picking and evaporation
Correct answer is option 'A'. Can you explain this answer?

Praveen Kumar answered
  • Sedimentation is used to remove sand from water as sand particles settle down easily.
  • Filtration is used to remove sawdust from water as the sawdust can be captured by the filter paper.
  • Evaporation can be used to separate salt from water as the water evaporates and salt is left behind.

A solution of sugar in which some more sugar could be dissolved without changing its temperature is called a/an :
  • a)
    unsaturated solution
  • b)
    saturated solution
  • c)
    solid solution
  • d)
    none of the above
Correct answer is option 'A'. Can you explain this answer?

Vp Classes answered
An unsaturated solution contains less solute than the saturation level, allowing it to dissolve more solute.
In the case of a sugar solution:
  • If it can still dissolve more sugar without changing temperature, it is classified as an unsaturated solution.
  • This means that additional sugar can be added and will dissolve.
Therefore, a sugar solution that can hold more solute without altering its temperature is indeed an unsaturated solution.

To separate two immiscible liquids, we use:
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Separating funnel
  • d)
    Evaporation
Correct answer is option 'C'. Can you explain this answer?

Dr Manju Sen answered
A separating funnel is an effective tool for separating two immiscible liquids, which are liquids that do not mix, such as oil and water. Here’s how it works:
  • The denser liquid settles at the bottom.
  • The less dense liquid forms the upper layer.
  • By opening the tap of the separating funnel, the liquids can be separated based on their densities.
This method is particularly useful when dealing with mixtures where the components have different densities, allowing for a clear separation.

The salt can be easily obtained from the salty water by the process of:
  • a)
    Evaporation
  • b)
    Condensation
  • c)
    Filtration
  • d)
    Both A and B
Correct answer is option 'A'. Can you explain this answer?

Dr Manju Sen answered
The process of evaporation involves converting water into vapour by heating. This method effectively separates salt from salty water. When the water is boiled, it evaporates, leaving the salt behind.
Key points about evaporation:
  • Evaporation occurs continuously wherever water is present.
  • Sea water contains various salts, including common salt.
  • When sea water is placed in shallow pits, sunlight heats it, causing the water to evaporate.
  • After several days, the water evaporates completely, leaving behind solid salts.
  • Common salt can be obtained from these salts through further purification.
In summary, evaporation is a simple and effective method for extracting salt from water.

Which method is used to separate soluble substances from a liquid?
  • a)
    Filtration
  • b)
    Evaporation
  • c)
    Sieving
  • d)
    Handpicking
Correct answer is option 'B'. Can you explain this answer?

Praveen Kumar answered
Evaporation is the method used to separate soluble substances from a liquid. This process involves the following steps:
  • When a liquid containing a dissolved substance is heated, the liquid evaporates.
  • This leaves behind the soluble substance, such as salt or sugar, as a solid residue.
  • The effectiveness of this method is due to the fact that the solvent, typically water, has a lower boiling point than the dissolved substance.
For example, in the case of sea water:
  • Sea water contains various salts, including common salt.
  • When allowed to stand in shallow pits, sunlight heats the water, causing it to evaporate.
  • After several days, the water completely evaporates, leaving behind solid salts.
  • These salts can then be further purified to obtain common salt.
In summary, evaporation is a crucial method for separating soluble substances from liquids, making it widely used in various applications.

Which method is used to separate a mixture of wheat and rice?
  • a)
    Winnowing
  • b)
    Handpicking
  • c)
    Sieving
  • d)
    Sedimentation
Correct answer is option 'C'. Can you explain this answer?

EduRev Class 6 answered
The method used to separate a mixture of wheat and rice is sieving. This process involves:
  • Using a sieve with a mesh of suitable size.
  • Allowing smaller particles, like rice, to pass through.
  • Retaining larger particles, such as wheat.
Sieving is effective for separating mixtures based on particle size. It is commonly used in various applications, including:
  • Removing impurities from flour.
  • Separating pebbles and stones from sand.
In summary, sieving is a practical method for sorting materials with different sizes, making it an essential technique in both cooking and construction.

The essential condition for winnowing activity is:
  • a)
    water
  • b)
    wind
  • c)
    electricity
  • d)
    machines
Correct answer is option 'B'. Can you explain this answer?

Coachify answered
Winnowing is a method used to separate chaff or husk from grains like wheat. This process relies on the application of wind to distinguish between heavier and lighter components.
Key points about winnowing:
  • It is commonly employed by farmers to remove lighter husk particles from heavier seeds.
  • The wind carries away the husk, allowing the seeds to form a heap.
  • The separated husk can be repurposed, for example, as fodder for cattle.
In summary, winnowing effectively uses the natural force of wind to facilitate the separation of different components in a mixture.

The process of separating butter from curd is called:
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Churning
  • d)
    Winnowing
Correct answer is option 'C'. Can you explain this answer?

Vp Classes answered
The process of separating butter from curd is called churning. This method involves:
  • Vigorously stirring or rotating the curd.
  • Separating the butterfat from the liquid, known as buttermilk.
  • Causing the butter to solidify and detach from the buttermilk.
Churning is a common technique used in dairy processing to obtain butter from curd.

What is the process of separating solid particles suspended in a liquid by allowing them to settle down called?
  • a)
    Filtration
  • b)
    Decantation
  • c)
    Sedimentation
  • d)
    Evaporation
Correct answer is option 'C'. Can you explain this answer?

EduRev Class 6 answered
Sedimentation is the process of separating solid particles suspended in a liquid by allowing them to settle due to gravity. Key points include:
  • The heavier solid particles gradually settle at the bottom of the container.
  • The clearer liquid can then be decanted or removed from the top.
  • This method is commonly used in water treatment and other scenarios where particles need to be eliminated from liquids.
Additionally, sedimentation can be applied to mixtures of two immiscible liquids, such as oil and water:
  • When allowed to stand, they form two distinct layers.
  • The top layer can be separated through decantation.
In practical applications, consider:
  • When preparing tea, using a strainer to remove tea leaves is a form of filtration.
  • Decantation can also be used to separate impurities from muddy water, allowing clear water to be poured off.

A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost the same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest?
  • a)
    Sieving
  • b)
    Winnowing
  • c)
    Magnetic separation
  • d)
    Filtration
Correct answer is option 'B'. Can you explain this answer?

Dr Manju Sen answered
Winnowing is a traditional farming technique used to separate lighter components from heavier ones in a mixture. It is particularly effective for separating grain from chaff.
Key points about winnowing:
  • It involves using air or wind to blow away lighter particles.
  • This method is ideal for heterogeneous solid-solid mixtures.
  • Winnowing is commonly employed by farmers to separate husk from heavier seeds.
  • The lighter husk is carried away by the wind, while the heavier seeds form a pile.
Winnowing is often preceded by threshing, which loosens the grain from its husks and straw. This method is not only effective for grains but can also be adapted for other mixtures.

How is salt obtained from seawater?
  • a)
    By filtration
  • b)
    By evaporation
  • c)
    By sieving
  • d)
    By handpicking
Correct answer is option 'B'. Can you explain this answer?

Kds Coaching answered
Salt is obtained from seawater through a process of evaporation.
The key steps involved are:
  • Seawater is collected in shallow pools.
  • Sunlight heats the water, causing it to evaporate.
  • As the water evaporates, the salt is left behind.
  • The remaining salt can then be harvested.

The process of obtaining clear water from muddy water using alum is called:
  • a)
    Decantation
  • b)
    Filtration
  • c)
    Sedimentation
  • d)
    Loading
Correct answer is option 'D'. Can you explain this answer?

Vp Classes answered
The process of obtaining clear water from muddy water using alum is called loading. This method involves the following steps:
  • Alum Addition: Alum is added to the muddy water.
  • Clumping: The fine dirt and impurities clump together, a process known as flocculation.
  • Settling: The larger particles settle to the bottom due to gravity, resulting in clearer water.
  • Separation: The clearer water can then be separated using decantation or filtration.

Evaporation followed by condensation occurs in:
  • a)
    Filtration
  • b)
    Sublimation
  • c)
    Evaporation
  • d)
    Distillation
Correct answer is option 'D'. Can you explain this answer?

Dr Manju Sen answered
Distillation is a process that combines evaporation and condensation to separate liquids. Here’s how it works:
  • The liquid is heated, causing it to evaporate into vapour.
  • The vapour is then cooled, leading to condensation back into liquid form.
  • This method is effective for separating mixtures based on their boiling points.
For example, in the distillation of water:
  • Water is boiled to produce steam.
  • The steam is cooled and collected as pure water.
This process is widely used in laboratories and industries for various applications.

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