MCQ & Extra Questions: Methods of Separation in Everyday Life | Science Class 6 PDF Download

Extra Questions 

Q1: Why is evaporation used in the salt-making process?

Evaporation is used in salt-making because it removes the water from seawater or salt solutions, leaving the salt crystals behind.

Q2: Why is sieving not suitable for separating a mixture of liquids?

Sieving is used for separating solid mixtures based on particle size and is ineffective for separating liquids because liquids can pass through all sizes of sieve holes.

Q3: What happens during the process of evaporation?

During evaporation, a liquid is converted into vapor, leaving behind any dissolved solid components, such as salt from seawater.

Q4: How does decantation differ from filtration?

Decantation involves gently pouring off a liquid from a settled solid, while filtration involves passing a liquid through a filter to separate insoluble solids.

Q5: In what situation would handpicking be the most effective method of separation?

Handpicking is most effective when the unwanted component, such as stones or debris, is larger and easily distinguishable from the rest of the mixture.

Q6: What is the principle behind sedimentation and decantation?

Sedimentation allows heavier particles to settle at the bottom of a liquid, and decantation is the process of pouring off the clear liquid without disturbing the settled particles.

Q7: How can you separate a mixture of sand and iron filings?

A mixture of sand and iron filings can be separated by using a magnet, which attracts the iron filings, leaving the sand behind.

Multiple Choice Questions

Q1: What method is best for separating a mixture of oil and water?
a) Decantation
b) Filtration
c) Handpicking
d) Winnowing
Ans: a) Decantation

Decantation is used to separate immiscible liquids like oil and water, where the lighter oil can be poured off after settling.

Q2: Which method is commonly used to separate the husk from grains?
a) Handpicking
b) Winnowing
c) Sieving
d) Sedimentation
Ans: b) Winnowing

Winnowing is effective in separating husk from grains by using wind to blow away the lighter husk.

Q3: What is the purpose of using a sieve in construction sites?
a) To separate fine particles from coarse materials
b) To filter water
c) To settle heavy particles
d) To remove iron particles
Ans: a) To separate fine particles from coarse materials

Sieving is used in construction to separate fine sand from larger particles like stones.

Q4: Which of the following is separated by handpicking?
a) Salt from seawater
b) Sand from water
c) Pebbles from rice
d) Oil from water
Ans: c) Pebbles from rice

Handpicking is effective for separating easily distinguishable large particles like pebbles from grains like rice.

Q6: Which of the following is an example of sedimentation?
a) Settling of tea leaves in a cup of tea
b) Separation of butter from curd
c) Separation of iron filings from sand
d) Sieving of flour
Ans: a) Settling of tea leaves in a cup of tea

Sedimentation occurs when heavier tea leaves settle at the bottom of the cup.

Q7: What happens when salt solution is left to dry on a dark paper?
a) Salt dissolves completely
b) Salt remains on the paper
c) Water evaporates, leaving the salt behind
d) Salt turns into liquid
Ans: c) Water evaporates, leaving the salt behind

When a salt solution is left to dry, the water in the solution evaporates due to the heat or air exposure. Salt, which is a solid, does not evaporate with the water. As the water evaporates, it leaves the salt crystals behind on the paper. This process is a practical example of evaporation where the solvent (water) is removed, leaving the solute (salt) behind.

Q8: What process is used to separate butter from curd?
a) Filtration
b) Winnowing
c) Churning
d) Sieving
Ans: c) Churning

Churning is the process used to separate butter from curd. When curd (or buttermilk) is churned, the fat globules in the curd are agitated, causing them to clump together and separate from the liquid (buttermilk). This results in the formation of butter, which is a solid, while the remaining liquid is buttermilk. Churning is an effective method for this separation due to the mechanical action of mixing and agitation.