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Important Questions Test: Separation of Substances - UPSC MCQ


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20 Questions MCQ Test Science & Technology for UPSC CSE - Important Questions Test: Separation of Substances

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Important Questions Test: Separation of Substances - Question 1

The process of settling down of particles of a solid in a liquid is known as

Detailed Solution for Important Questions Test: Separation of Substances - Question 1

The process of settling down of particles of a solid in a liquid is known as sedimentation.

Important Questions Test: Separation of Substances - Question 2

Salt is obtained from sea water by using which of the following process.

Detailed Solution for Important Questions Test: Separation of Substances - Question 2

Seawater contains a large amount of common salt and the salts of other metals dissolved in it. Near the sea-shore, the sea water is collected in shallow pits and allowed to evaporate in the sunshine. In a few days, the water evaporates, leaving behind salt. Hence it is obtained by evaporation.

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Important Questions Test: Separation of Substances - Question 3

The process of separating the constituents of a liquid by agitating it vigorously

Detailed Solution for Important Questions Test: Separation of Substances - Question 3
  • Churning: This process involves vigorously mixing a liquid, which helps separate its components based on their densities or states.
  • Commonly used in making butter from cream, churning incorporates air and creates movement that breaks apart fat globules, allowing them to clump together.
  • It's a physical method, relying on mechanical agitation rather than chemical reactions, making it effective for separating liquid mixtures.
Important Questions Test: Separation of Substances - Question 4

X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?

Detailed Solution for Important Questions Test: Separation of Substances - Question 4

X is winnowing, a process which uses the difference in weights of solids in a solid- solid mixture for separating the components.

Important Questions Test: Separation of Substances - Question 5

A solution which cannot dissolve more of a given substance at a given temperature is

Detailed Solution for Important Questions Test: Separation of Substances - Question 5

A solution that has reached the maximum solubility is called a saturated solution . It means you can no longer add solute to the solution . Saturated solution are required for the process of crystallization.

Important Questions Test: Separation of Substances - Question 6

Why do we separate substances in a mixture?

(i) To separate two different but useful components.
(ii) To remove useless components.
(iii) To remove impurities.

Detailed Solution for Important Questions Test: Separation of Substances - Question 6

We separate substances in a mixture to obtain useful components, remove useless components and impurities.

Important Questions Test: Separation of Substances - Question 7

Which of the following does NOT belong to the group formed by the others?

Detailed Solution for Important Questions Test: Separation of Substances - Question 7

Water is a pure substance and all others are solid-in-solid and solid-in-liquid mixtures.

Important Questions Test: Separation of Substances - Question 8

The method used to separate a dissolved solid component from its solution

Detailed Solution for Important Questions Test: Separation of Substances - Question 8

Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. This is the method used to separate a dissolved solid component from its solution as after evaporation only salt remains.

Important Questions Test: Separation of Substances - Question 9

Butter is separated from curd by the process of ______________ .

Detailed Solution for Important Questions Test: Separation of Substances - Question 9

Milk or curd is churned to separate the butter

Important Questions Test: Separation of Substances - Question 10

The separation technique used to separate a solid‐solid mixture is ____. 

Detailed Solution for Important Questions Test: Separation of Substances - Question 10

Answer : D

Handpicking


  • Handpicking is a separation technique used to separate a solid-solid mixture.

  • In this method, the individual components of the mixture are picked out by hand based on their physical properties.

  • It is commonly used when the solid components have distinct differences in size, color, or shape, making them easy to separate manually.

  • Handpicking is a simple and cost-effective method, but it may not be suitable for mixtures with very fine particles or similar properties
Important Questions Test: Separation of Substances - Question 11

Separating the insoluble suspended solids of various sizes from a liquid is called

Detailed Solution for Important Questions Test: Separation of Substances - Question 11

Filtration is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter. The liquid which has passed through the filter is called the filtrate.

Important Questions Test: Separation of Substances - Question 12

Principle behind winnowing is

Detailed Solution for Important Questions Test: Separation of Substances - Question 12

Winnowing is the method of separting of a mixture contaning heavier and lighter component by wind is by winnowing air.

Wind winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It is also used to remove hay and chaff or other pests from stored grain.

Threshing, the loosening of grain or seeds from the husks and straw is the step in the chaff-removal process that comes before winnowing.

Important Questions Test: Separation of Substances - Question 13

Paneer is separated from curdled milk

Detailed Solution for Important Questions Test: Separation of Substances - Question 13

Explanation:

Paneer is separated from curdled milk through the process of filtration. When milk is curdled by adding an acid like lemon juice or vinegar, the solid curds (which become paneer) are separated from the liquid whey. Filtration is used to separate the solid curds from the liquid, leaving you with paneer.

Important Questions Test: Separation of Substances - Question 14

Corn is separated from husk by the process of

Detailed Solution for Important Questions Test: Separation of Substances - Question 14

Winnowing is the process of separation of the heavier components from the lighter components of a mixture by wind or by blowing air. It is generally used by farmers to separate the lighter impurities such as husk particles from the heavier grains.

Important Questions Test: Separation of Substances - Question 15

A mixture of sugar and water can be separated by

Detailed Solution for Important Questions Test: Separation of Substances - Question 15

The easiest method to separate mixture of sugar and water is evaporation as it will evaporate water and will leave behind the sugar molecules. 

Important Questions Test: Separation of Substances - Question 16

A saturated solution can dissolve more of a substance on

Detailed Solution for Important Questions Test: Separation of Substances - Question 16

Saturated solution means solution that is not capable of dissolving more solute at given temperature. If we increase the temperature it can dissolve more solute.

Important Questions Test: Separation of Substances - Question 17

The clear liquid obtained after filtration is called

Detailed Solution for Important Questions Test: Separation of Substances - Question 17

The clear liquid which passes through the filter paper is called the filtrate.

Important Questions Test: Separation of Substances - Question 18

Given below are some methods of separation.

X - Winnowing  
Y - Threshing  
Z - Sieving

Which of the following methods of separation does not require air for the process of separation?

Detailed Solution for Important Questions Test: Separation of Substances - Question 18

Only winnowing (X) needs air for the process of separation. While threshing (Y) and sieving (Z) do not need air while they are carried out.

Important Questions Test: Separation of Substances - Question 19

What technique is used when the particles are too small to be separated by hand and the quantity is large?

Detailed Solution for Important Questions Test: Separation of Substances - Question 19

Sieving is used when particles are too small to be picked by hand and the quantity is large.
Sieving. It is done to separate mixtures that contain substances mostly of different sizes. The mixture is passed through the pores of the sieve. All the smaller substances pass through easily while the bigger components of the mixture are retained.

Important Questions Test: Separation of Substances - Question 20

What term describes the process of converting water vapor into its liquid form?

Detailed Solution for Important Questions Test: Separation of Substances - Question 20

Condensation is the process by which water vapour changes into liquid water when it comes into contact with a cooler surface. It is a crucial part of the water cycle and plays a significant role in various natural phenomena, such as the formation of clouds and dew.

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