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Important Questions Test: Separation of Substances


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25 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.

Important Questions Test: Separation of Substances - Question 3

The process of increasing the rate of sedimentation in a suspension by adding some chemical is

Detailed Solution for Important Questions Test: Separation of Substances - Question 3

Loading process (in chemistry) is the process used to speed up the sedimentation process with the help of chemical called ‘Alum’.

Sedimentation involves settling down of suspended heavy particles present in a mixture at the bottom of the container when left undisturbed for some time. The particles settled down are called sediment. After sedimentation, decantation is carried out by pouring off the liquid to separate the solid sediment.

Important Questions Test: Separation of Substances - Question 4

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

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

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

Important Questions Test: Separation of Substances - Question 5

The method that is used to obtain pure salt from impure salt

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

Crystallization of salt is defined as the procedure in which we dissolve the salt in a solvent. Then some of its particles will dissolve and some will continue undisclosed which are the impurities. Thus, we can conclude that the method that is used to get pure salt from impure salt is crystallization.

Important Questions Test: Separation of Substances - Question 6

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 6

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 7

This harmful microbe in water causes typhoid and jaundice

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Harmful diseases like jaundice and typhoid are caused by bacteria.

Important Questions Test: Separation of Substances - Question 8

Rain water is a kind of

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

It is distilled water.Because it has been boiled as a vapour and condensed back as a liquid form..
thus, rain water is also known as the purest form of water.

Important Questions Test: Separation of Substances - Question 9

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

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

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 10

Butter is separated from curd by the process of

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

Milk or curd is churned to separate the butter

Important Questions Test: Separation of Substances - Question 11

A pure solid is obtained from its solution by the process of

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

Crystallization is the process of slow precipitation of solid crystals of a substance from a concentrated homogeneous solution. The substance is thus obtained in pure crystalline form and has no impurity.

Important Questions Test: Separation of Substances - Question 12

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

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

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 13

Cotton fibre is separated from cotton seeds by the process of

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Ginning: Cotton Ginning is the process of separating the cotton fibers from the cotton seeds. Perfect ginning operation would be performed if the separation of fibers from seed was effected without the slightest injury to either seeds or to the fiber.

Important Questions Test: Separation of Substances - Question 14

Principle behind winnowing is

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

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 15

Paneer is separated from curdled milk

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

This paneer is then separated from the curdled milk by filtering it through a muslin or any other fine cotton cloth.

Important Questions Test: Separation of Substances - Question 16

Which type of boiling occurs in steam boilers employing natural convection?

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

Pool boiling is the process in which the heating surface is submerged in a large body of stagnant liquid. The relative motion of the vapour produced and the surrounding liquid near the heating surface is due primarily to the buoyancy effect of the vapour that is free convection.

Important Questions Test: Separation of Substances - Question 17

Corn is separated from husk by the process of

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

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 18

A mixture of sugar and water can be separated by

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

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 19

A saturated solution can dissolve more of a substance on

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

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 20

To evaporate a liquid into its vapour, heat the liquid ____

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

In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, can break away from the forces of attraction of other particles and gets converted into vapour. The conversion of a liquid into vapours at any temperature below its boiling point is called evaporation.

Hence, the correct option is 'B'.

Important Questions Test: Separation of Substances - Question 21

The clear liquid obtained after filtration is called

Detailed Solution for Important Questions Test: Separation of Substances - Question 21

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

Important Questions Test: Separation of Substances - Question 22

Alum is added to muddy water to

Detailed Solution for Important Questions Test: Separation of Substances - Question 22

Aluminium Sulfate, Shortly known as Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water, and settles down at the bottom of the container.

Important Questions Test: Separation of Substances - Question 23

The process of making particles of mud heavy with alum

Detailed Solution for Important Questions Test: Separation of Substances - Question 23

Loading is the process in which alum particles are deposited on suspended clay particles of muddy water to make them heavy and settle down rapidly.

Important Questions Test: Separation of Substances - Question 24

The addition of bleaching powder to the water

Detailed Solution for Important Questions Test: Separation of Substances - Question 24

Adding Bleaching powder is the most common technique used to purify the water supplied. It can kill the micro-organisms like protozoans which cause water bone diseases. In places where there are no options to purify water, bleaching powder is the only remedy.

Important Questions Test: Separation of Substances - Question 25

Separation of kerosene oil and water is done by

Detailed Solution for Important Questions Test: Separation of Substances - Question 25

Kerosene oil and water are immiscible liquids. A mixture of the two can be separated with the help of separating funnel. The process is decantation.

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