UPSC Exam  >  UPSC Tests  >  Science & Technology for UPSC CSE  >  Important Questions Test: Separation of Substances - UPSC MCQ

Important Questions Test: Separation of Substances - UPSC MCQ


Test Description

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

Important Questions Test: Separation of Substances for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Important Questions Test: Separation of Substances questions and answers have been prepared according to the UPSC exam syllabus.The Important Questions Test: Separation of Substances MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Separation of Substances below.
Solutions of Important Questions Test: Separation of Substances questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Important Questions Test: Separation of Substances solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Important Questions Test: Separation of Substances | 25 questions in 25 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
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

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 5

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 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

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 7

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

Important Questions Test: Separation of Substances - Question 8

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

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

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

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

Match the entries in Column-I with those in Column-II

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

A chalk water mixture is a heterogeneous solid-liquid mixture. A glucose solution is a homogeneous solid- liquid mixture. Carbonated water is a gas-liquid mixture. Air is a gaseous mixture, a-2, b-3, c-4, d-1.

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

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

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

Nisha poured a mixture of salt, iron filings, sand and flour into a container.

Which of the following substances can be separated from the mixture by using a magnet?

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

In the given mixture, iron filings being magnetic are separated from non- magnetic substances.

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

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 24

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 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.

165 videos|338 docs|324 tests
Information about Important Questions Test: Separation of Substances Page
In this test you can find the Exam questions for Important Questions Test: Separation of Substances solved & explained in the simplest way possible. Besides giving Questions and answers for Important Questions Test: Separation of Substances, EduRev gives you an ample number of Online tests for practice
165 videos|338 docs|324 tests
Download as PDF

How to Prepare for UPSC

Read our guide to prepare for UPSC which is created by Toppers & the best Teachers
Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!