6th Class Science Separation of Substances Question Bank

done Separation of Substances Total Questions - 45

• question_answer1)
  X is a separation technique based on the difference in weights of the solids in a solid-solid mixture. What is X?
  A)
   Sieving                                 done clear
  B)
   Handpicking      done clear
  C)
          Threshing           done clear
  D)
          Winnowing done clear
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• question_answer2)
  What type of a substance is steel?
  A)
   A solid - liquid heterogeneous mixture done clear
  B)
   A solid - solid heterogeneous mixture done clear
  C)
   A solid - solid homogeneous mixture done clear
  D)
   A pure substance done clear
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• question_answer3)
  Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
  A)
   A homogeneous mixture of solid and liquid done clear
  B)
   A heterogeneous mixture of liquid and liquid done clear
  C)
   A homogeneous mixture of liquid and liquid done clear
  D)
   A heterogeneous mixture of solid and liquid done clear
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• question_answer4)
  Which of the following separation techniques is used for separating a mixture of two or more gases?
  A)
   Sedimentation done clear
  B)
   Liquification done clear
  C)
   Hand picking  done clear
  D)
   Decantation done clear
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• question_answer5)
  Direction: Questions 5 - 7 are based on the following flow chart which gives the techniques a student adopted to separate the constituents of a mixture. What could the mixture be?
  A)
   Water + sand + glass done clear
  B)
   Oxygen + hydrogen + salt done clear
  C)
   Stones + rice + water done clear
  D)
   Chalk powder + sugar + water done clear
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• question_answer6)
  Direction: Questions 5 - 7 are based on the following flow chart which gives the techniques a student adopted to separate the constituents of a mixture. What could substance R be?
  A)
   Sugar                    done clear
  B)
          Chalk powder done clear
  C)
          Glass                    done clear
  D)
          Oxygen                               done clear
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• question_answer7)
  Direction: Questions 5 - 7 are based on the following flow chart which gives the techniques a student adopted to separate the constituents of a mixture. What is substance Q?
  A)
   Sugar                    done clear
  B)
          Chalk powder done clear
  C)
                          Alcohol                done clear
  D)
          Oxygen done clear
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• question_answer8)
  How are grain seeds removed from their stalks?
  A)
   Sieving       done clear
  B)
   Winnowing done clear
  C)
   Threshing     done clear
  D)
   All of the above done clear
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• question_answer9)
  A compound has
  A)
   only one kind of mixture. done clear
  B)
   only one kind of element. done clear
  C)
   a mixture of elements and molecules. done clear
  D)
   only one kind of molecules. done clear
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• question_answer10)
  A Identify the mixture from the following.
  A)
   Oxygen       done clear
  B)
   Carbon dioxide done clear
  C)
   Hydrogen     done clear
  D)
   Air done clear
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• question_answer11)
  Identify the compound from the following.
  A)
   Oxygen       done clear
  B)
   Carbon dioxide done clear
  C)
   Hydrogen     done clear
  D)
   Air done clear
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• question_answer12)
  Identify the element from the following.
  A)
   Oxygen       done clear
  B)
   Carbon dioxide done clear
  C)
   Water       done clear
  D)
   Air done clear
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• question_answer13)
  Which of the following is an example of a solid-in-gas mixture?
  A)
   Soil                        done clear
  B)
          Smoke done clear
  C)
          Moisture            done clear
  D)
          Dew                      done clear
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• question_answer14)
  Which of the following does NOT belong to the group formed by the others?
  A)
   Brass                    done clear
  B)
          Water  done clear
  C)
          Butter-milk    done clear
  D)
          Steel done clear
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• question_answer15)
  A pure substance is made of
  A)
   only one kind of atoms or molecules. done clear
  B)
          two or more kinds of molecules. done clear
  C)
          mixture of homogeneous substances done clear
  D)
          all of the above done clear
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• question_answer16)
  Which of the following statements about a mixture is TRUE?
  A)
   It is a pure substance. done clear
  B)
          Its constituents are not combined chemically. done clear
  C)
   Its constituents do not retain their individual properties. done clear
  D)
   It is always homogeneous. done clear
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• question_answer17)
  In a mixture, constituents exhibit
  A)
   similar properties. done clear
  B)
   only those properties which are characteristic to the mixture. done clear
  C)
   their own properties. done clear
  D)
   no properties. done clear
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• question_answer18)
  What is the process by which a gas changes into a liquid?
  A)
   Decantation   done clear
  B)
   Sublimation done clear
  C)
   Condensation done clear
  D)
   Sedimentation done clear
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• question_answer19)
  What kind of mixtures are alloys?        
  A)
   Solid-Gas       done clear
  B)
   Liquid-Liquid     done clear
  C)
   Gas-Gas       done clear
  D)
   Solid-Solid       done clear
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• question_answer20)
  What kind of mixtures are aerated drinks? 
  A)
   Solid-Solid     done clear
  B)
   Liquid-Solid      done clear
  C)
   Gas-Liquid     done clear
  D)
   Liquid-Liquid   done clear
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• question_answer21)
  Identify the liquid-in-gas type of mixture from the following.
  A)
   Dissolved carbon dioxide in water done clear
  B)
   Droplets of water in air done clear
  C)
   Dissolved oxygen in water done clear
  D)
   All of the above done clear
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• question_answer22)
  A homogeneous mixture
  A)
   is made up of one type of molecules. done clear
  B)
   is the one in which the components can be distinguished. done clear
  C)
   is the one in which the components cannot be distinguished. done clear
  D)
   can be separated into its constituents physically. done clear
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• question_answer23)
  A mixture contains three different substances X, Y and Z. They are of the same size, cubical in shape and yellow in colour. X particles are very heavy, insoluble, non-magnetic and contribute 50% of the mixture. Y particles are very light, insoluble, non-magnetic and contribute 40% of the mixture. And Z particles are iron pieces. Which of the following methods can separate X, Y and Z?
  A)
   Winnowing, Magnetic separation done clear
  B)
   Magnetic separation, Winnowing done clear
  C)
   Sieving, Magnetic separation. Filtration done clear
  D)
   Handpicking, Sublimation, Sieving done clear
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• question_answer24)
  The sky looks clearer and brighter after the rain due to loading by rain drops. Which of the following is similar to the process mentioned above?
  A)
   Separation of butter from curd. done clear
  B)
   Separation of salt from sea water. done clear
  C)
   Sprinkling water on a dusty street before sweeping. done clear
  D)
   Separation of grain seeds from their stalks. done clear
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• question_answer25)
  X is a separation technique used only when the components of a solid-solid mixture have different sizes. Identify X.
  A)
   Winnowing done clear
  B)
   Sieving done clear
  C)
   Threshing done clear
  D)
   Magnetic separation done clear
  View Solution play_arrow

• question_answer26)
  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?
  A)
   Only X                  done clear
  B)
          Only Y, Z              done clear
  C)
          Only Z, X             done clear
  D)
          X, Y and Z done clear
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• question_answer27)
  How is scrap-iron separated from other wastes in the scrap yard?
  A)
   Sublimation done clear
  B)
   Magnetic separation done clear
  C)
   Handpicking done clear
  D)
   Winnowing done clear
  View Solution play_arrow

• question_answer28)
  Match the entries in Column-I with those in Column-II

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

  A)
  \[a-2,\text{ }b-3,\text{ }c-4,\text{ }d-1\] done clear
  B)
   \[a-1,\text{ }b-4,\text{ }c-2,\text{ }d-3\] done clear
  C)
   \[a-2,\text{ }b-4,\text{ }c-3,\text{ }d-1\] done clear
  D)
   \[a-2,\text{ }b-4,\text{ }c-1,\text{ }d-3\] done clear
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• question_answer29)
  Which of the following mixtures can be separated by using a filter paper?
  A)
   Vinegar        done clear
  B)
   Saltwater done clear
  C)
   Sand and water done clear
  D)
   Sugar water done clear
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• question_answer30)
  Study the table given below.

  Mixture	Wanted	Unwanted
  1. Wheat flour	Flour	X
  2. Y	Grain seeds	Stalks

  Based on the above information, identify X and Y.                
  A)

  X	Y
  Husk	Cut paddy

                  done clear
  B)

  X	Y
  Wheat	Husk

                  done clear
  C)

  X	Y
  Wheat	Sawdust

                  done clear
  D)

  X	Y
  Husk	Sand

  done clear
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• question_answer31)
  Which process is used to separate a pure solid from a solid-liquid solution?
  A)
   Simple distillation done clear
  B)
   Crystallization done clear
  C)
   Filtration done clear
  D)
   Sedimentation and decantation done clear
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• question_answer32)
  Given below are some physical properties.

  (i) Physical state

  (ii) Density

  (iii) Size of constituents

  Which of the following physical properties of the constituents are utilised in separating the components of a mixture?
  A)
   Only (i) and (ii) done clear
  B)
   Only (ii) and (iii) done clear
  C)
   Only (i) and (iii) done clear
  D)
   (i), (ii) and (iii) done clear
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• question_answer33)
  What happens when distilled water is evaporated?
  A)
   Some salt is left behind. done clear
  B)
   Some sand is left behind. done clear
  C)
   Some sugar is left behind. done clear
  D)
   Nothing is left behind. done clear
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• question_answer34)
  Which process is used for separating a mixture of water and sulphur?
  A)
   Filtration      done clear
  B)
   Winnowing done clear
  C)
   Evaporation  done clear
  D)
   Distillation done clear
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• question_answer35)
  Which of the following are involved in filtration technique?
  A)
   Hair in our nostrils done clear
  B)
   Oil and air filters in cars done clear
  C)
   Air filters in air conditioners done clear
  D)
   All of the above done clear
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• question_answer36)
  What process is used for separating heterogeneous mixtures of insoluble solid-in-liquid?
  A)
   Filtration done clear
  B)
   Crystallization done clear
  C)
   Sublimation done clear
  D)
   Fractional distillation done clear
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• question_answer37)
  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?
  A)
   Salt                                        done clear
  B)
   Flour     done clear
  C)
          Sand                     done clear
  D)
          Iron filings done clear
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• question_answer38)
  Study the information given below.

  Some substances are made up of two or more elements combined together chemically.

  Properties of these substances are different from the elements that make them.

  This substances cannot be broken down by physical methods.

  Which of the following substances has the properties listed above?
  A)
   Iodine                                  done clear
  B)
   Calcium               done clear
  C)
   Air                         done clear
  D)
          Sugar done clear
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• question_answer39)
  Which process takes place in a washing machine while clothes are being dried.
  A)
   Magnetic separation done clear
  B)
   Filtration done clear
  C)
   Evaporation done clear
  D)
   Centrifugation done clear
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• question_answer40)
  The flow chart given below are examples of materials X and Y. Identify X and Y.                    
  A)

  X	Y
  Non metals	Metals

                  done clear
  B)

  X	Y
  Mixtures	Metals

                  done clear
  C)

  X	Y
  Compounds	Elements

                  done clear
  D)

  X	Y
  Compounds	Pure substances

  done clear
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• question_answer41)
  Which of the following statements is NOT true?
  A)
   No more salt can be dissolved in a saturated solution of salt water without heating. done clear
  B)
   Water dissolves different amounts of soluble substances in it. done clear
  C)
   A mixture of milk and water can be separated by filtration. done clear
  D)
   Salt is separated from sea water by evaporation. done clear
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• question_answer42)
  By which method is wheat flour separated from wheat bran?
  A)
   Handpicking done clear
  B)
   Sieving done clear
  C)
   Winnowing done clear
  D)
   Filtration                               done clear
  View Solution play_arrow

• question_answer43)
  Which of the following is NOT a pure substance?
  A)
   Argon                   done clear
  B)
          Helium done clear
  C)
          Water                  done clear
  D)
          Air done clear
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• question_answer44)
  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.

  A)
   Only (i) and (ii) done clear
  B)
   Only (ii) and (iii) done clear
  C)
   Only (i) and (iii) done clear
  D)
   (i), (ii) and (iii) done clear
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• question_answer45)
  A glass filled with ice cubes is kept on a table. After sometime water drops were observed sticking to the outside of the glass. Which of these sentences is TRUE of this phenomenon?

  (i) This phenomenon is known as condensation.

  (ii) This proves that water vapour is present in air.

  (iii) This is also observed when a hot object is cooled in the open.

  A)
   Only (i) and (ii) done clear
  B)
   Only (ii) and (iii) done clear
  C)
   Only (i) and (iii) done clear
  D)
   (i), (ii) and (iii) done clear
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