6th Class Science Changes Around us Question Bank

done Changes around us Total Questions - 50

• question_answer1)
  Study the table given below. Which of the above changes is wrongly classified?
  A)
   W                                           done clear
  B)
          X                            done clear
  C)
          Y                                             done clear
  D)
          Z done clear
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• question_answer2)
  Why is the rusting of iron termed as a chemical change?
  A)
   It is a temporary change. done clear
  B)
          It can be cleaned and the original substance can be recovered. done clear
  C)
          It is a slow reaction. done clear
  D)
          A new substance is formed. done clear
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• question_answer3)
  Pasteurization of milk is a
  A)
   physical and reversible change. done clear
  B)
          chemical and reversible change. done clear
  C)
          chemical and irreversible change. done clear
  D)
          neither physical nor chemical change. done clear
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• question_answer4)
  Which of the following are desirable changes?

  (i) Drying of clothes

  (ii) Growth of weeds

  (iii) Cement getting hard when exposed to moisture

  (iv) Desalination of sea water

  A)
   Only (i) and (ii) done clear
  B)
          Only (ii) and (iii) done clear
  C)
          Only (i) and (iv) done clear
  D)
          Only (i), (ii) and (iv) done clear
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• question_answer5)
  What is the change taking place in the following processes?
  A)
   Irreversible, physical change done clear
  B)
          Chemical change done clear
  C)
          Reversible, physical change done clear
  D)
          Reversible, chemical change done clear
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• question_answer6)
  A Sheela cooked rice in a rice cooker. What kind of change took place?

  (i) Irreversible change

  (ii) Endothermic change

  (iii) Natural change

  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_answer7)
  Nitrogen reacts with hydrogen under high temperature and pressure and forms ammonia. Which type of change is undergone in the given example?
  A)
   A chemical change done clear
  B)
          A physical change done clear
  C)
          An exothermic reaction done clear
  D)
          A natural change done clear
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• question_answer8)
  Which of the following is NOT a feature of a physical change?
  A)
   It is reversible. done clear
  B)
          It is temporary. done clear
  C)
          No new substance is formed.       done clear
  D)
          The composition of the substance changes.                       done clear
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• question_answer9)
  Choose the incorrect statement.       
  A)
   The heating of sugar is a permanent change.                        done clear
  B)
          Sugar decomposes to form charcoal. done clear
  C)
          The crystallization of sugar is a chemical change. done clear
  D)
          The powdering of sugar is a physical change. done clear
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• question_answer10)
  What kind of change do the batteries used in a wrist watch undergo?
  A)
   A physical change done clear
  B)
          A periodic change done clear
  C)
          A chemical change done clear
  D)
          An endothermic change done clear
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• question_answer11)
  If we suspend a weight using a spring, it stretches. What type of a change is this?
  A)
   Man-made    done clear
  B)
          Reversible done clear
  C)
          Irreversible    done clear
  D)
          Both (a) and (b) done clear
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• question_answer12)
  Which of these changes does a burning match stick undergo?

  (i) Endothermic reaction

  (ii) Exothermic reaction

  (iii) Chemical change

  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_answer13)
  What is the process by which a substance changes from solid to liquid state called?
  A)
   Boiling                                  done clear
  B)
          Condensation   done clear
  C)
          Freezing                              done clear
  D)
          Melting done clear
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• question_answer14)
  On lowering the temperature, a liquid turns into a solid. What is this process called?
  A)
   Condensation done clear
  B)
          Melting done clear
  C)
          Freezing      done clear
  D)
          Sublimation done clear
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• question_answer15)
  Which of the following does NOT take place during the tearing of a paper?
  A)
   Change of shape done clear
  B)
          Change of size done clear
  C)
          Change of substance done clear
  D)
          All of the above done clear
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• question_answer16)
  Why do we keep food in a refrigerator?
  A)
   To save money done clear
  B)
          To make food tastier done clear
  C)
          To prevent food from getting spoiled done clear
  D)
          It is fashionable to keep food in the refrigerator done clear
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• question_answer17)
  What is a chemical reaction in which heat energy is liberated called?
  A)
   An exothermic reaction done clear
  B)
          A physical change done clear
  C)
          An endothermic reaction done clear
  D)
          A photochemical reaction done clear
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• question_answer18)
  Which of the following is a natural, non-periodic change?
  A)
   The heart beat of a human being done clear
  B)
          The low and high tides done clear
  C)
          The eruption of volcanoes done clear
  D)
          The sunrise and sunset done clear
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• question_answer19)
  In a physical change, which of the following takes place?

  (i) No new substance is formed.

  (ii) The change is reversible.

  (iii) The change is temporary

  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_answer20)
  The burning of coal in air is a                  
  A)
   physical change.                         done clear
  B)
          chemical change.       done clear
  C)
                         reversible change. done clear
  D)
          periodic change. done clear
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• question_answer21)
  When you burn petrol, flames appear. What type of a reaction is this?
  A)
   An endothermic reaction done clear
  B)
          An exothermic reaction done clear
  C)
          A physical change done clear
  D)
          A reversible reaction done clear
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• question_answer22)
  What is the process of heating a liquid to a high temperature and rapidly cooling it so that the bacteria is killed called?
  A)
   Pasteurization done clear
  B)
          Chlorination done clear
  C)
          Bacterial disinfection done clear
  D)
          Sublimation done clear
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• question_answer23)
  Which of the following is a natural, periodic change?
  A)
   The occurrence of days and nights. done clear
  B)
          The explosion of a bomb. done clear
  C)
          The occurrence of an earthquake,   done clear
  D)
          Formation of snow. done clear
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• question_answer24)
  Identify the chemical change from the following.
  A)
   The melting of ice done clear
  B)
          The heating of sugar crystals done clear
  C)
          The freezing of water done clear
  D)
          The dissolution of salt in water done clear
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• question_answer25)
  The magnetic properties of iron disappear when it is heated strongly. Which of these changes does this illustrate?
  A)
   A chemical change done clear
  B)
          An irreversible change done clear
  C)
          A physical change done clear
  D)
          A periodic change done clear
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• question_answer26)
  What kind of change is the dissolving of sugar in water?
  A)
   Periodic change done clear
  B)
          Reversible change done clear
  C)
          Irreversible change done clear
  D)
          Chemical change done clear
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• question_answer27)
  On heating, the colour of zinc oxide changes from white to yellow. What type of change is this?
  A)
   A physical change done clear
  B)
          A chemical change done clear
  C)
          A photochemical change done clear
  D)
          An irreversible change done clear
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• question_answer28)
  Which of the following is a chemical change?
  A)
   The burning of magnesium wire done clear
  B)
          The heating of an iron rod done clear
  C)
          The heating of water done clear
  D)
          The dissolving of salt in water done clear
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• question_answer29)
  What kind of change is the making of a ring from pure gold?
  A)
   An irreversible, chemical change done clear
  B)
          An irreversible, physical change done clear
  C)
          A reversible, chemical change done clear
  D)
          A reversible, physical change done clear
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• question_answer30)
  When water with sugar is stirred with a spoon, sugar is dissolved faster. Why does this happen?
  A)
   The spoon acts as a catalyst. done clear
  B)
          On stirring, the temperature increases. done clear
  C)
          Stirring increases the rate of interaction. done clear
  D)
          The attraction between the molecules of sugar increases. done clear
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• question_answer31)
  The germination of a seed is
  A)
   a physical, reversible change in which energy is produced. done clear
  B)
          a fast, desirable chemical reaction in which energy is released. done clear
  C)
          a slow, irreversible and desirable, chemical change. done clear
  D)
          A fast, irreversible and undesirable chemical change. done clear
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• question_answer32)
  Based on the flow chart given below, which of the following is correctly represented by P and Q?                
  A)

  P	Q
  Boiling	Evaporation

                  done clear
  B)
        

  P	Q
  Evaporation	Boiling

                  done clear
  C)
        

  P	Q
  Boiling	Condensation

                  done clear
  D)
        

  P	Q
  Evaporation	Condensation

  done clear
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• question_answer33)
  Identify the fast reaction from the following.
  A)
   The burning of a match stick done clear
  B)
          The seed changing into a big tree done clear
  C)
          The biodegradation of paper done clear
  D)
          The change of milk into curd done clear
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• question_answer34)
  The given figure shows the rotation and revolution of the earth on its axis and around the sun respectively. What kind of change does the earth undergo?
  A)
   Physical change done clear
  B)
          Chemical change done clear
  C)
          Periodic change done clear
  D)
          Undesirable change done clear
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• question_answer35)
  Identify the periodic change from the following.
  A)
   The growth of plants done clear
  B)
          The occurrence of storms done clear
  C)
          The occurrence of floods done clear
  D)
          The revolution of the earth done clear
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• question_answer36)
  Which one of the following is NOT an undesirable change?
  A)
   The spoiling of food done clear
  B)
          The growth of weeds done clear
  C)
          Over ripening of fruits done clear
  D)
          The curdling of milk done clear
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• question_answer37)
  Which of the following is NOT a physical change?
  A)
   The tearing of paper done clear
  B)
          A magnet losing its magnetic property done clear
  C)
          The rusting of iron done clear
  D)
          An inflated balloon done clear
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• question_answer38)
  If you pour a few drops of petrol on your palm, you will feel cool as it evaporates. What type of reaction is this?
  A)
   Endothermic reaction done clear
  B)
          Exothermic reaction done clear
  C)
          Chemical reaction done clear
  D)
          Slow reaction done clear
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• question_answer39)
  Which of the following statements is true of the changes when a mixture of iron powder and sulphur powder are heated?
  A)
   Iron and sulphur are called the reactants. done clear
  B)
          Iron and sulphur form a solution. done clear
  C)
          Iron and sulphur can be easily separated after the reaction. done clear
  D)
          A new product is formed which has all the properties of iron and sulphur. done clear
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• question_answer40)
  Karuna wrapped some green gram pulses in a wet cotton cloth. She opened it after a couple of days and found small, white thread like structures on the seeds. What change did the pulses undergo?
  A)
   They have undergone a physical change. done clear
  B)
          They became fresh as usual by washing and drying. done clear
  C)
          They have undergone a chemical change. done clear
  D)
          They have undergone a reversible, physical change. done clear
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• question_answer41)
  Identify a change that is NOT man-made and is irreversible.
  A)
   The burning of paper done clear
  B)
          The stretching of a spring by a suspended weight done clear
  C)
          Soil erosion due to floods done clear
  D)
          The boiling of an egg done clear
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• question_answer42)
  Which of these is NOT a physical change?
  A)
   Sulphur dissolved in carbon disulphide done clear
  B)
          Resin dissolved in alcohol done clear
  C)
          The fermentation of cane juice done clear
  D)
          The glowing of an electric bulb done clear
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• question_answer43)
  Observe the venn diagram given below. Which of the following processes could ?X? be?
  A)
   The rusting of iron done clear
  B)
          The burning of wood done clear
  C)
          The melting of wax done clear
  D)
          Milk changing to curd done clear
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• question_answer44)
  Given below is a change that occurs in butter. Identify X and Y that cause change in the state of butter.
  A)
   X - Heat lost, Y - Heat gained done clear
  B)
          X - Heat gained, Y - Heat lost done clear
  C)
          X - Release of energy, Y - Absorption of energy done clear
  D)
          X - Decrease in temperature, Y - Increase in temperature done clear
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• question_answer45)
  Which of the following changes is slow and periodic?
  A)
   The rotation of the earth done clear
  B)
          The rusting of iron done clear
  C)
          The curdling of milk done clear
  D)
          The evaporation of petrol done clear
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• question_answer46)
  Which of the following changes results in the formation of a new substance?
  A)
   Physical                               done clear
  B)
          Chemical                             done clear
  C)
          Reversible          done clear
  D)
          Periodic done clear
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• question_answer47)
  Which of the following is an endothermic reaction?
  A)
   The formation of curd from milk done clear
  B)
          The production of gas when quicklime is added to water done clear
  C)
          The opening of a soda bottle with production of gas done clear
  D)
          The freezing of water done clear
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• question_answer48)
  In the given figure, a boy is kicking a football. What type of change is this?
  A)
   Exothermic   done clear
  B)
          Endothermic done clear
  C)
          Physical      done clear
  D)
          Chemical done clear
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• question_answer49)
  If two substances interact to produce a change, they will do
  A)
   so under any condition. done clear
  B)
          only if they are not in close contact with each other. done clear
  C)
          under any temperature. done clear
  D)
          under the right conditions. done clear
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• question_answer50)
  Which of the following is NOT true about a chemical change?
  A)
   It involves reactants and products. done clear
  B)
          It is an irreversible change. done clear
  C)
          Energy changes take place in it. done clear
  D)
          The reactants can be retrieved by physical methods. done clear
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