7th Class Science Physical and Chemical Changes Question Bank

done Physical and Chemical Changes Total Questions - 40

• question_answer1)
  What kind of change does a glowing electric bulb undergo?
  A)
   Physical change done clear
  B)
   Chemical change done clear
  C)
   Irreversible change done clear
  D)
   Undesirable change done clear
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• question_answer2)
  Identify the change undergone by burning of wood.
  A)
   Reversible change done clear
  B)
   Physical change done clear
  C)
   Chemical change done clear
  D)
   All of the above done clear
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• question_answer3)
  Which of the following is NOT a chemical change?
  A)
   Digestion of food done clear
  B)
   Precipitation of rain and snow done clear
  C)
   Rusting of iron done clear
  D)
   Burning of paper done clear
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• question_answer4)
  Why is the rusting of iron grouped under a chemical change?
  A)
   It changes its colour. done clear
  B)
   It becomes powdery. done clear
  C)
   A new substance is formed. done clear
  D)
   It changes its shape. done clear
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• question_answer5)
  Study the reaction given below.

  Copper sulphate (soln.) + Iron \[\to \] Iron sulphate (soln.) + Copper

  What kind of a change takes place in the given reaction?
  A)
   Chemical change done clear
  B)
   Physical change done clear
  C)
   Biochemical done clear
  D)
   Both (A) and (B) done clear
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• question_answer6)
  What kind of change is undergone when wheat flour is made into a chapati?
  A)
   Physical change. done clear
  B)
   Reversible, chemical change. done clear
  C)
   Irreversible, chemical change. done clear
  D)
   Change of state. done clear
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• question_answer7)
  Which of the following is a chemical change?
  A)
   Food gives out a foul smell done clear
  B)
   Pollution of air caused due to explosion of fireworks done clear
  C)
   Change of colour in a cut apple, if left outside done clear
  D)
   All of the above done clear
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• question_answer8)
  Some pieces of chalk are mixed with water. In this change, how many new substances is/are formed?
  A)
   1 done clear
  B)
   2 done clear
  C)
   3 done clear
  D)
   No new substance is formed. done clear
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• question_answer9)
  Pooja took a candle in a vessel and heated the vessel. Even though the candle did not burn, it changed its shape and state. What kind of change is this?
  A)
   Neutralization done clear
  B)
   Physical change done clear
  C)
   Chemical change done clear
  D)
   Irreversible change done clear
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• question_answer10)
  What kind of change does sodium chloride undergo when it is added to water?
  A)
   Physical change done clear
  B)
   Chemical change done clear
  C)
   Chemical reaction done clear
  D)
   Temporary change done clear
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• question_answer11)
  Match the entries in Column-l with those in Column-ll.

  	Column I		Column II
  (a)	Burning of wood	1	Physical change
  (b)	Formation of day and night	2	Slow change
  (c)	Curdling of milk	3	Periodic change
  (d)	Melting of ice	4	Chemical change

  A)
   a-2, b-3, c-4, d-1 done clear
  B)
   a-4, b-3, c-2, d-1 done clear
  C)
   a-4, b-3, c-1, d-2 done clear
  D)
   a-3, b-4, c-2, d-1 done clear
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• question_answer12)
  Which of the following is a physical change?
  A)
   Grinding of wheat done clear
  B)
   Photosynthesis                    done clear
  C)
   Curdling of milk  done clear
  D)
                      Burning of coal done clear
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• question_answer13)
  Which of the following properties of iron is NOT a physical property?
  A)
   Electrical conductivity done clear
  B)
   Magnetic property done clear
  C)
   Good conductor of heat done clear
  D)
   Reaction with moisture to get rusted done clear
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• question_answer14)
  Which of the following is NOT a property of physical change?
  A)
   Change in state and colour done clear
  B)
   Change in composition done clear
  C)
   Temporary change done clear
  D)
   Reversible change done clear
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• question_answer15)
  What kind of change is undergone by the expansion of railway tracks during summer?
  A)
   Irreversible, physical change done clear
  B)
   Reversible, physical change done clear
  C)
   Irreversible, chemical change done clear
  D)
   Reversible, chemical change done clear
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• question_answer16)
  Which of the following is NOT a physical change?
  A)
   Tearing a paper done clear
  B)
   Heating an iron rod to bend it done clear
  C)
   Freezing water into ice done clear
  D)
   Growth of a sapling into a tree done clear
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• question_answer17)
  What kind of change is neutralization?
  A)
   A physical change done clear
  B)
   A chemical change done clear
  C)
   Sometimes a physical and some- times a chemical change done clear
  D)
   Neither a physical nor a chemical change done clear
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• question_answer18)
  Identify the correct characteristic of a physical change.
  A)
   Permanent change done clear
  B)
   Irreversible done clear
  C)
   Change in composition done clear
  D)
   Change in colour done clear
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• question_answer19)
  Which of the following changes does sugar undergo when it is dissolved in water to form sugar solution?
  A)
   Chemical change done clear
  B)
   Physical change done clear
  C)
   Neutralization reaction done clear
  D)
   Irreversible change done clear
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• question_answer20)
  Which of the following is a chemical change?
  A)
   Cooking of food done clear
  B)
   Evaporation of water done clear
  C)
   Mowing of grass done clear
  D)
   Melting of wax done clear
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• question_answer21)
  Which of the following is NOT a chemical change?
  A)
   Respiration done clear
  B)
   Crystallization done clear
  C)
   Combustion done clear
  D)
   Oxidation done clear
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• question_answer22)
  Which of the following is NOT correctly paired?
  A)
   Sublimation - Physical change done clear
  B)
   Precipitation - Physical change done clear
  C)
   Decomposition - Chemical change done clear
  D)
   Decantation - Chemical change done clear
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• question_answer23)
  What kind of change is undergone by the burning of wax?
  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_answer24)
  Which of the following is an irreversible change?
  A)
   Change of water into steam done clear
  B)
   Melting of wax done clear
  C)
   Transpiration done clear
  D)
   Corrosion done clear
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• question_answer25)
  When a substance undergoes a physical change, what change is seen in its mass?
  A)
  It increases. done clear
  B)
  It decreases. done clear
  C)
  It remains the same. done clear
  D)
         It either increases or decreases.  4 done clear
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• question_answer26)
  Which of the following is a chemical change?
  A)
   Explosion of crackers done clear
  B)
   Magnetization of iron done clear
  C)
   Charging of a battery done clear
  D)
   Both (B) and (C) done clear
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• question_answer27)
  When an iron bar of length 12 cm is magnetized, its length was found to have increased. What happens to its mass?
  A)
   It increases. done clear
  B)
   It decreases. done clear
  C)
   It remains the same. done clear
  D)
   It cannot be explained. done clear
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• question_answer28)
  Which of the following will be true of 'ash? that is obtained by burning wood in air?
  A)
   Some properties of ash will not be similar to wood. done clear
  B)
   The properties of ash will be similar to wood. done clear
  C)
   The properties of ash will be different from both wood and air. done clear
  D)
   The properties of ash will be similar to both wood and air. done clear
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• question_answer29)
  Which of the following is a physical change?
  A)
   The rusting of iron nails done clear
  B)
   The burning of diesel done clear
  C)
   Breaking of a glass bottle done clear
  D)
   The heating of iron with sulphur done clear
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• question_answer30)
  Which of the following changes caused by heating a substance is irreversible?
  A)
   Change in size done clear
  B)
   Change in state done clear
  C)
   Change in colour done clear
  D)
   Change in substance done clear
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• question_answer31)
  What change is observed when a piece of magnesium wire is burnt?
  A)
   Physical change done clear
  B)
   Chemical change done clear
  C)
   Nuclear change done clear
  D)
   Both (A) and (B) done clear
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• question_answer32)
  Observe the following figures. Identify the type of change.
  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_answer33)
  Which of the following suffers maximum damage due to the rusting of iron?
  A)
                           2                                             done clear
  B)
   1                             done clear
  C)
                   3                             done clear
  D)
          4 done clear
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• question_answer34)
  Read the following statements carefully and then select the correct answer.

  1. An Iron ball which can pass through a ring easily may not do so when heated.

  2. When seeds are soaked in water, they absorb water and grow bigger.

  A)
   Both the statements 1 and 2 indicate physical changes.                done clear
  B)
   Both the statements 1 and 2 indicate chemical changes.               done clear
  C)
   Statement 1 shows a physical change while statement 2 shows a chemical change. done clear
  D)
   Statement 1 shows a chemical change while statement 2 shows a physical change. done clear
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• question_answer35)
  What change takes place when a boy kicks a football?
  A)
   Exothermic reaction done clear
  B)
   Endothermic reaction done clear
  C)
   Physical change done clear
  D)
   Chemical change done clear
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• question_answer36)
  Three substances given below are kept in the open for a few days. Which of them will undergo a chemical change?
  A)
   Eggs done clear
  B)
   Plastic bottle done clear
  C)
   Both eggs and moth balls done clear
  D)
   Eggs, plastic bottle and moth balls done clear
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• question_answer37)
  Karuna wrapped some green gram pulses in a wet cotton cloth and when she observed them after a couple of days, she found small white growths on them. What could be this change?
  A)
   Physical change done clear
  B)
   Temporary change done clear
  C)
   Chemical change done clear
  D)
   Periodic change done clear
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• question_answer38)
  On sprinkling salt on an ice cube, it starts melting. What change does the cube of ice undergo?
  A)
   Physical change done clear
  B)
   Chemical change done clear
  C)
   Molecular change done clear
  D)
   Permanent change done clear
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• question_answer39)
  Which of the following changes does food in a refrigerator undergo?
  A)
   Slow, physical change done clear
  B)
   Slow, chemical change done clear
  C)
   Fast, chemical change done clear
  D)
   Fast, physical change done clear
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• question_answer40)
  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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