8th Class Science Chemical Effects of Electric Current Question Bank

done Chemical Effects of Electric Current Total Questions - 35

• question_answer1)
  What is current?
  A)
   The flow of matter done clear
  B)
                          The flow of electrons done clear
  C)
                          The flow of protons done clear
  D)
                          The flow of charge done clear
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• question_answer2)
  In electrolytic solutions, which of the following acts as carrier of charge?
  A)
   Protons                               done clear
  B)
                          Electrons                            done clear
  C)
                          Neutrons                            done clear
  D)
                          Ions                      done clear
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• question_answer3)
  What are insulators?
  A)
   Materials that conduct electricity done clear
  B)
                          Materials that do not conduct electricity done clear
  C)
                          Materials that conduct electricity only at low temperatures done clear
  D)
                          Materials that conduct electricity at room temperature done clear
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• question_answer4)
  Which of the following is an insulator?
  A)
   Wood                                   done clear
  B)
                          Iron                       done clear
  C)
                          Graphite                             done clear
  D)
                          Silver done clear
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• question_answer5)
  Which of the following circuits gives the correct way of connecting an LED to light it up?
  A)
                                                                        done clear
  B)
                         done clear
  C)
                                                                                 done clear
  D)
                                         done clear
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• question_answer6)
  Which of the following energy conversions takes place in a cell?
  A)
   Electrical energy into chemical energy done clear
  B)
                          Chemical energy into electrical energy done clear
  C)
                          Magnetic energy into electrical energy done clear
  D)
                          Electrical energy into mechanical energy done clear
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• question_answer7)
  Which of the following are the characteristics of an electrolyte?
  A)
   It has a positive charge. done clear
  B)
                          It has a negative charge. done clear
  C)
                          It conducts charge without dissociating. done clear
  D)
                          It forms positive and negative ions. done clear
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• question_answer8)
  Which acid is present in lemon juice that acts as an electrolyte?
  A)
   Sulphuric acid done clear
  B)
                          Nitric acid done clear
  C)
                          Hydrochloric acid done clear
  D)
                          Citric acid done clear
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• question_answer9)
  Which of the following is the electrolyte in a dry cell?
  A)
   Copper sulphate done clear
  B)
                          Zinc sulphate done clear
  C)
                          Sulphuric acid done clear
  D)
                          Ammonium chloride done clear
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• question_answer10)
  In a dry cell, which of the following acts as the positive terminal?
  A)
   Carbon rod done clear
  B)
                          Manganese dioxide done clear
  C)
                          Manganese dioxide and powdered carbon done clear
  D)
                          A metal cap on the carbon rod done clear
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• question_answer11)
  What is the common voltage produced by a dry cell?
  A)
   1.5 V                                     done clear
  B)
                          30 V                      done clear
  C)
                          60 V                                      done clear
  D)
                          3 V done clear
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• question_answer12)
  What happens when electric current is made to flow through a conductor?
  A)
   Some amount of electrical energy is converted into heat energy. done clear
  B)
                          Some amount of electrical energy is converted into mechanical energy. done clear
  C)
                          Some amount of mechanical energy is converted into electrical energy. done clear
  D)
                          Some amount of heat energy is converted into electrical energy. done clear
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• question_answer13)
  Nichrome is an alloy. Which of the following metals make up this alloy?
  A)
   Nickel and chromium done clear
  B)
                          Nitrogen and chromium done clear
  C)
                          Nitrogen, chlorine and chromium done clear
  D)
                          Nickel, chromium and manganese done clear
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• question_answer14)
  What is the splitting of a compound using electricity called?
  A)
   Electrolysis done clear
  B)
                          Electrolyte done clear
  C)
                          Electrokinesis done clear
  D)
                          Electrochemistry done clear
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• question_answer15)
  What is the principle involved in the glowing of an electric bulb?
  A)
   Magnetic effect of current done clear
  B)
                          Heating effect of current done clear
  C)
                          Chemical effect done clear
  D)
                          Conduction of current done clear
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• question_answer16)
  Why are LED?s extensively used to replace bulbs?  

  (i) Consume less electricity

  (ii) Have longer life

  (iii) Have more power

  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_answer17)
  Which of the following is the best conductor of electricity?
  A)
   Tap water           done clear
  B)
                          Distilled water                  done clear
  C)
                          Sea water           done clear
  D)
                          Rain water done clear
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• question_answer18)
  Which of the following effects of current is responsible for the deflection of a compass needle in an electric field?
  A)
   Heating effect of current done clear
  B)
                          Magnetic effect of current done clear
  C)
                          Conducting effect of heat done clear
  D)
                          Chemical effect of current done clear
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• question_answer19)
  Which of these is the industrial applications of the chemical effects of electric current?
  A)
   Electroplating done clear
  B)
                          Galvanizing done clear
  C)
                          Anodizing done clear
  D)
                          All of the above done clear
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• question_answer20)
  Which of the following liquids is a bad conductor of electricity?
  A)
   Lemon juice done clear
  B)
                          Vinegar done clear
  C)
                          Sea water done clear
  D)
                          Distilled water done clear
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• question_answer21)
  Cans used for storing food are electroplated. What is the material used for electroplating?
  A)
   Chrome onto tin done clear
  B)
                          Iron onto tin done clear
  C)
                          Tin onto iron done clear
  D)
                          Chrome onto iron done clear
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• question_answer22)
  What is iron coated with in order to protect it from corrosion and rust?
  A)
   Tin                                         done clear
  B)
                          Copper                                done clear
  C)
                          Zinc                                       done clear
  D)
                          Mercury done clear
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• question_answer23)
  Why is zinc better than tin for electro- plating a piece of iron in order to prevent it from rusting?
  A)
   Zinc is cheaper than tin. done clear
  B)
                          Tin is toxic. done clear
  C)
                          Zinc can prevent iron from coming into contact with water and air. done clear
  D)
                          Rusting is prevented even when the zinc layer is broken. done clear
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• question_answer24)
  Which of the following statements is correct?
  A)
   Distilled water is a good conductor of electricity. done clear
  B)
                          An LED glows even when a weak electric current flows through it. done clear
  C)
                          Only hydrated salt solutions conduct electricity. done clear
  D)
                          Zinc plating is done to make the object scratch proof. done clear
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• question_answer25)
  ?X? is a good conductor of electricity. Which of the following could be ?X??
  A)
   Solid sodium chloride done clear
  B)
                          Vinegar done clear
  C)
                          Distilled water done clear
  D)
                          Liquid oxygen done clear
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• question_answer26)
  In a cell, by convention, from where does the charge seem to be flowing through?
  A)
   From positive electrode to negative electrode done clear
  B)
                          From negative electrode to positive electrode done clear
  C)
                          Both (A) and (B) done clear
  D)
                          Cannot be said done clear
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• question_answer27)
  Why are metals good conductors of electricity?
  A)
   In metals/outer electrons are strongly bound to the atom. done clear
  B)
                          In metals, outer electrons are loosely bound to the atom. done clear
  C)
                          In metals, inner electrons are loosely bound to the atom. done clear
  D)
                          In metals, protons can detach from the nucleus and conduct electricity. done clear
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• question_answer28)
  Why are cans used for storing soft drinks or food items usually electroplated with tin?
  A)
   Tin is less reactive than the metal the can is made of. done clear
  B)
                          Tin is cheap. done clear
  C)
                          Tin is strong and shiny in appearance done clear
  D)
                          Tin is lighter than other metals. done clear
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• question_answer29)
  A During the electrolysis of \[\text{CuS}{{\text{O}}_{\text{4}}}\]solution, sulphate ions move towards the
  A)
   copper electrode. done clear
  B)
                          anode. done clear
  C)
                          cathode. done clear
  D)
                          zinc electrode. done clear
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• question_answer30)
  A bulb does not glow when the probe are hanging in air. Why?
  A)
   Air absorbs electricity. done clear
  B)
                          Air is a bad conductor of electricity. done clear
  C)
                          Electricity is discharged into air. done clear
  D)
                          Air disperses electricity. done clear
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• question_answer31)
  Iron vessels are coated with tin to
  A)
   give better shining. done clear
  B)
                          increase the strength. done clear
  C)
                          increase weight. done clear
  D)
                          prevent rusting. done clear
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• question_answer32)
  Observe the given figure. What is the purpose of this experimental setup?
  A)
   To check the conductivity of copper sulphate solution. done clear
  B)
                          To get iron electroplated. done clear
  C)
                          To check the continuity of charge flow in the circuit. done clear
  D)
                          To make the electric bulb glow. done clear
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• question_answer33)
  A What is the process of depositing a layer of a desired metal on another material by passing electric current called?
  A)
   Electrolysis done clear
  B)
                          Electroplating done clear
  C)
                          Chromium plating done clear
  D)
                          Galvanizing done clear
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• question_answer34)
  A Which of the following statements is NOT correct?
  A)
   The ions are free to move about in an electrolyte. done clear
  B)
                          The solution which can form ions is used for electroplating. done clear
  C)
                          Acids are bad conductors of electricity. done clear
  D)
                          An electric bulb glows due to the heating effect of current. done clear
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• question_answer35)
  The charges present on the various objects are shown below in the figure. In which of the following cases does a force of repulsion act between them?
  A)
                                                                    done clear
  B)
                         done clear
  C)
                                                                                            done clear
  D)
                         done clear
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