7th Class Science Electric Current and Its Effects Question Bank

done Self Test-11 Total Questions - 10

• question_answer1)
  The wire used in a fuse has
  A)
   High melting point done clear
  B)
   Low melting point done clear
  C)
   Average melting point done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer2)
  On which one of the following effects of electric current the electric bulb works?
  A)
   Heating effect of current done clear
  B)
   Magnetic effect of current done clear
  C)
   Chemical effect of current done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer3)
  Why only iron is used for making electromagnet; not steel, nickel, cobalt?
  A)
   Because iron is cheep and easily available done clear
  B)
   Because iron is a good conductor of electricity done clear
  C)
   Because when current is switched off in the coil of an electromagnet made of iron, iron loses all its magnetism done clear
  D)
   Because iron is a temporary magnet done clear
  E)
   None of these done clear
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• question_answer4)
  Which one of the following phenomenon occurs when two naked wires of electricity supply line touch each other?
  A)
   Overloading done clear
  B)
   Short circuiting done clear
  C)
   Lightening done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer5)
  The electric fuse work on which one of the following phenomenon?
  A)
   Chemical effect of current done clear
  B)
   Magnetic effect of current done clear
  C)
   Heating effect of current done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer6)
  On which one of the following the resistance of wire depends?
  A)
   Length of the wire done clear
  B)
   Thickness of the wire done clear
  C)
   Nature of the wire done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer7)
  In which one of the following conditions, amount of heat produced in a current carrying wire, will increase?
  A)
   When amount of current passing in the wire is increased done clear
  B)
   When amount of current passing in the wire is decreased done clear
  C)
   When terminals of the are changed done clear
  D)
   All of these done clear
  E)
   None of these done clear
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• question_answer8)
  Which one of the following is the best conductor of electricity?
  A)
   Silver done clear
  B)
   Copper done clear
  C)
   Aluminum done clear
  D)
   Iron done clear
  E)
   None of these done clear
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• question_answer9)
  Magnetic effect of current was discovered by
  A)
   Thomas Jefferson done clear
  B)
   Hans Christian Oersted done clear
  C)
   Flemming done clear
  D)
   Louis Pasteur done clear
  E)
   None of these done clear
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• question_answer10)
  What is overloading?
  A)
   Touching of live wire with the neutral wire done clear
  B)
   Touching of live wire with the Earth wire done clear
  C)
   Touching of neutral wire with the earth wire done clear
  D)
   Drawing extremely large amount of current from the single house, hold circuit done clear
  E)
   None of these done clear
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