12th Class Physics Electric Charges and Fields Question Bank

done Case Based (MCQs) - Electric Charges and Fields Total Questions - 10

• question_answer1)

  Direction: Q. 1 to 5

  Read the following text and answer the following questions on the basis of the same:

  Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the encloser is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.

  Which of the following material can be used to make a Faraday cage?
  A)
  Plastic done clear
  B)
  Glass done clear
  C)
  Copper done clear
  D)
  Wood done clear
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• question_answer2)
  Example of a real-world Faraday cage is :
  A)
  car done clear
  B)
  plastic box done clear
  C)
  lighting rod done clear
  D)
  metal rod done clear
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• question_answer3)
  What is the electrical force inside a Faraday cage when it is struck by lightning?
  A)
  The same as the lightning done clear
  B)
  Half that of the lightning done clear
  C)
  Zero done clear
  D)
  A quarter of the lightning done clear
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• question_answer4)
  If isolated point charge +q is placed inside the Faraday cage. Its surface must have charge equal to:
  A)
  Zero done clear
  B)
  +q done clear
  C)
  -q done clear
  D)
  +2q done clear
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• question_answer5)
  A point charge of 2 C is placed at centre of Faraday cage in the shape of cube with surface of 9 cm edge. The number of electric field lines passing through the cube normally will be :
  A)
  \[1.9\ \times \ 1{{0}^{5}}\ N{{m}^{2}}/C\] entering the surface. done clear
  B)
  \[1.9\ \times \ 1{{0}^{5}}\ N{{m}^{2}}/C\] leaving the surface. done clear
  C)
  \[2.0\ \times \ 1{{0}^{5}}\ N{{m}^{2}}/C\] leaving the surface. done clear
  D)
  \[2.0\ \times \ 1{{0}^{5}}\ N{{m}^{2}}/C\] entering the surface. done clear
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• question_answer6)

  Direction: Q. 6 to 10

  Read the following text and answer the following questions on the basis of the same:

  Tribo-electric series:

  The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons.

  In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electron. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.

  Materials in the upper position has ___ tendency to become positively charged.
  A)
  low done clear
  B)
  high done clear
  C)
  no done clear
  D)
  medium done clear
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• question_answer7)
  Name two materials which do not have a strong tendency to give up or accept electrons.
  A)
  Ebonite, Nylon done clear
  B)
  Plastic wrap, Teflon done clear
  C)
  Nylon, cat fur done clear
  D)
  Steel, wood done clear
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• question_answer8)
  If human hair is rubbed with amber, how those will be charged?
  A)
  Both negative done clear
  B)
  Both positive done clear
  C)
  Hair will be positively charged. Amber will be negatively charged. done clear
  D)
  Hair will be negatively charged. Amber will be positively charged. done clear
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• question_answer9)
  Tribo-electric charging is the process of electron transfer between two objects
  A)
  By contact done clear
  B)
  Without contact done clear
  C)
  By any one of the above done clear
  D)
  By none of the above done clear
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• question_answer10)
  The object which loses electron becomes charged and the object gains electron becomes charged.
  A)
  negatively, negatively done clear
  B)
  positively, positively done clear
  C)
  positively, negatively done clear
  D)
  negatively, positively done clear
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