12th Class Physics Electric Charges and Fields Question Bank

done MCQs - Electric Charges and Fields Total Questions - 16

• question_answer1)
  Plastic rod rubbed with fur and glass rod rubbed with silk
  A)
  repel each other done clear
  B)
  mix up with each other done clear
  C)
  attract each other done clear
  D)
  None of the above done clear
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• question_answer2)
  Electric charge between two bodies can be produced by
  A)
  sticking done clear
  B)
  rubbing done clear
  C)
  oiling done clear
  D)
  passing AC current done clear
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• question_answer3)
  Electric charges under action of electric forces is called
  A)
  electrostatic done clear
  B)
  electric flux done clear
  C)
  electric field done clear
  D)
  electric field lines done clear
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• question_answer4)
  Law stating that "force is directly proportional to product of charges and inversely proportional to square of separation between them" is called
  A)
  Newton's law. done clear
  B)
  Coulomb's law done clear
  C)
  Gauss's law. done clear
  D)
  Ohm's law done clear
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• question_answer5)

  In given figure, two positive charges \[{{q}_{2}}\] and \[{{q}_{3}}\] fixed along the y axis, exert a net electric force in the + x direction on a charge \[{{q}_{1}}\] fixed along the x axis. If a positive charge Q is added at (x, 0), the force on \[{{q}_{1}}\]

  A)
  shall increase along the positive x-axis. done clear
  B)
  shall decrease along the positive x-axis. done clear
  C)
  shall point along the negative x-axis. done clear
  D)
  shall increase but the direction changes because of the intersection of Q with \[{{q}_{2}}\] and \[{{q}_{3}}\]. done clear
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• question_answer6)
  The magnitude of electric force, F is
  A)
  directly proportional to the multiplication of both charges. done clear
  B)
  directly proportional to the distance between both charges. done clear
  C)
  directly proportional to the square of the distance between both charges. done clear
  D)
  constant. done clear
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• question_answer7)
  A body is negatively charged means
  A)
  It has only negative charges. done clear
  B)
  Positive charges have been neutralized by negative charges. done clear
  C)
  The quantity of negative charge present is more than the quantity positive charge present. done clear
  D)
  The positive are displaced from their original positions. done clear
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• question_answer8)
  When a body is charged by conduction, its mass
  A)
  remains same. done clear
  B)
  increases. done clear
  C)
  decreases. done clear
  D)
  increase or decrease. done clear
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• question_answer9)

  A point positive charge is brought near an isolated conducting sphere in Figure. The electric field is best given by:

  A)
  Fig (i) done clear
  B)
  Fig (iii) done clear
  C)
  Fig (ii) done clear
  D)
  Fig (iv) done clear
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• question_answer10)
  A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is
  A)
  directed perpendicular to the plane and away from the plane. done clear
  B)
  directed perpendicular to the plane but towards the plane. done clear
  C)
  directed radially away from the point charge. done clear
  D)
  directed radially towards the point charge. done clear
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• question_answer11)
  A hemisphere is uniformly charged positively. The electric field at a point on a diameter away from the centre is directed
  A)
  perpendicular to the diameter. done clear
  B)
  parallel to the diameter, done clear
  C)
  at an angle tilted towards the diameter. done clear
  D)
  at an angle tilted away from the diameter. done clear
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• question_answer12)

  The electric flux through the surface :

  A)
  in Figure (iv) is the largest. done clear
  B)
  in Figure (iii) is the least. done clear
  C)
  in Figure (ii) is same as Figure (iii) but is smaller than Figure (iv). done clear
  D)
  is the same for all the figures. done clear
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• question_answer13)

  Figure shows electric field lines in which an electric dipole p is placed as shown. Which of the following statements is correct?

  A)
  The dipole will not experience any force. done clear
  B)
  The dipole will experience a force towards right. done clear
  C)
  The dipole will experience a force towards left done clear
  D)
  The dipole will experience a force upwards. done clear
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• question_answer14)

  Five charges \[{{q}_{1}},{{q}_{2}},{{q}_{3}},{{q}_{4}}\], and \[{{q}_{5}}\] are fixed at their positions as shown in Figure. S is a Gaussian surface. The Gauss's law is given by:

  Which of the following statements is correct?

   
  A)
  E on the LHS of the above equation will have a contribution from \[{{q}_{1}},{{q}_{5}}\],and \[{{q}_{3}}\], while q on the RHS will have a contribution from \[{{q}_{2}}\] and \[{{q}_{4}}\] only. done clear
  B)
  E on the LHS of the above equation will have a contribution from all charges, while q on the RHS will have a  contribution from \[{{q}_{2}}\] and \[{{q}_{4}}\] only. done clear
  C)
  E on the LHS of the above equation will have a contribution from all charges, while q on the RHS will have a contribution from \[{{q}_{2}}\] and \[{{q}_{4}}\] only. done clear
  D)
  Both E on the LHS and q on the RHS will have contributions from \[{{q}_{2}}\] and \[{{q}_{4}}\] only. done clear
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• question_answer15)
  The Electric field at a point is
  A)
  always discontinuous. done clear
  B)
  discontinuous if there is a positive charge at that point. done clear
  C)
  discontinuous only if there is a negative charge at that point. done clear
  D)
  discontinuous if there is a charge at that point. done clear
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• question_answer16)
  If there is only one type of charge in the universe, then
  A)
  \[\oint{E.ds\ne 0}\] on any surface. done clear
  B)
  \[\oint{E.ds={{\varepsilon }_{0}}/q}\] if the charge is outside the surface. done clear
  C)
  \[\oint{E.ds}\] connot not be defined. done clear
  D)
  \[\oint{E.ds=q/{{\varepsilon }_{0}}}\] if charges of magnitude q is inside the surface. done clear
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