Railways General Science & Technology Electrostatics & Capacitance Sample Paper

done Electrostatics Sample Test Paper-8 Total Questions - 20    [Download]

• question_answer1)
  If a body is positively charged, then it has
  A)
   Excess of electrons   
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  B)
        Excess of protons
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  C)
   Deficiency of electrons 
  done clear
  D)
   Deficiency of neutrons
  done clear
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• question_answer2)
  Among identical spheres A and B having charges as \[-\,5C\] and \[-\,16C\]
  A)
   \[-\,5C\] is at higher potential
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  B)
   \[-\,16C\] is at higher potential
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  C)
   Both are at equal potential
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  D)
   It cannot be said
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• question_answer3)
  Which of the following is best insulator?
  A)
   Carbon
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  B)
   Paper
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  C)
   Graphite          
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  D)
   Ebonite
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• question_answer4)
  If body is charged by rubbing it, its weight
  A)
   remains precisely constant
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  B)
   Increases slightly
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  C)
   Decreases slightly
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  D)
   May increase slightly or may decrease slightly
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• question_answer5)
  A comb run through one's dry hair attracts small bits of paper. This is due to
  A)
   Comb is a good conductor
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  B)
   Paper is a good conductor
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  C)
   The atoms in the paper get polarised by the charged comb
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  D)
   The comb possesses magnetic properties
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• question_answer6)
  The charge given to any conductor resides on its outer surface, because
  A)
   The free charge tends to be in its minimum potential energy state
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  B)
   The free charge tends to be in its minimum kinetic energy state
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  C)
   The free charge tends to be in its maximum potential energy state
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  D)
   The free charge tends to be in its maximum kinetic energy state
  done clear
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• question_answer7)
  Capacitors are used in electrical circuits where appliances need more
  A)
   Current
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  B)
   Voltage
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  C)
   Watt               
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  D)
   Resistance
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• question_answer8)
  When a lamp is connected in series with capacitor, then
  A)
   Lamp will not glow
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  B)
   Lamp will burst out
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  C)
   Lamp will glow normally
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  D)
   None of these
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• question_answer9)
  The net charge on capacitor is
  A)
   2q                   
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  B)
   q/2
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  C)
   0                    
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  D)
   \[\infty \]
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• question_answer10)
  Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be
  A)
   Zero
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  B)
   Greater than in copper
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  C)
   Equal to that in copper
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  D)
   Less than in copper
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• question_answer11)
  One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
  A)
   Mass of A and mass of B still remain equal
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  B)
   Mass of A increases
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  C)
   Mass of B decreases
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  D)
   Mass of B increases
  done clear
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• question_answer12)
  There are two metallic spheres of same radii but one is solid and the other is hollow, then
  A)
   Solid sphere can be given more charge
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  B)
   Hollow sphere can be given more charge
  done clear
  C)
   They can be charged equally (Maximum)
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  D)
   None of the above
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• question_answer13)
  A soap bubble is given a negative charges then its radius
  A)
   Decreases
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  B)
   Increases
  done clear
  C)
   Remains unchanged
  done clear
  D)
   Nothing can be predicted as information is insufficient
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• question_answer14)

  Four metal conductors having difference shapes

  1. A sphere

  2. Cylindrical

  3. Pear

  4. Lighting conductor are mounted on insulating sands and charged.

  The one which is best suited to retain the charges for a longer time is

  A)
   1                    
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  B)
   2
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  C)
   3                    
  done clear
  D)
   4
  done clear
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• question_answer15)
  When a body is earth connected, electrons from the earth flow into the body. This means the body is
  A)
   Unchanged       
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  B)
   Charged positively
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  C)
   Charged negatively
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  D)
   an insulator
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• question_answer16)
  Electric potential of earth is taken to be zero because earth is a good
  A)
   Insulator          
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  B)
   conductor
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  C)
   Semiconductor
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  D)
   Dielectric
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• question_answer17)
  An uncharged capacitor is connected to a battery. On charging the capacitor
  A)
   All the energy supplied is stored in the capacitor
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  B)
   Half the energy supplied is stored in the capacitor
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  C)
   The energy stored depends upon the capacity of the capacitor only
  done clear
  D)
   The energy stroed depends upon the time for which the capacitor is charged.
  done clear
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• question_answer18)
  When we touch the terminals of a high voltage capacitor, even after a high voltage has been cut off, then the capacitor has a tendency to
  A)
   Restore energy
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  B)
   Discharge energy
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  C)
   Affect dangerously
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  D)
   both [b] and [c]
  done clear
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• question_answer19)
  In nature, the electric charge of any system is always equal to
  A)
   Half integral multiple of the least amount of charge
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  B)
   Zero
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  C)
   Square of the least amount of charge
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  D)
   Integral multiple of the least amount of charge
  done clear
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• question_answer20)
  Consider two point charges of equal magnitude and opposite sign separated by a certain distance. The neutral point between them
  A)
   Does not exist
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  B)
   Will be in midway between them
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  C)
   Lies on the perpendicular bisector of the line joining the two
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  D)
   Will be closer to the negative charge.
  done clear
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