Banking Physics Electricity and Circuits Question Bank

done Electricity Total Questions - 58

• question_answer1)
  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 done clear
  B)
  the free charge tends to be in its minimum kinetic energy state done clear
  C)
  the free charge tends to be in its maximum potential energy state. done clear
  D)
  the free charge tends to be in its maximum kinetic energy state done clear
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• question_answer2)
  Two identical conducting balls having positive charges \[{{q}_{1}}\] and \[{{q}_{2}}\]are separated by a distance r. If they are made to touch each other and then separated to the same distance, the force between them will be
  A)
   less than before              done clear
  B)
   same as before done clear
  C)
   more than before   done clear
  D)
          zero done clear
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• question_answer3)
  Potential at any point inside a charged hollow sphere
  A)
   increases with distance done clear
  B)
   is a constant   done clear
  C)
   decreases with distance from centre done clear
  D)
   is zero done clear
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• question_answer4)
  Three bulbs of 40 W, 60 W and 100 W are connected in series to a current source of 200 V. Which of the following statements is true?
  A)
   40 W bulb glows brightest   done clear
  B)
   60 W bulb glows brightest done clear
  C)
   100 W bulb glows brightest done clear
  D)
   All bulbs glow with same brightness done clear
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• question_answer5)
  A voltmeter essentially consists of
  A)
   a high resistance, in series with a galvanometer   done clear
  B)
   a low resistance, in series with a galvanometer done clear
  C)
   a high resistance in parallel with a galvanometer done clear
  D)
   a low resistance in parallel with a galvanometer done clear
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• question_answer6)
  Eddy currents are produced when
  A)
   a metal is kept in varying magnetic field   done clear
  B)
   a metal is kept in steady magnetic field done clear
  C)
   a circular coil is placed in a magnetic field done clear
  D)
   through a circular coil, current is passed done clear
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• question_answer7)
  An AC generator of 220V having internal resistance r =\[10\Omega \] and external resistance R =\[100\Omega \]. What is the power developed in the external circuit?
  A)
   484 W                          done clear
  B)
   400 W   done clear
  C)
   441 W              done clear
  D)
          369 W done clear
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• question_answer8)
  Choke coil works on the principle of
  A)
   transient current             done clear
  B)
   self-induction   done clear
  C)
   mutual induction  done clear
  D)
          watt less current done clear
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• question_answer9)
  In an a.c. circuit, the r.m.s. value of current, \[{{I}_{rms}}\]is related to the peak current, \[{{I}_{0}}\] by the relation
  A)
    \[{{I}_{rms}}=\sqrt{2{{I}_{0}}}\]                   done clear
  B)
   \[{{I}_{rms}}=\pi {{I}_{0}}\] done clear
  C)
    \[{{I}_{rms}}=\frac{1}{\pi }{{I}_{0}}\]        done clear
  D)
          \[{{I}_{rms}}=\frac{1}{\sqrt{2}}{{I}_{0}}\]   done clear
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• question_answer10)
  The frequency of A.C. mains in India is
  A)
   30c/s                            done clear
  B)
   50c/s   done clear
  C)
   60c/s                            done clear
  D)
   120c/s done clear
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• question_answer11)
  A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then bulb will
  A)
   give more intense light   done clear
  B)
   give less intense light done clear
  C)
   give light of same intensity before done clear
  D)
   stop radiating light done clear
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• question_answer12)
  In an A.C. circuit with voltage V and current I the power dissipated is
  A)
   \[\frac{1}{\sqrt{2}}VI\]              done clear
  B)
   \[\frac{1}{2}VI\] done clear
  C)
   VI done clear
  D)
   dependent on the phase between V and I   done clear
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• question_answer13)
  Alternating current cannot be measured by D.C. ammeter because
  A)
   average value of current for complete cycle is zero   done clear
  B)
   A.C. changes direction done clear
  C)
   A.C. cannot pass through D.C. ammeter done clear
  D)
   D.C. ammeter will get damaged done clear
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• question_answer14)
  The core of a transformer is laminated because
  A)
   the weight of the transformer may be reduced done clear
  B)
   rusting of the core may be prevented done clear
  C)
   ratio of voltage in primary and secondary may be increased done clear
  D)
   energy losses due to eddy currents may be  minimized   done clear
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• question_answer15)
  When a body is charged by induction, then the body
  A)
   becomes neutral done clear
  B)
   does not lose any charge   done clear
  C)
   loses whole of the charge on it done clear
  D)
   loses part of the charge on it done clear
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• question_answer16)
  If a body is positively charged, then it has
  A)
   excess of electrons done clear
  B)
   excess of protons done clear
  C)
   deficiency of electrons   done clear
  D)
   deficiency of neutrons done clear
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• question_answer17)
  On charging by conduction, mass of a body may
  A)
   increase                                    done clear
  B)
   decreases done clear
  C)
   increase or decrease   done clear
  D)
   none of these done clear
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• question_answer18)
  Coulomb's law is true for
  A)
   atomic distances (=\[{{10}^{-11}}m\]) done clear
  B)
   nuclear distances (=\[{{10}^{-15}}m\]) done clear
  C)
   charged as well as uncharged particles done clear
  D)
   all the distances   done clear
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• question_answer19)
  Which of the following is the best insulator of electricity?
  A)
   Carbon                         done clear
  B)
   Paper done clear
  C)
   Graphite             done clear
  D)
          Ebonite   done clear
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• question_answer20)
  Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging
  A)
   remains unaffected done clear
  B)
   mass of A > mass of B done clear
  C)
   mass of A< mass of B   done clear
  D)
   nothing can be said done clear
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• question_answer21)
  What happens when some charge is placed on a soap bubble?
  A)
   Its radius decreases                     done clear
  B)
   Its radius increases   done clear
  C)
   The bubble collapses done clear
  D)
   None of these done clear
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• question_answer22)
  If a body is charged by rubbing it, its weight
  A)
   remains precisely constant done clear
  B)
   increases slightly done clear
  C)
   decreases slightly done clear
  D)
   may increase slightly or may decrease slightly   done clear
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• question_answer23)
  Electric flux at a point in an electric field is
  A)
   positive                         done clear
  B)
   negative done clear
  C)
   zero                   done clear
  D)
          none of these done clear
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• question_answer24)
  The length of a wire is doubled and the radius is doubled. By what factor does the resistance change?
  A)
   4 times as large              done clear
  B)
   Twice as large done clear
  C)
   Unchanged         done clear
  D)
          Half as large   done clear
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• question_answer25)
  According to international convention of colour coding in a wire
  A)
    live is red, neutral is black and earth is green done clear
  B)
   live is red, neutral is green and earth is black done clear
  C)
   live is brown, neutral is blue and earth is black done clear
  D)
   live is red, neutral is black and earth is green   done clear
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• question_answer26)
  The resistivity of a wire depends on
  A)
   length               done clear
  B)
   area of cross-section done clear
  C)
   material              done clear
  D)
   all of these done clear
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• question_answer27)
  In the circuits shown below the ammeter Areads 4 amp. and the voltmeter V reads 20 volts. The value of the resistance R is
  A)
   slightly more than 5 ohms   done clear
  B)
   slightly less than 5 ohms done clear
  C)
   exactly 5 ohms done clear
  D)
   None of these done clear
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• question_answer28)
  Gases are good conductors of electricity at
  A)
   high pressure                 done clear
  B)
   low pressure   done clear
  C)
   low temperature             done clear
  D)
   high temperature done clear
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• question_answer29)
  The resistance of a thin wire in comparison of a thick, wire of the same material
  A)
   is low               done clear
  B)
   is equal done clear
  C)
   depends upon the metal of the wire done clear
  D)
   is high   done clear
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• question_answer30)
  Conductivity increases in the order of
  A)
   Al, Ag, Cu                    done clear
  B)
   Al, Cu, Ag   done clear
  C)
   Cu. Al, Ag         done clear
  D)
          Ag, Cu, Al done clear
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• question_answer31)
   Kilowatt-hour is the unit of
  A)
   potential difference         done clear
  B)
   electric power done clear
  C)
   electrical energy     done clear
  D)
          charge done clear
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• question_answer32)
  An electric bulb is filled with
  A)
   hydrogen          done clear
  B)
   oxygen and hydrogen done clear
  C)
   ammonia           done clear
  D)
   nitrogen and argon   done clear
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• question_answer33)
  When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because
  A)
   less current flows in the leading wire as compared to that in the filament done clear
  B)
   the leading wire has more resistance than the filament done clear
  C)
   the leading wire has less resistance than the filament   done clear
  D)
   filament has coating of fluorescent material over it done clear
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• question_answer34)
  From a power station, the power is transmitted at a very high voltage because -
  A)
   it is generated only at high voltage done clear
  B)
   it is cheaper to produce electricity at high voltage   done clear
  C)
   electricity at high voltage is less dangerous done clear
  D)
   there is less loss of energy in transmission at high voltage done clear
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• question_answer35)
  When a fuse is rated 8A, it means
  A)
   it will not work if current is less than 8A   done clear
  B)
   it has a resistance of 8 ohm done clear
  C)
   it will work only if current is 8A done clear
  D)
   it will burn if current exceeds 8A done clear
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• question_answer36)
  Fuse wire is made of
  A)
   platinum                       done clear
  B)
   copper done clear
  C)
   aluminum            done clear
  D)
          alloy of tin and lead done clear
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• question_answer37)
  Which is not a device based on the heating effect of electricity?
  A)
   Heater                          done clear
  B)
   Toaster   done clear
  C)
   Refrigerator         done clear
  D)
          Press done clear
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• question_answer38)
  The primary cell which is used in daily life is
  A)
   Leclanche cell                done clear
  B)
   Dry cell done clear
  C)
   Daniel cell             done clear
  D)
          Simple voltaic cell done clear
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• question_answer39)
  The filament of an electric bulb is of tungsten because
  A)
   its resistance is negligible done clear
  B)
   it is cheaper done clear
  C)
   its melting point is high   done clear
  D)
   filament is easily made done clear
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• question_answer40)
  Which one of the following heater element is used in electric press?
  A)
   Copper wire                     done clear
  B)
   Nichrome wire done clear
  C)
   Lead wire          done clear
  D)
   Iron wire done clear
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• question_answer41)
  What should be the characteristic of fuse wire?
  A)
   High melting point, high specific resistance done clear
  B)
   Low melting point, low specific resistance done clear
  C)
   High melting point, low specific resistance done clear
  D)
   Low melting point, high specific resistance   done clear
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• question_answer42)
  The heating element of an electric heater should be made with a material, which should have
  A)
   high specific resistance and high melting point   done clear
  B)
   high specific resistance and low melting point done clear
  C)
   low specific resistance and low melting point done clear
  D)
   low specific resistance and high melting point done clear
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• question_answer43)
   In charging a battery of motor car, the following effect of electric current is used
  A)
   magnetic                       done clear
  B)
   heating done clear
  C)
   chemical              done clear
  D)
          induction done clear
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• question_answer44)
  For electroplating a spoon, it is placed in the voltameter at
  A)
   the position of anode done clear
  B)
   the position of cathode   done clear
  C)
   exactly in the middle of anode and cathode done clear
  D)
   anywhere in the electrolyte done clear
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• question_answer45)
  Electroplating does not help in
  A)
   fine finish to the surface done clear
  B)
   shining appearance done clear
  C)
   metals to become hard   done clear
  D)
   protect metals against corrosion done clear
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• question_answer46)
  Faraday's laws are consequence of conservation of
  A)
   energy   done clear
  B)
   energy and magnetic field done clear
  C)
   charge done clear
  D)
   magnetic field done clear
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• question_answer47)
  Lenz's law is a consequence of the law of conservation of
  A)
   charge             done clear
  B)
   mass done clear
  C)
   energy               done clear
  D)
          momentum done clear
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• question_answer48)
  The laws of electromagnetic induction have been used in the construction of a
  A)
   galvanometer                done clear
  B)
   voltmeter done clear
  C)
   electric motor       done clear
  D)
         generator   done clear
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• question_answer49)
  Whenever, current is changed in a coil, an induced e.m.f. is produced in the same coil. This property of the coil is due to
  A)
   mutual induction            done clear
  B)
   self-induction   done clear
  C)
   eddy currents       done clear
  D)
          hysteresis done clear
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• question_answer50)
  Alternating current is converted to direct current by
  A)
   rectifier                           done clear
  B)
   dynamo done clear
  C)
   transformer          done clear
  D)
          motor done clear
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• question_answer51)
  To convert mechanical energy into electrical energy, one can use
  A)
   DC dynamo                  done clear
  B)
   AC dynamo done clear
  C)
   motor             done clear
  D)
          [a] & [b]   done clear
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• question_answer52)
  Transformers are used
  A)
   in DC circuits only          done clear
  B)
   in AC circuits only   done clear
  C)
   in both DC and AC circuits done clear
  D)
   neither in DC nor in AC circuits done clear
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• question_answer53)
  The essential difference between an AC generator and a DC generator is that
  A)
   AC generator has an electromagnet while a DC generator has permanent magnet done clear
  B)
   DC generator will generate a higher voltage done clear
  C)
   AC generator will generate a higher voltage done clear
  D)
   AC generator has slip rings while the DC generator has a commutate or   done clear
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• question_answer54)
  At the time of short circuit, the current in the circuit
  A)
   reduces substantially       done clear
  B)
   does not change done clear
  C)
   increases heavily              done clear
  D)
   vary continuously done clear
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• question_answer55)
  In an electric motor, conversion takes place of
  A)
   chemical energy into electrical energy done clear
  B)
   electrical energy into mechanical energy   done clear
  C)
   electrical energy into light energy done clear
  D)
   electrical energy into chemical energy done clear
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• question_answer56)
  The current in a generator armature is AC because
  A)
   the magnetic field reverses at intervals done clear
  B)
   the current in the field coils is AC done clear
  C)
   the rotation of the armature causes the field through it to reverse   done clear
  D)
   the commutator feeds current into it in opposite directions at every half cycle done clear
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• question_answer57)
  The current in the armature of a motor is reversed at every half cycle due to the action of a (n)
  A)
   armature                       done clear
  B)
   field coil done clear
  C)
   brush              done clear
  D)
          commutator   done clear
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• question_answer58)
  For dynamo which one of the following statements is correct?
  A)
   It converts the electrical energy into light energy done clear
  B)
   It converts the kinetic energy into heat energy done clear
  C)
   It converts the mechanical energy into electrical energy   done clear
  D)
   It converts the electrical energy into mechanical energy done clear
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