10th Class Science Magnetic Effects of Electric Current Question Bank

done Electricity and Magnetic Effects of Electric Current Total Questions - 40

• question_answer1)
  How much work is done in moving a charge of 4 coulombs from a point at 110 volts to a point at 120 volts?
  A)
  20 Joules                       done clear
  B)
  40 Joules   done clear
  C)
  40 Newton                     done clear
  D)
  20 Newton done clear
  E)
  None of these done clear
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• question_answer2)
  Which of the following is the work done in moving a unit charge across two points in an electric circuit?
  A)
  Current              done clear
  B)
  Potential difference done clear
  C)
  Power                done clear
  D)
  Resistance done clear
  E)
  None of these done clear
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• question_answer3)
  Which of the following will have higher number of free electrons?         
  A)
  Nichrome                       done clear
  B)
  Copper done clear
  C)
  Constantan                    done clear
  D)
  Glass done clear
  E)
  None of these done clear
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• question_answer4)
  How much electrons should pass through a conductor in 1 second to constitute 1 ampere current, if the charge on an electron is 1.6 x 10'19 coulombs?
  A)
  \[6.25\times {{10}^{18}}\] electrons done clear
  B)
  \[6.9\times {{10}^{18}}\] electrons done clear
  C)
  \[6.5\times {{10}^{19}}\] electrons done clear
  D)
  \[6.25\times {{10}^{15}}\] electrons done clear
  E)
  None of these done clear
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• question_answer5)
  What is the resistance between two points of wire carrying 4 ampere current and has potential difference of 0.2 volt?
  A)
  0.04 Ohm                      done clear
  B)
  0.02 Ohm   done clear
  C)
  0.05 Ohm          done clear
  D)
  0.06 Ohm done clear
  E)
  None of these done clear
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• question_answer6)
  What current will a bulb draw when connected to 110 V supply line, if the bulb draws a current of 2 A from the 220 V supply line?
  A)
  2 A                               done clear
  B)
  3 A done clear
  C)
  4 A                               done clear
  D)
  1 A done clear
  E)
  None of these done clear
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• question_answer7)
  What is the potential difference between the ends of a conductor of 60 Ohm resistance, when a current of 4 A flows through it?
  A)
  200 V                       done clear
  B)
  240 V done clear
  C)
  180 V                  done clear
  D)
       150 V done clear
  E)
  None of these done clear
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• question_answer8)
  What will be the resistance of a resistor when a 24 V battery is connected across an unknown resistor and there is a current of 2.5 m A is flowing in the circuit?
  A)
  \[9.6\times {{10}^{3}}\] ohms   done clear
  B)
  \[9.4\times {{10}^{3}}\] ohms done clear
  C)
  \[9.6\times {{10}^{6}}\]ohms    done clear
  D)
  \[9.2\times {{10}^{6}}\]ohms done clear
  E)
  None of these done clear
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• question_answer9)
  What is the resistivity of copper, if the copper wire of length 3 m and area of cross-section is \[1.6\times {{10}^{-4}}{{m}^{2}}\] has a resistance of \[3\times {{10}^{-2}}\] Ohms?
  A)
  \[1.4\times {{10}^{-6}}\] Ohm-metre done clear
  B)
  \[1.6\times {{10}^{-6}}\] Ohm-metre done clear
  C)
  \[1.6\times {{10}^{-4}}\] Ohm-metre done clear
  D)
  \[1.6\times {{10}^{-2}}\] Ohm-metre done clear
  E)
  None of these done clear
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• question_answer10)
  What will be the length of wire to make its resistance of 15 ohms, if copper wire has a diameter of 1 mm and resistivity of \[1.5\times {{10}^{-8}}\] ohm metre?
  A)
  700 m               done clear
  B)
  785.7 m done clear
  C)
  600 m                           done clear
  D)
  685.7 m done clear
  E)
  None of these done clear
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• question_answer11)
  Magnetic field lines due to a straight wire carrying current are:
  A)
  Straight             done clear
  B)
  Concentric circles done clear
  C)
  Parabolic                       done clear
  D)
  Elliptical done clear
  E)
  None of these done clear
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• question_answer12)
  Magnetic field lines inside a long current carrying solenoid are:
  A)
  Straight done clear
  B)
  Circular done clear
  C)
  Parabolic                       done clear
  D)
  Elliptical done clear
  E)
  None of these done clear
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• question_answer13)
  An AC generator is connected to an electric appliance. In 10 revolutions of the armature, the current in the appliance changes direction:
  A)
  5 times              done clear
  B)
  10 times done clear
  C)
  20 times done clear
  D)
  30 times done clear
  E)
  None of these done clear
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• question_answer14)
  A device that can be used to produce an electric current in a circuit is a/an:
  A)
  Ammeter                       done clear
  B)
  Motor done clear
  C)
  Generator          done clear
  D)
  Galvanometer done clear
  E)
  None of these done clear
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• question_answer15)
  Which of the following statements is incorrect?

  (i) Resistance of a wire increases with the increase in the length of a wire.

  (ii) A thick wire has more resistance than a thin wire.

  (iii) Resistance decreases with increase in temperature.

  (iv) Ohm is the unit of resistance.

  A)
  (i) and (ii)                       done clear
  B)
  (ii) and (iii) done clear
  C)
  (i) and (iii)                      done clear
  D)
  (i) and (iv) done clear
  E)
  None of these done clear
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• question_answer16)
  Which one of the following characteristics does not belong to parallel circuits?
  A)
  When one electrical appliance stops working then all other appliances keep working normally. done clear
  B)
  Each appliance gets the same voltage as that of the power supply line. done clear
  C)
  All the electrical appliances have only one switch and they cannot be turner on or off separately. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer17)
  By which of the following circuit diagrams we will get the resultant resistance of 6.4 ohm?
  A)
     done clear
  B)
    done clear
  C)
  done clear
  D)
  done clear
  E)
  None of these done clear
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• question_answer18)
  An electric fan runs from the 210 V mains. The current flowing through it is 3 A. At what rate is electrical energy transferred by the fan?
  A)
  90 J/S               done clear
  B)
  70 J/S done clear
  C)
  630 J/S      done clear
  D)
  630 done clear
  E)
  None of these done clear
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• question_answer19)
  The electrical resistivity of some substances are given below. Which of the following substances can be used to reduce the current in an electric circuit?
  A)
  \[0.6\times {{10}^{-8}}\] ohm metre done clear
  B)
  \[49\times {{10}^{-8}}\] ohm metre done clear
  C)
  \[1.6\times {{10}^{-8}}\] ohm metre done clear
  D)
  \[1.63\times {{10}^{-16}}\] ohm metre done clear
  E)
  None of these done clear
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• question_answer20)
  Two fuse wire X and Y of the same length are rated 25 A and 10 A. Which amongst the X and Y will be thicker?
  A)
  Wire X               done clear
  B)
  Wire Y done clear
  C)
  Both [a] and [b] done clear
  D)
  Either [a] or [b] done clear
  E)
  None of these done clear
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• question_answer21)
  When a current of 8 A flows through a resistor of 4 ohms for 30 minutes. Find the energy transferred.
  A)
  128 KWh                       done clear
  B)
  0.128 KWh done clear
  C)
  125 KWh                       done clear
  D)
  120 KWh done clear
  E)
  None of these done clear
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• question_answer22)
  An electric cooler is rated 6 KW. Electrical energy costs Rs. 4.5 per KWh. The cost of using the cooler for three hours is:
  A)
  Rs 60.5              done clear
  B)
  Rs 67.5     done clear
  C)
  Rs 70                            done clear
  D)
  Rs 75 done clear
  E)
  None of these done clear
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• question_answer23)
  The diagram given below shows a circuit containing a bulb B, a voltmeter V and an ammeter. The voltmeter reading is 5.6 volt and the ammeter reading is 7 ampere. Which of the following options is incorrect for the given circuit diagram?  
  A)
  The resistance of the bulb is 0.8 ohm metre. done clear
  B)
  The power of the bulb is 39.2 watt. done clear
  C)
  The resistance of the circuit is 0.8 ohm. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer24)
  Where the magnetic field is strongest in a bar magnet?
  A)
  At poles done clear
  B)
  At the centre done clear
  C)
  Between poles and centre done clear
  D)
  Either [a] or [b] done clear
  E)
  None of these done clear
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• question_answer25)
  The magnetic field lines produced by a current carrying solenoid is similar to magnetic field produced by a:
  A)
  Straight current carrying conductor done clear
  B)
  Bar Magnet done clear
  C)
  Electromagnet done clear
  D)
  Both [b] and [c] done clear
  E)
  None of these done clear
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• question_answer26)
  The magnetic effect of current was discovered by:
  A)
  Oersted  done clear
  B)
  Maxwell done clear
  C)
  Fleming                         done clear
  D)
  Faraday done clear
  E)
  None of these done clear
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• question_answer27)
  The magnitude of magnetic field will be maximum at which point in the given figure? 
  A)
  P                      done clear
  B)
  Q done clear
  C)
  R                                  done clear
  D)
  S done clear
  E)
  None of these done clear
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• question_answer28)
  Who among the following gave Left-hand rule for the direction of force?
  A)
  Fleming done clear
  B)
  Maxwell done clear
  C)
  Oersted              done clear
  D)
  Thomson done clear
  E)
  None of these  done clear
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• question_answer29)
  In the given figure a solenoid wound on a core of soft iron. Will the end X be a north pole or south pole when the current flows in the direction shown? Change the direction of flow of current.  
  A)
  North                done clear
  B)
  South done clear
  C)
  South-North                   done clear
  D)
  North-South done clear
  E)
  None of these done clear
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• question_answer30)
  Which of the following is incorrect match?
  A)
  Manganin - Cu, Mn, Ni done clear
  B)
  Constantan - Cu and Sn done clear
  C)
  Nichrome - Ni, Cr, Mn and iron done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer31)
  The ____ is the basis of MRL
  A)
  Resistance                      done clear
  B)
  Bones in the body done clear
  C)
  Magnetism         done clear
  D)
  Pressure done clear
  E)
  None of these done clear
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• question_answer32)
  The function of commutator in an e]ectr5c motor is to:
  A)
  Make contact with the rotation rings. done clear
  B)
  Reverse the direction of current flowing through the coil. done clear
  C)
  Supply current to the coil done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer33)
  Which of the following is represented by the forefinger of our hand in Fleming's left-hand rule?
  A)
  The direction of current done clear
  B)
  The direction of magnetic field done clear
  C)
  The direction of force done clear
  D)
  The direction of pressure done clear
  E)
  None of these done clear
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• question_answer34)
  The largest force experienced by a current carrying conductor placed in a magnetic field is when the angle between the conductor and the magnetic field is:
  A)
  \[30{}^\circ \]                           done clear
  B)
  \[45{}^\circ \] done clear
  C)
  \[90{}^\circ \]               done clear
  D)
  \[60{}^\circ \] done clear
  E)
  None of these done clear
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• question_answer35)
  An electric motor converts:
  A)
  Heat energy into electrical energy done clear
  B)
  Electrical energy into mechanical energy done clear
  C)
  Mechanical energy into electrical energy done clear
  D)
  Electrical energy into heat energy done clear
  E)
  None of these done clear
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• question_answer36)
  Which way does the wire in the diagram below tend to move?
  A)
  Downward done clear
  B)
  Upward    done clear
  C)
  Towards left                   done clear
  D)
  Towards right done clear
  E)
  None of these done clear
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• question_answer37)
  Which of the following statements is correct?
  A)
  A fuse wire has high melting point. done clear
  B)
  Thickness of the fuse wire does not depend on the current flowing through the circuit. done clear
  C)
  A fuse wire is connected in parallel in the electric circuits. done clear
  D)
  A fuse wire is connected in series in the electric circuits. done clear
  E)
  None of these done clear
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• question_answer38)
  In which of the following cases the resistance of a wire gets halved?
  A)
  When the length of a wire is doubled. done clear
  B)
  When the area of cross - section of a wire is doubled. done clear
  C)
  When the current gets halved. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer39)
  The current flowing in the given circuit diagram is:
  A)
  1.34 ampere done clear
  B)
  2.4 ampere done clear
  C)
  1.8 ampere                    done clear
  D)
  2.9 ampere done clear
  E)
  None of these done clear
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• question_answer40)
  The strength of magnetic field produced by a current carrying solenoid does not depend on the:
  A)
  Number of turns in the solenoid. done clear
  B)
  Strength of current in the solenoid. done clear
  C)
  Nature of "core material" used in making solenoid. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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