10th Class Science Magnetic Effects of Electric Current Question Bank

done Magnetic Effects of Electric Current Total Questions - 20

• question_answer1)
  Two current-conducting wires are hung on a plastic rod. A large current is passed through the two wires in the direction shown. Which of the following options is correct regarding this?

  (i) I and III parts of wire repel each other.

  (ii) II and IV parts of wire repel each other.

  (iii) I and IV parts of wire repel each other.

  (iv) II and III parts of wire repel each other.

   
  A)
  Only (i) and (ii)            done clear
  B)
  Only (i) and (iii)           done clear
  C)
  Only (iii) and (iv)         done clear
  D)
  Only (i) and (iv) done clear
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• question_answer2)
  A straight current carrying conductor is kept along the axis of circular loop carrying current. The force exerted by the straight conductor on the loop is
  A)
  Perpendicular to the plane of the loop done clear
  B)
  In the plane of the loop, away from the center done clear
  C)
  In the plane of the loop, towards the center done clear
  D)
  Zero done clear
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• question_answer3)
  X and Yare wires carrying electric currents which are perpendicular to the page and A, B and C are the three compasses as shown in figure. Which of the following statements is correct regarding magnitude and direction current?
  A)
  Direction of current is same and its magnitude is larger in X than in Y. done clear
  B)
  Direction of current is opposite and its magnitude is smaller in X than in Y. done clear
  C)
  Direction of current is opposite and its magnitude is larger in X than in Y. done clear
  D)
  Direction of current and its magnitude is same in both X and Y. done clear
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• question_answer4)
  A small conducting rod of length \[l,\] moves with a uniform velocity v in a uniform magnetic field B as shown in figure,
  A)
  The end X of the rod becomes positively charged. done clear
  B)
  The end Y of the rod becomes positively charged. done clear
  C)
  The entire rod is unerringly charged. done clear
  D)
  The rod becomes hot due to joule heating. done clear
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• question_answer5)
  Consider the following statements and select the correct option which correctly identifies true (T) and false (F).

  (i) Magnetic field lines do not intersect because they always travel parallel to each other in North to South direction.

  (ii) When a current flows through a straight copper conductor, it gets permanently magnetized.

  (iii) The strength of magnetic field at the centre of a circular coil is inversely proportional to the radius of coil.

   
  A)

  (i)	(ii)	(iii)
  T	T	F

    done clear
  B)

  (i)	(ii)	(iii)
  T	F	T

    done clear
  C)

  (i)	(ii)	(iii)
  F	F	T

    done clear
  D)

  (i)	(ii)	(iii)
  F	T	F

    done clear
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• question_answer6)
  Current is passed through the circular loop as shown in figure. What is the direction of magnetic field at X and Y?
  A)
  Clockwise at both X and Y done clear
  B)
  Anticlockwise at both X and Y done clear
  C)
  Clockwise at X and anticlockwise at Y done clear
  D)
  Anticlockwise at X and clockwise at Y done clear
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• question_answer7)
  A straight wire is placed between two poles of a magnet as shown in figure. If an alternating current passing through a wire then wire will
  A)
  Move into the page only done clear
  B)
  Move out of the page only done clear
  C)
  Move out and into the page done clear
  D)
  Remain stationary done clear
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• question_answer8)

  A wire is placed between the magnetic poles as shown in figure.

  In which direction does a force act on the wire?

     
  A)
  Vertically downward on the wire done clear
  B)
  Vertically upward on the wire done clear
  C)
  Towards east to west done clear
  D)
  Towards west to east done clear
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• question_answer9)
  Consider the arrangements shown in figure in which the North pole of a magnet is moved away from a thick conducting loop containing capacitor. Then excess positive charge will arrive on
  A)
  Plate a done clear
  B)
  Plate b done clear
  C)
  Both plates a and b done clear
  D)
  Neither plate a nor b. done clear
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• question_answer10)
  An electric current passes through a straight wire. Magnetic compasses are placed at the points X and Y.
  A)
  Their needles will not deflect. done clear
  B)
  Only one of the needles will deflect. done clear
  C)
  The needles will deflect in the same direction. done clear
  D)
  The needles will deflect in the opposite directions. done clear
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• question_answer11)
  Match the column I with column II and select the correct option from the codes given below.

  Column I	Column II
  Right hand thumb rule magnetic induction	(i) Application of electromagnetic induction
  Fleming?s right hand rule	(ii) Direction of magnetic field due to current in wire
  Current carrying solenoid	(iii) Similar to bar magnet
  Electric generator	(iv) Direction of induced current

  A)
  (a) - (i), (b) - (iii), (c) - (iv), (d) - (ii) done clear
  B)
  (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i) done clear
  C)
  (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) done clear
  D)
   (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv) done clear
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• question_answer12)
  Direction: Read the passage carefully and answer the following questions. Three specimens of magnetic material were tested using the apparatus shown in the diagram. When the switch is closed, the specimen picks up some of the iron nails but when the switch is opened, many or most of the nails fall off. The number of nails picked up and left on were found for three specimens. The table shows the results.          

  Specimen	Number of nails picked up	Number of nails retained by the specimen
  X	35	4
  Y	20	10
  Z	40	3

  Which material is the best electromagnet among the three?
  A)
  X                                  done clear
  B)
  Y                      done clear
  C)
         Z                      done clear
  D)
         All of these. done clear
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• question_answer13)
  Direction: Read the passage carefully and answer the following questions. Three specimens of magnetic material were tested using the apparatus shown in the diagram. When the switch is closed, the specimen picks up some of the iron nails but when the switch is opened, many or most of the nails fall off. The number of nails picked up and left on were found for three specimens. The table shows the results.          

  Specimen	Number of nails picked up	Number of nails retained by the specimen
  X	35	4
  Y	20	10
  Z	40	3

  What does the number of nails left on the material indicate?
  A)
  Ability to retain magnetism when current is removed. done clear
  B)
  Ability to induce e.m.f. done clear
  C)
  To undergo magnetostriction on removal of current. done clear
  D)
  Ability to change strength of magnetic field. done clear
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• question_answer14)

  Direction: Read the passage carefully and answer the following question.

  In the given diagram, when the magnet is pushed into the solenoid, the pointer of the galvanometer deflects slightly to the left.

  Which of the following changes would cause the pointer to deflect through a larger angle?
  A)
  Move the magnet faster. done clear
  B)
  Move the magnet away from the solenoid. done clear
  C)
  Unwind some of the turns of the solenoid. done clear
  D)
  Keep the magnet stationary. done clear
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• question_answer15)

  Direction: Read the passage carefully and answer the following question.

  In the given diagram, when the magnet is pushed into the solenoid, the pointer of the galvanometer deflects slightly to the left.

  Which of the following would produce a deflection of the pointer towards the right?
  A)
  Move the solenoid towards the magnet. done clear
  B)
  Move the solenoid away from the magnet. done clear
  C)
  Move the magnet faster into the solenoid. done clear
  D)
  By placing the magnet above the coil. done clear
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• question_answer16)
  Two long parallel conductors I are II placed at right angles to a metre scale, at the 2 cm and 6 cm marks, as shown. They carry currents of 1 A and 3 A respectively in same direction. They will produce zero magnetic field at the
  A)
  Zero mark done clear
  B)
  10 cm mark done clear
  C)
  3 cm mark done clear
  D)
  6 cm mark. done clear
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• question_answer17)
  Three closed similar coils P, Q and R are placed such that their planes are parallel. In the coil P and R, current of same magnitude flows as shown in the figure. Coils Q and R are static while coil P is moved with a uniform speed towards Q, then
  A)
  Clockwise current will be induced in coil Q, as seen by eye done clear
  B)
  Anti-clockwise current will be induced in coil Q, as seen by eye. done clear
  C)
  No current will flow in coil Q done clear
  D)
  Current induced in coil Q will be equal to P and R, but in opposite direction, hence net current in Q will be zero. done clear
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• question_answer18)
  The variation of induced emf (e) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as
  A)
                                      done clear
  B)
  done clear
  C)
                     done clear
  D)
                                 done clear
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• question_answer19)
                         

  Direction: Read the passage carefully and answer following question. A simple a.c. generator produces an alternating emf as shown in figure (i).

  If the speed of the generator is changed then the graph of the new output is shown in figure

  What change does occur in the speed of the coil in the generator?
  A)
  It is halved. done clear
  B)
  It is doubled. done clear
  C)
  It is one fourth. done clear
  D)
  It is four times. done clear
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• question_answer20)

  Direction: Read the passage carefully and answer following question. A simple a.c. generator produces an alternating emf as shown in figure (i).

  If the speed of the generator is changed then the graph of the new output is shown in figure

  In which graph the frequency of the alternating emf is higher?
  A)
  In graph (i) done clear
  B)
  In graph (ii) done clear
  C)
  In both the graphs the frequency is same. done clear
  D)
  Data is insufficient. done clear
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