Free Printable C10 MAGNETIC EFFECT OF ELECTRIC CURRENT

1.

1. The magnetic effect of electric current was first discovered by:

a)

(a) Alexander Flemming

b)

(b) Oersted

c)

(c) Ampere

d)

(d) Maxwell

2.

2. Which of the following correctly describes the magnetic field near a straight wire carrying current:

a)

(a) The field is uniform

b)

(b) The field is non-uniform

c)

(c) The field consists of concentric circles centered on the wire

d)

(d) None of these

3.

3. The magnetic field inside a long straight solenoid carrying current is:

a)

(a)The same at all points

b)

b)Increases as we move towards its ends

c)

(c)Decreases as we move towards its ends

d)

(d)Zero

4.

4. The direction of magnetic field lines due to a straight current carrying conductor B is given by:

a)

(a)Maxwell's right-handed screw rule

b)

(b) Ohm's law

c)

(c)Coulomb's law

d)

(d) None of these

5.

5. The adjoining figure represents the magnetic field caused by a current-carrying conductor which is:

a)

(a)A long straight wire

b)

(b) A circular coil

c)

(c) A solenoid

d)

(d) A short straight wire

6.

. 6.The intensity of magnetic field between the poles of an electromagnet would be unchanged, if:

a)

(a)Current in the electromagnet coil is doubled

b)

(b)Distance between the poles of electromagnet is halved

c)

(c) Direction of current in the electromagnet coil is reversed

d)

(d)Material of its core is changed.

7.

7. The North-South polarities of an electromagnet can be determined easily by using:

a)

(a) Fleming’s right hand rule

b)

(b)Clock face rule

c)

(c) Right-hand screw rule

d)

(d) None of these

8.

8. If the direction of current in a coil at its one face is anti-clockwise this end of coil will be:

a)

(a) South pole

b)

(b) North pole

c)

(c)Both (a) and (b)

d)

(d) None of these

9.

9. The direction of electric current in a solenoid when seen from a particular end is clockwise, then this end of the solenoid will be:

a)

(a) West pole

b)

(b) South pole

c)

(c)North pole

d)

(d) East pole

10.

10. Which of the following substance is used to make an electromagnet:

a)

(a) Aluminium

b)

(b) Copper

c)

(c) Soft iron

d)

(d) Steel

11.

11. A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:

a)

(a) Will remain unchanged

b)

(b) Will increase

c)

(c) Will decrease

d)

(d) None of these

12.

12. The magnetic field inside a solenoid carrying current is almost:

a)

(a)Non-uniform

b)

(b) Uniform

c)

(c) Both (a) and (b)

d)

(d) None of these

13.

13. If the number of turns in a coil is increased then the magnetic field produced by it will:

a)

(a)Increase

b)

(b) Decrease

c)

(c) Remains unchanged

d)

(d) None of these

14.

14.The front face of a circular coil carrying current behaves like a North pole. The direction of current in the face of the circular coil is:

a)

(a)Anti-clockwise

b)

(b)Clockwise

c)

(c)Downwards

d)

(d)Upwards.

15.

15. The S.I. unit of magnetic field is:

a)

(a)Tesla

b)

(b) Volt

c)

(c)Ampere

d)

(c)Ampere

16.

16. The magnetic lines of force in the middle of the current carrying solenoid are:

a)

(a) Circles

b)

(b) Parallel to the axis of solenoid

c)

(c) Spirals

d)

(d) Perpendicular to the axis of solenoid.

17.

17. In a uniform magnetic field the field, lines are:

a)

(a)Concentric circles

b)

(b)Parallel lines

c)

(c) Non-parallel lines

d)

(d)None of these.

18.

18. In a non-uniform magnetic field the field lines are:

a)

(a)Parallel lines

b)

(b)Non-parallel lines

c)

(c) Spiral

d)

(d) None of these

19.

19. The substance used to make permanent magnet is:

a)

(a) Copper

b)

(b) Aluminium

c)

(c) Alnico

d)

(d) None of these

20.

20. Which of the property a proton can change, when it moves freely in a magnetic field:

a)

(a)Charge

b)

(b)Velocity

c)

(c)Mass

d)

(d)None of these

21.

21. The force on a conductor carrying current in a magnetic field is kept perpendicular to the field. The force acting on it will be:

a)

(a)Zero

b)

(b)Maximum

c)

(c)Average

d)

(d)None of these

22.

22. A current carrying conductor is placed parallel to the magnetic field. The force acting on it will be:

a)

(a)Maximum

b)

(b)Zero

c)

(c)Nothing can be said

d)

(d)All of these

23.

23. An electron beam enters a magnetic field at right angles to it as shown in figure:

a)

(a)To the left

b)

(b)To the right

c)

(c)Into the plane of paper

d)

(d)Out of the plane of paper

24.

24. The force exerted on a current carrying wire placed in a magnetic field is 0 when angle between the wire and the direction of magnetic field is:

a)

(a)30˚

b)

(b)180˚

c)

(c)60˚

d)

(d)90˚

25.

25. A magnetic field does not exert a force on:

a)

(a)An electric charge moving perpendicular to the field

b)

(b)An iron bar

c)

(c)A stationary charge

d)

(d)A magnetic needle

26.

26. The direction of force on a current carrying conductor is given by:

a)

(a)Ampere`s swimming rule

b)

(b)Right handed screw rule

c)

(c)Coulomb`s law

d)

(d)Fleming`s left hand rule

27.

27. The D.C. motor works on the principle of:

(a)Heating effect of current (b)Chemical effect of current

(c)Magnetic effect of current (d)None of these

a)

(a)Heating effect of current

b)

(b)Chemical effect of current

c)

(c)Magnetic effect of current

d)

(d)None of these

28.

28. To change the direction of current in the armature, following device is used:

a)

(a)Pole pieces

b)

(b)Carbon brushes

c)

(c)Battery

d)

(d)Split ring or commutator

29.

29. An electric motor is a device which transforms:

a)

(a)Mechanical energy into electrical energy

b)

(b)Heat energy into electrical energy

c)

(c)Electrical energy into heat energy

d)

(d)Electrical energy into mechanical energy

30.

30. The magnetic lines of force produced by a bar magnet:

a)

(a)Originate from North pole and end at infinity

b)

(b)Originate from North pole and ends at its South pole

c)

(c)Originate from South pole and end at North pole

d)

(d)Originate from South pole and ends at its West pole

31.

31. Which of the following is attracted by a magnet:

a)

(a)Iron

b)

(b)Brass

c)

(c)Copper

d)

(d)Aluminium

32.

32. Which of the following is not attracted by a magnet:

a)

(a)Iron

b)

(b)Nickle

c)

(c)Cobalt

d)

(d) Brass

33.

33. The axis of Earth`s magnet field is inclined with geographical axis at an angle of about:

a)

(a)25˚

b)

(b)5˚

c)

(c)15˚

d)

(d)45˚

34.

34. The sure test of magnetism is:

a)

(a)Attraction

b)

(b)Repulsion

c)

(c)Both (a) and (b)

d)

(d)None of these

35.

35. The magnetic field lines:

a)

(a)Intersect each other

b)

(b)Do not intersect each other

c)

(c)Intersect at right angle

d)

(d)None of these

36.

36. The S.I. unit of magnetic field is:

a)

(a)Ampere

b)

(b) Volt

c)

(c) Tesla

d)

(d)Newton

37.

37. In a uniform magnetic field the field lines are:

a)

(a)Parallel to each other

b)

(b)Non parallel

c)

(c)Both (a) and (b)

d)

(d) None of these

38.

38. In a non-uniform magnetic field the lines of force are:

a)

(a)Circular

b)

(b)Parallel to each other

c)

(c)Non parallel

d)

(d)None of these

39.

39. The North pole of Earth`s magnetic field is in the:

a)

(a)Geographical South

b)

(b) Geographical East

c)

(c) Geographical West

d)

(d) Geographical North

40.

40. The phenomenon of electromagnetic induction is:

a)

(a) The process of charging a body

b)

(b) The process of generating magnetic field due to current passing through the coil

c)

(c) Producing induced current in a coil due to relative motion between a magnet and a coil

d)

(d) The process of rotating a coil of an electric motor

41.

41. In the process of electromagnetic induction:

a)

(a) Mechanical work is transformed in the form of electrical energy

b)

(b) Chemical energy is converted in the form of electrical energy

c)

(c) Electrical energy is transformed in the form of mechanical work

d)

(d) Electrical energy is transformed in the mechanical energy

42.

42. The process of electromagnetic Induction was first discovered by:

a)

(a) Maxwell

b)

(b) Ampere

c)

(c) Oersted

d)

(d) Michael Faraday

43.

43. The direction of induced current is determined by:

a)

(a) Fleming's left hand rule

b)

(b) Fleming's right hand rule

c)

(c) Corkscrew rule

d)

(d) None of these

44.

44. A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each:

a)

(a) Two revolutions

b)

(b) One revolution

c)

(c) Half revolution

d)

(d) One-fourth revolution.

45.

45. A galvanometer is a device which is used to:

a)

(a) Detect the current in the circuit

b)

(b) Measure potential difference between two points

c)

(c) Measure emf of a cell

d)

(d) None of these

46.

46. The device used for producing electric current is called a:

a)

(a) Generator

b)

(b) Galvanometer

c)

(c) Ammeter

d)

(d) Motor.

47.

47. The essential difference between an A.C. generator and a D.C. generator is that:

a)

(a) A.C. generator has an electromagnet while a D.C. generator has a permanent magnet

b)

(b) D.C. generator will generate a higher voltage

c)

(c) A.C. generator will generate a higher voltage

d)

(d) A.C. generator has slip rings while the D.C. generator has a commutator.

48.

48. The frequency of A.C. in India is:

a)

(a) 25 Hz

b)

(b) 50 Hz

c)

(c) 75 Hz

d)

(d) 100 Hz.

49.

49. The frequency of D.C. is:

a)

(a) 0 Hz

b)

(b) 100 Hz

c)

(c) 50 Hz

d)

(d) 60 Hz.

50.

50. The D.C. generator is based on the principle of:

a)

(a) Electrostatic induction

b)

(b) Electromagnetic induction

c)

(c) Electrochemical induction

d)

(d) None of these.

51.

51. An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on the:

a)

(a) Speed of magnet with which it moves

b)

(b) Number of turns in the coil

c)

(c) Resistivity of the wire used in coil.

d)

(d) The intensity of magnetic field in which coil is moved

52.

52. When the switch S is closed in fig. given below, the pointer of the galvanometer moves to the right:

If S is kept closed, will the pointer :

a)

(a) Return to zero

b)

(b) Stay over on the right

c)

(c) Move to the left and stay there

d)

(d) Move to and fro until S is opened.

53.

53. The production of electricity from magnetism is called:

a)

(a) Electrostatic induction

b)

(b) Electromagnetic induction

c)

(c) Current electricity

d)

(d) None of these.

54.

54. The North pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the North pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:

a)

(a) Moving towards the solenoid

b)

(b) Moving into solenoid

c)

(c) At rest inside the solenoid

d)

(d) Moving out of the solenoid.

55.

55. In the domestic electric circuit, which of the following arrangement is used

a)

(a) Series arrangement

b)

(b) Parallel arrangement

c)

(c) Both (a) and (b)

d)

(d) None of these.

56.

56. The colour of insulation of live wire is:

a)

(a) Red

b)

(b) Green

c)

(c) Black

d)

(d) Grey

57.

57. The colour of insulation of neutral wire is:

a)

(a) Red

b)

(b)Black

c)

(c) Green

d)

(d) Yellow.

58.

58. The colour of insulation of earth wire is:

a)

(a) Green

b)

(b) Red

c)

(c) White

d)

(c) White

59.

59. Electric fuse is made of:

a)

(a) Iron

b)

(b) Copper

c)

(c) Tin-lead alloy

d)

(d) None of these.

60.

60. At the time of short circuiting the current in the circuit:

a)

(a) Reduces substantially

b)

(b) Does not change

c)

(c) Increase heavily

d)

(d) Vary continuously.

61.

61. Current rating of a fuse wire in a circuit having bulb and tubes is:

a)

(a)2 A

b)

(b) 3 A

c)

(c) 4 A

d)

(d) 5 A

62.

62. Current rating of a fuse wire in a circuit having heating appliances is:

a)

(a) 15 A

b)

(b)12 A

c)

(c) 8 A

d)

(d)5A

63.

63. Electric fuse is made of material of:

a)

(a) Low melting point

b)

(b) High melting point

c)

(c) Low resistance

d)

(d) None of these.

C10 MAGNETIC EFFECT OF ELECTRIC CURRENT

Total questions: 63

Worksheet time: 21mins

Similar Resources on Wayground